Midian Electronics TRC-2 User manual

1
TRC-2
F1 and F2 Tone Remote Controller
Manual Revision: 2012-07-27
Covers TRC Firmware Revisions:
1.22 & Higher
Covers Keyboard Firmware Revisions:
3.2 & Higher
Covers Encoder/Decoder Firmware Revisions:
1.7 & Higher
Covers PCB Revisions:
G & Higher

2
TABLE OF CONTENTS
Specifications 3
General Information 4
Hardware Installation 5
Hardware Alignment 7
Jumper Settings 8
Controls & Indicators 9
Operation 10
Theory of Operation 11
Technical Notes 13
Contact Information 13

3
SPECIFICATIONS
Voltage/Current:
Operating Voltage: 18 VDC
Operating Current (standby): 170 mA
Operating Current (RX): 310 mA
Operating Current (TX): 170 mA
RX Inputs:
Input Impedance (RX): 600 Ohms
Compression Threshold: Adjustable to –20 dbm
Compression Range: Not more than 3 db change for 30 db increase above threshold
Speaker Audio Output: 2.0 Watt
Distortion: Less than 3% at full audio
Hum & Noise: 50 db below normal operating level
Frequency Response: Less than 3 db from 300 Hz-3 KHz
Notch Filter Depth: 45 db relative to 1 KHz below compression
TX Outputs:
TX Output: Adjustable to +15 dbm on 2175 Hz
Output Impedance (TX): 600 Ohms
Mic Compression Threshold: Adjustable typically 50 mv
Compression Range: Not more than 3 db change for 30 db increase above threshold
Hum & Noise: 50 db below normal operating level
Notch Filter Depth: 45 db relative to 1 KHz below compression
Mechanical:
Dimensions: 2.875" H x 6.5” W x 8.75" L
Operating Temp: -30° to +60° C
Default Control Tone Frequencies & Timing:
Function Tone Frequency Level & Duration
High-Level Guard 2175 Hz 10 dBm for 120 msec
Low-Level Guard 2175 Hz -20 dBm continuous
Monitor 2050 Hz 0 dBm for 40 msec
F1 1950 Hz 0 dBm for 40 msec
F2 1850 Hz 0 dBm for 40 msec
Encode Formats:
Optional DTMF (0-9, *, #)

4
GENERAL INFORMATION
Midian’s TRC-2 is a basic tone remote controller for F1 and F2 selection with optional DTMF dialing. The TRC
uses EIA and Industry standards for monitor, guard, and F1-F2 function tones. The TRC comes standard with an
internal microphone and speaker. A gooseneck microphone (TRC Option A) or handset and cradle (TRC Option
C) are also available. The standard configuration is for a 2-wire and single line system. A 4-wire option (TRC
Option F) or a Line 2 option (TRC Option E) is available for these types of systems.
Midian’s TRC can be used with Midian’s TTC series tone remote adaptor, or another manufacturer’s tone remote
adaptor that uses EIA and industry standard F1-F2 function tones.

5
HARDWARE INSTALLATION
Be certain to follow standard anti-static procedures when handling any of Midian’s products.
Getting Started:
The TRC has a number of adjustment potentiometers and configuration jumpers. These have been adjusted and
configured at the factory for a typical installation. However, audio levels should be verified and adjusted (if
necessary) at the time of installation. Also, the configuration jumpers should be inspected prior to installation to
verify that they are in the right configuration. Jumper descriptions appear in the jumper settings section with a
quick reference table. NOTE: The Zener Diode D-605 is installed to reduce the input voltage to regulators U601
and U602. D-605 is operating within specifications however when the TRC is open for adjustment, care should be
used to avoid touching the diode as it can be hot to the touch.
Line Interface
The line interface connector PL1 is a 10-pin RJ-45 style connector in the center of the back panel. A standard 4-
pin RJ-11 cable will plug into the RJ-45 and connect to the center 4-pins that are needed for 2-wire or 4-wire
interfaces. The remaining 6 pins are for use with a telemetry radio or microwave E&M options and for future
interoperability options.
2-Wire & Line 1 Operation: For a single line, 2-wire installation, simply connect pins 5 and 6 (red and green) to
the dedicated line. This is the standard configuration for the TRC. See table 3.1.
Table 3.1
Pin Color 2-Wire
PL1-4 Black Not Used
PL1-5 Red Line 1
PL1-6 Green Line 1
PL1-7 Yellow Not Used
2-Wire with Line 1 & 2 Operation: For a 2-line, 2-wire installation connect pins 5 and 6 (red and green) for line 1
and pins 4 and 7 (black and yellow) for line 2. For this feature TRC Option E must be installed in the TRC.
Remove JP202 and JP203 for proper operation. See table 3.2. Please note that the 4-Wire Option (TRC Option
F) is not available in Line 2 operation.
Table 3.2
Pin Color 2-Wire
PL1-4 Black Line 2
PL1-5 Red Line 1
PL1-6 Green Line 1
PL1-7 Yellow Line 2
Diagram 3.1
1

6
4-Wire & Line 1 Operation: For a single line 4-wire installation, connect pins 4 and 7 (black and yellow) for
receive audio and pins 5 and 6 (red and green) for transmit audio. For this feature TRC Option F must be installed
in the TRC. JP204 should be moved to the 3-4 position. See table 3.3. Please note that the Line 2/Supervisor
Option (TRC Option E) is not available in 4-wire operation.
Table 3.3
Pin Color 4-Wire
PL1-4 Black RX
PL1-5 Red TX
PL1-6 Green TX
PL1-7 Yellow RX
Parallel Remote Operation: When multiple remotes are connected to a single dedicate phone line JP304 must
be installed in the unit furthest from the phone line connection. All remaining units must have JP304 removed.
Diagram 3.2 – Parallel Remote Wiring
Supervisor Operation: When using the supervisor option (TRC Option E), the supervisor TRC is connected to
the line via pins 2 and 3. The remaining TRC’s pins 5 and 6 are connected in parallel to the supervisor’s TRC pins
4 and 7. To enable these remotes, the supervisor relay must be engaged by pressing the * and # keys
simultaneously.
Diagram 3.3 – Supervisor Wiring
Telemetry Radio: Rather than connecting the TRC to a dedicated line to communicate with the tone remote
adaptor, telemetry radios can be used for communication. If connecting to a telemetry radio connect PL1 as
follows to the radio:
PL1-3: PTT Output: Connect to the PTT of the radio. Jumpers JP210 1-2 and JP208 1-2 should be installed.
PL1-6: TX Audio Output: Connect to the mic-hi input of the radio. Install JP205 2-3.
PL1-7: RX Audio Input: Connect to a point in the radio providing flat receive audio. Install JP11 1-2 & remove
JP204.
PL1-9: Battery: 15 volts through a 100 Ohm current limiting resistor (R216).
PL1-10: Ground: Connect to the ground of the radio.
Microwave: Connect the 4-wire audio to the TX and RX sides of the microwave. If the M lead is desired install
JP208 1-2 and JP10 1-2. Connect the microwave’s M lead to PL1 Pin 3 for an open collector to ground. If using
an external relay to control the microwave’s M lead you may use Q205 to provide 12 volts and install JP207 1-2
and JP208 2-3.
PL1-8: External Speaker or PA System
5
TRC
65
TRC
6 5
TRC
6
To Tone
Remote
Adaptor
JP304
Out JP304 Out JP304 In
To Tone
Remote
Adaptor 66
7
4
5
TRC
5 TRC
6 5
TRC
Supervisor

7
HARDWARE ALIGNMENT
The following procedures assume a good quality dedicated line is being used and the tone remote adaptor is already
installed. The alignments are preset at the factory and should not need to be adjusted during installation. However, if an
adjustment is needed please follow the procedures below.
RX Input Line Level Adjustment:
1. With the dedicated line connected to the TRC, connect a line level meter to the red and green (or yellow & black
with the 4-wire option) in bridging mode. If testing on a bench with no tone remote adaptor available use termination
mode on the line level meter.
2. With the line level meter generating Low-Level Guard Tone at -20 dBm, monitor TP304 with an oscilloscope.
3. Adjust RP306, so that 200 mV p-p is seen at TP304 or 165 mV p-p is seen at TP301. If paralleling multiple remotes,
this alignment should be done with all remotes attached.
TX Output Line Level Adjustment:
1. With the dedicated line connected to the TRC, connect a line level meter to the red and green in bridging mode. If
testing on a bench with no tone remote adaptor available use termination mode on the line level meter.
2. Set RP201 to 90%.
3. Push and hold the SEND key on the TRC to generate the Low-Level Guard Tone.
4. Adjust RP202 so that the line level meter shows the Low-Level Guard Tone at -20 dBm. If paralleling multiple
remotes, this alignment should be done with all remotes attached.
RX Notch Filter Alignment:
1. Generate the 2175 Hz Low-Level Guard Tone to the TRC.
2. Turn RP303 fully clockwise.
3. Monitor TP303 with a Sinadder. The sensitivity of the Sinadder should be adjusted to hear the tone.
4. Adjust RP302 until the tone is at it’s most diminished point.
5. Adjust RP303 until the tone fully diminishes.
6. Repeat steps 4 and 5 until no tone remains.
TX Notch Filter Alignment:
1. Unplug the internal microphone from the TRC, install JP101 1-2 and turn RP102 fully clockwise.
2. Push and hold the SEND key on the TRC to generate the 2175 Hz Low-Level Guard Tone.
3. Monitor TP103 with a Sinadder. The sensitivity of the Sinadder should be adjusted to hear the tone.
4. Adjust RP103 until the tone is at it’s most diminished point.
5. Adjust RP102 until the tone fully diminishes.
6. Repeat steps 4 and 5 until no tone remains.
7. After aligning the TX notch filter, remove JP101 and plug back in the internal or gooseneck microphone.
Handset Ear Level (TRC Option C Only):
1. With a field radio talking on channel to the TRC, adjust RP304 to a comfortable level.

8
JUMPER SETTINGS
The following table shows the default jumper settings and their function:
Jumper
Number Default Position Description
JP101 Out Install during TX Notch Filter Alignment only
JP201 Out Sidetone for optional DTMF dialing (4-wire option only)
JP202 In Removed when TRC Option E is installed (Line 2/Supervisor)
JP203 In Removed when TRC Option E is installed (Line 2/Supervisor)
JP204 1-2 In – 3-4 Out 2-wire (1-2 In 3-4 Out) or 4-wire option (1-2 Out 3-4 In)
JP205 1-2 In – 2-3 Out Balanced (1-2 In 2-3 Out)/Unbalanced (1-2 Out 2-3 In) Audio
Selection for use with a telemetry radio instead of a dedicated line.
JP206 Out Power with current limit.
JP207 Out Activates Q205 to provide 14 V to external M lead relay.
JP208 Out If JP208 1-2 is installed with JP210 1-2, provides an open-collector
to ground on PL1-3 to PTT a telemetry radio or ground a relay for
an M lead.
JP209 In Always installed unless directed otherwise by Midian.
JP210 1-2 Out – 2-3 Out Install JP210 1-2 with JP208 1-2 to PTT a telemetry radio.
JP301 1-2 In – 2-3 Out Future Use
JP302 Out Handset Audio Feedback. Install only with the TRC Option C if dial
tones and voice in the ear piece are desired.
JP303 Out TX Audio Loading. If less TX audio is needed, install this jumper.
JP304 In 2-Wire RX Audio Termination. If more RX audio is needed, remove
this jumper. This should only be needed if paralleling remotes.
JP305 Out 4-wire option only. RX Audio Loading. If less RX audio is needed,
install this jumper.
JP306 Out 4-wire option only. RX Audio Termination. If more RX audio is
needed, remove this jumper. This should only be needed if
paralleling remotes.
JP307 1-2 Out – 2-3 In With 2-3 installed the volume control switch is the main source of
controlling the handset ear piece audio level. With 1-2 installed and
2-3 removed, the volume control switch does not affect the handset
ear piece audio level and RP304 is the only source of control.
JP308 Out Low impedance audio for external speaker or PA System.
JP309 In Leave In: In for hard mute and out for soft mute
JP401 Out Factory Use Only
JP409 Out Factory Use Only

9
CONTROLS & INDICATORS
Power/Volume Switch: On the right side of the TRC, there is a switch which acts as the power and volume
switch. The switch is in the power off position when turned fully clockwise past the click. Turning the switch
counter-clockwise past the click turns the power on to the volume control. At this point the volume is in the low
position. Turning the switch further counter-clockwise increases the volume.
LED 1 (PWR - LINE/SUP): This LED is a bi-color LED. The LED will glow red when the power is on to the TRC. It
glows orange when Line 2/Supervisor mode is active.
LED 2 (SEND - F1/F2): This LED is a tri-color LED. The LED will glow red during transmit of Freq 1 and orange
during transmit of Freq 2. It glows green when Guard Tone is detected from a parallel tone remote.
FREQ: The FREQ button acts as the frequency select key. Pressing this key once will give a single beep to
indicate F1. Pressing this key again will give a double beep to indicate F2.
INTER: Pressing the INTER key will allow intercom communications between several connected tone remotes
without transmitting over the radio. When the INTER key is pressed and held, the audio is routed on the line
without the Guard Tone activating the transmitter. Other tone remotes on the same line will hear the audio
automatically. No cross mute is available in intercom mode since there is no Guard Tone present.
MONITOR: Pressing the MONITOR key will allow the user to monitor the channel before pressing the SEND key
to make a call. If a conversation is heard then another co-channel user presently “owns” the channel and should
not be interrupted.
SEND: Pressing SEND will transmit the high-level guard tone for 120 msec, followed by the frequency tone for 40
msec, followed by the low-level guard tone that keys the radio with the voice and dialing riding over the low-level
continuous tone.
Optional 0-9, *, # Keys: These keys are used to dial DTMF. Press the desired buttons followed by the SEND key
transmits the DTMF.
1 ABC 2 DEF 3
GHI
4 JKL 5 MNO 6
PQRS
7 TUV 8 WXYZ 9
MENU
* OPER 0 CLR #
FREQ INTER
MONITOR
SEND
PWR - LINE/SUP SEND - F1/F2

10
OPERATION
F1/F2Selection: To change the channel of the radio (F1 or F2), pressing the FREQ button once will give a single
beep to indicate F1. Pressing this key again will give a double beep to indicate F2.
Transmitting: After selecting the desired Function Tone for frequency selection, pressing and holding the SEND
key will generate the High-Level Guard Tone followed by the continuous Low-Level Guard Tone. The user speaks
into the microphone of the TRC and the voice goes out over the Low-Level Guard Tone.
Monitor: Prior to transmitting or dialing, the user should Monitor the channel to see if there is activity on the
channel. If there is activity, the user should wait until the channel is clear. Pressing the MONITOR button sends
the High-Level Guard Tone followed by the Monitor Function Tone to the tone remote adaptor giving it a
command to open the squelch of the radio. Depending on the tone remote adaptor this can be momentary or
latched. If momentary, the tone remote adaptor will close the squelch of the radio after a set amount of time. If
latched, the squelch will remain open until the tone remote adaptor receives a second Monitor command from the
TRC.
Receiving: When a field radio keys up, the tone remote adaptor passes the voice down the line to the TRC. The
voice will then be passed through to the internal speaker of the TRC.
Optional Line 2/Supervisor Capability (FREQ + INTER): If the TRC is ordered with TRC Option E, then the
TRC is equipped with the Line 2/Supervisor Capability. Line 2 is used for toggling between 2 different base station
radios and Supervisor is used to shut down any paralleled remotes. Pressing the FREQ and INTER keys
simultaneously activates the Supervisor or the Line 2 mode depending on the options installed in the unit.
Pressing the keys again deactivates the Supervisor or the Line 2 mode. When activated LED 1 changes from red
to orange.
Optional DTMF Dialing: After selecting the desired Function Tone for frequency selection, type the desired
DTMF sequence on the number keys (0-9, *, #) followed by the SEND key. The TRC will generate the High-Level
Guard Tone followed by the continuous Low-Level Guard Tone. The DTMF tones will go out over the Low-Level
Guard Tone. The user can then follow the tones with voice if desired. If a mistake is made during entering the
desired sequence, pressing the * and # keys simultaneously will clear the keystrokes buffer.

11
THEORY OF OPERATION
Analog Circuit
RX Audio Input Path: RX audio from a tone remote adaptor at the remote site travels down the phone line to the
RJ-11 line interface connector PL-1. Line 1 uses the standard red/green Telco ring tip on positions 5 and 6 of the
RJ-11 cable or pins 5 and 6 of the RJ-45 10-pin connector. This signal is fed into a transient absorber across the
line, then through an auto-resettable polyswitch fuse to another set of transorbs that can shunt a signal to ground
if the ground lead is tied to Earth. There are then 2 capacitors across the line, which also go to Earth to remove
RF. The audio signal is then fed into transformer T201 through jumpers JP202 and JP203 or Line 2 relay K201.
From the bottom winding of T201 audio is fed to jumper JP204 contacts 1 and 2 or contacts 2 and 3 if using T202
in a 4-wire duplex configuration. From JP204 audio is fed into the RX Input Gain Pot RP-306 where the output
level of the RX line amp U302 is typically set to 200 mV p-p with –20 dbm from a Line Test Set tone generator.
There is a disable transistor Q303 that can mute the incoming audio under microprocessor control. Coming out of
the RX line amp the audio is passed to the compression circuit U102B. The audio output of the compressor is
also about 165 mV p-p and will change no more than 3 db over a 30-35 db input change. The audio then goes
into the RX Bandpass amplifier U301D and the output of this Bandpass is fed into the Guard Tone detector which
turns on the busy light and depending on how the unit is programmed can activate the crossmute function when
another unit in the same room is transmitting to prevent howling and feedback. The output of the Bandpass is also
fed over to the RX notch filter U301C through a nulling pot. When the Bandpass filter has been tuned to the
appropriate frequency for the desired Guard Tone (usually 2175 Hz) its output is fed through the nulling pot and
R303 and R346 where it mixes with audio from R324 coming from the compressor. These two signals cancel at
the summing input of Notch filter U301C thus removing the continuous Guard Tone audio leaving only the
resulting voice and dialing audio to be transmitted through the volume control SR601B to the speaker amplifier.
Keypad beeps are also input on this same pot to be heard out the speaker. When the handset is taken off-hook,
the magnetic reed switch located inside of the handset opens it’s contact which signals the microprocessor to
activate transistor Q302. Activating transistor Q302 mutes the speaker amplifier. Audio from U301C is fed into
ear level RP304 which drives the earpiece driver Q303B to drive the handset earpiece. There is also an ear mute
transistor Q304 that allows the microprocessor to mute the earphone. There is also a jumper JP302 that feeds
handset mic audio back into the earpiece for sidetone. This jumper should not be used in 4-line duplex mode.
Jumper JP201 feeds DTMF tones into the RX audio path so that they can be heard during the dialing time.
TX Audio Output Path: Mic bias is developed with R100, R134 and R101. This provides mic bias to either the
internal mic, or gooseneck mic. These are all electret type mics. When using the internal mic or gooseneck mic,
Q306 switches audio into the mic amp U101A where the gain is set by RP101. Q101 on the input of the mic amp
kills mic audio during the High-Level function tones and dialing times. Coming out of the mic amp the audio level
is approximately 200 mv peak to peak where it is fed into the compressor U102A. The audio out of it is also about
200 mv peak to peak and will change no more than 3 db over a 30-35 db input change. It is then fed into notch
filter U103C and U103D. This notch filter is usually set to the standard Guard Tone of 2175 Hz and is designed to
remove 2175 Hz components from the voice so that they do not mix with the 2175 tone generator and cause
phase cancellation and thus momentary breaks in the Low-Level Guard Tone. The notch filter feeds into the audio
mixer along with the signaling and dialing tones from the digital to analog converter. The tones and voice out of
the audio mixer are presented to the TX line level pot RP202 and then to the line amplifier U201A. U201A then
feeds the top winding of T201. When the line level pot RP202 is set all the way to maximum it is sufficient to drive
a single phone line with up to 8 additional tone remotes to about +10 db on the high level guard tone.
The regulator has an input from a wall charger of around 16-20 volts which is passed through a auto-resettable
polyswitch F601 into transient absorber TZ601, then through the volume control on/off switch SR601A to an RF
bypass cap C602, across several filter caps into the input of the 13.4 volt regulator. D601 is a reverse polarity
diode that will blow the auto-resettable polyswitch if the power is reversed. Powering off for one to two seconds
will reset the polyswitch. The output of the 13.4 volt regulator is fed to all of the analog circuitry on the analog
schematic page. U303A has a voltage divider R373 and R374 that creates the analog pseudo ground reference to
all of the op amps on the analog schematic page.

12
Digital Circuit
There are three microprocessors on the digital schematic page. U402 controls the keypad interface and
generates the keyboard beeps to the speaker amp, it controls the speaker mute when the handset is taken off-
hook. Additionally, it controls the optional Line 2/Supervisor to the line relay on the analog page.
Microprocessor U401 generates the Guard Tone, function tones and signaling tones on its B0-B7 port. These
tones are fed into U405 the DAC output over to the analog page. U401 also controls PTT disable, PTT mic enable
and ear mute. Both of these microprocessors get their voltage from 5-volt regulator U601.
Microprocessor U403 decodes the high and low level guard tone, as well as the function tones.

13
TECHNICAL NOTES
No technical notes are available at this time.
MIDIAN CONTACT INFORMATION
MIDIAN ELECTRONICS, INC.
2302 East 22nd Street
Tucson, Arizona 85713 USA
Toll-Free: 1-800-MIDIANS
Main: 520-884-7981
E-mail: [e-mail]
Web: www.midians.com

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1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
+
10u
C308
2
TP601
TZ206
P0300
2
3
-
+
9
10
8
U302:3
LM660
+
33u
C304
TP103
300mA Resettable
F202
1
2
3
RP201
100
-
+
13
12
14
U103:4
LM660
1
2
3
RP102
5
1
JP204
2
2
2
TZ202
P0300
1
2
3
RP306
10
1
2
3
RP304
100
R370
2
TP306
74LVC1G3157
Y0
3
Y1
1
GND
2
Z4
VDD 5
S
6
U104
TP202
1
JP207
1
2
3
RP203
100
1
JP206
R212
300R
-
+
2
3
1
411
U101:1
LM660
4 5
SR601:1
1 3
2
SW VOL
SR601:2
R351
2.2
2
3
1
JP306
1
JP202
1
JP101
-
+
6
5
7
U301:2
LM660
2
U102-B
RECT_IN 13
AT _CAP 12
G_OUT 11
THD_TRIM 10
VCC
16
GND
8
REC_CAP
14
G_IN
9
TR _TRIM 15
SA572
D604
5.1V
R224
*
R214
300R
3
-
+
2
3
1
411
U302:1
LM660
1
JP308
TP201
1
2
3
RP101
100
TZ601
P0300
1
J1
EARTH GROUND POST
+
470u
C322
-
+
2
3
1
411
U103:1
LM660
3
TZ205
P0300
+
33u
C614
+
470u
C208
3
LM7815
VIN
1
GND
2
VOUT 3
U603
R341
300R
3
5
6
10
8
7
12
1
201
DF2E-DC12V
3
2
1
RP302
1
1
JP203
+
10u
C211
-
+
9
10
8
U301:3
LM660
P S
1 6
5
3 4
2
T202
42TU016
U102-A
RECT_IN
3
AT _CAP
4
G_OUT
5
THD_TRIM
6
VCC 16
GND 8
REC_CAP 2
G_IN 7
TR _TRIM
1
SA572
+
47u
C110
+
33u
C601
2
+
33u
C612
TZ203
P0300
TP104
2
-
+
6
5
7
U101:2
LM660
-
9
7
U201:3
LM4950
2
-
+
13
12
14
U101:4
LM660
1
JP201
-
+
2
3
1
411
U301:1
LM660
1
2
3
RP303
5
+
33u
C611
1
2
3
4
5
6
7 8
PL3
RJ-11
-
+
6
5
7
U302:2
LM660
2
-
+
9
10
8
U101:3
LM660
1
JP302
1
JP307
1
JP303
+
10u
C210
TP302
TP303
TP301
TP304
R208
10R
1
JP210
2
-
+
13
12
14
U301:4
LM660
2
R211
300R
+
33u
C323
+
47u
C311
3
+
33u
C615
-
+
9
10
8
U103:3
LM660
1
JP211
-
+
13
12
14
U302:4
LM660
2
R215
300R
1
2
3
RP202
1
1
JP309
1
2
PL101
TP100
3
2
1
RP103
1
750 mA Resettable Fuse
F601
1
JP304
R371
2
1
JP205
2
-
1
3
U201:1
LM4950
TP305
TZ201
P0300
1
JP209
2
TZ204
P0300
1
JP301
4
300mA Resettable
F201
TP101
1
JP208
1
2
3
4
5
6
7
8
9
10
PL1
RJ-45 10 PIN
2
1
2
PL301
2
TP102
2
R139
2
1
JP305
P S
1 6
5
3 4
2
T201
42TU016
2
-
+
6
5
7
U103:2
LM660
2
SHUTDOWN
2
BYPASS
8
GND TAB 5
GND 4
VDD 6
U201:2
LM4950
+15V
+15V
VAN_A
VAN_A
+15V VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
+15V
VAN_A
+5V
+5V
+15V
+15V
+15V
+15V
+15V
+15V
+15V
VAN_A
+15V
+15V
VAN_A
VAN_A
+15V
+15V
VAN_A
+15V
+15V
+5V
VAN_A
+15V+5V
+15V
+5V
LLG_TONE
DECODER_AUDIO
HANDSET_PTT
EXT_HOO /MONITOR
DAC_OUT
LINE_2/SUPERVISOR
PTT_LINE_AMP_ENABLE
PTT_MIC_ENABLE
EYPAD_BEEP
OFFHOO _SP R_MUTE
PTT_DISABLE
EAR_MUTE
MIC_AUD_SELECT
FNC_TONE
INTEROP_XOVER
REF_A
REF_A
TXD2
RXD2
HLG_DET
HLG_SP _MUTE
HLG_SP _MUTE
BLK
RED
GRN
YEL
MIC HI YEL
EARPCS GRN
GND BLK
SIMPLEX HANDSET
EAR LEVEL
EXT MON/HOOK RED
GOOSENECK/INT
MICROPHONE
HANDSET
INTERFACE
SPEAKER
LINE
INTERFACE
NOTES
* = NOT INSTALLED
RX NOTCH BANDPASS TUNING
NULLING
NULLING
1
18 to 22 VDC
DURING
SIMPLEX TX
DAC TONE LEVEL
EXT_PTT_IN WHT
+1 V OUT BLU
RX GAIN
MIC AMP
7. VOLTS
ANALOG REFERENCE
TX NOTCH FILTER TUNING
TX NOTCH
LINE AMP
DAC SIDETONE JUMPER
FROM
SPK AMPRX NOTCH
BANDPASS
LINE LEVEL
AUDIO MIXER
RX NOTCH
COMPANDOR
COMPANDOR
4 WIRE/DUPLEX
OPTION
SUPERVISOR/LINE2/
4 WIRE OPTION
SIDE TONE JUMPER
UNDER 4-WIRE OPERATION
GUARD TONE DETECTOR
RX LINE AMP
+1 V REGULATOR
TRC-1, TRC-300, AND TRC-400
R44 AND R447 INSTALLED AND
2000 T0 3100 HZ.
2000 T0 3100 HZ.
09-1 -200 - HANDSET NOTE:
PLACE 10K RESISTOR
ACROSS MIKE ELEMENT
(MULTITURN)
(0805) (0805)
(1206) (0805)
(0805) (0805)
(1206)
(0805)
(MULTITURN)
PRODUCTION DATE OF CMX469AD3
C 16 = NOT INSTALLED
NOTE3 - C 2 = 1uF USED ONLY WITH SPECIFIC
NOTE2 - ZAP FORMAT C 1 AND C 16 AS SHOWN.
GSTAR FORMAT C 1 = .0047u AND
R4 2 NOT INSTALLED
NOTE4 - R44 , R447 AND R4 2 = 0R WHEN INSTALLED
TRC-100/200
R44 INSTALLED
R447 AND R4 2 NOT INSTALLED
TRC- 00, TRC-600
R4 2 INSTALLED
R44 AND R447 NOT INSTALLED
COMPANDOR
NOTE - ONLY INSTALLED WHEN LCD OPTION REQUIRED.
HLG 13 Vp-p
HLG 13 Vp-p
16 mVp-p
200 mVp-p
8 Ohm at 2 Watt
SEE
SP AMP
1/3
PTT
EXT.
RELAY
M LEAD
SEE RX
NOTCH
SEE AUDIO
MIXER
BYPASS
COMPANDOR
ENABLE
SEE
MCU PAGE
3/3
2/3
SPARE
FIXED
ADJ
EAR
DUPLX TRUNK GO
AHEAD BEEP
2W
60 mVp-p
LLG
11.7 Vp-p Full Volume @ -5 dbm
11.8 Vp-p
@0 dbm
HLG 11.3 Vp-p
5.8 Vp-p MIN TRIGGER
SP R MUTE
200 mVp-p
200 mVp-p
FUTURE USE
2 1
A6
D601:1
3 1
A6
D601:2
2 1
A6
D602:1
3 1
A6
D602:2
PL601
560p
C602
.47u
C603
.1u
C613
+
2.2u
C305 +
2.2u
C320
10
R373
9.1
R374
-
+
2
3
1
LM324
U303:1
4
VCCVCC
11
GNDGND
LM324
U303:5
.1u
C336
+
2.2u
C100
4.7
R100
4.7
R101
5.6
R134
.1u
C114
.1u
C113
470
R140
20
R102
560p
C101 .1u
C120
100
R104
.47u
C122
BSS
Q101
10
R127 100
R131
100
R132
47
R133
47
R128
Y25
Q102
Y25
Q103
.01u
C121
0R
R225
.01u
C209
.1u
C102
.1u
C117
220p
C103
22
R141
22
R103
100
R105
1
R135
1u
C104
1u
C105
3.3
R107
330
R106
1
R110
100
R109
33
R108
1u
C106
.47u
C118
+
10u
C107
1u
C108
1u
C112
1u
C111
10
R111
10
R112
1
R136
100p
C109
0R
R113
51R
R129
.047u
C115
NPO
33
R117
10 1%
R114
10 1%
R115
10 1%
R116
10 1%
R121
10 1%
R122
10 1%
R118
36
R119
0R
R137
470R
R125
.01u
C116
.1u
C119
1
R143
10 1%
R124
10 1%
R126
10 1%
R123
NPO
10 1%
R120
1
R138
.47u
C202
.1u
C203
.1u
C206
220p
C204
4.7
R202
10
R203
0R
R206
100
R204
150
R217
150
R221
BSS
Q202
39
R207
62
R209
1M
R218
.033u
C220
220p
C207
100
R210
100
R230
.001u
C217
BSS
Q203
0R
R220
2 1
A6
D203:1
B25
Q201
4.7
R213
0R
R222
0R
R223
.001u
500V
C215
.001u
500V
C216
100R
R216
100
R226
10
R227
Y25
Q205
560p
C219
560p
C218
BSS
Q206
.22u
C212
4.7
R339
0R
R340
BSS
Q303
.047u
C317
22
R338
100
R342
150p
C316
180
R337
1
R352
3.3
R334
1u
C314
1u
C315
.1u
C312
.1u
C327
.1u
C306
750
R335
1
R332
100
R333
33
R336
1u
C313
1u
C303
100p
C310
10
R330
10
R331
1
R357
1u
C309
1u
C307
0R
R346
10 1%
R324
10 1%
R323
36
R325
10 1%
R322
10 1%
R313
10 1%
R312
10 1%
R310
33
R321
1
R362
R130
2.2
51R
R311
.047u
C325
NPO
470R
R350
.01u
C324
NPO
.1u
C326 10 1%
R309
10 1%
R308
1
R361
100
R320
4.7
R315
43
R304
47
R305
10
R303
10
R307
2.7M
R306
BSS
Q305
21
A7
D301:1
31
A7
D301:2
10
R316
1M
R314
1
R142
.01u
C338
.1u
C337
.022u
C302
1
R377
470
R376
21
A6
D302:1
3.3
R375
5.6
R301
*
C333
100
R327
10 1%
R326
4.7
R329
.01u
C330
10
R343
22
R319
39
R347
1
R372
1M
R345
.1u
C319
*
C321
62
R348
910
R349
100
R228
BSS
Q302
10
R328
100
R229
100
R378
1
R358
100
R359
100
R360
6.2
R363
47
R365
43
R366
470
R367 10
R364
-
+
13
12
14
LM324
U303:4
-
+
9
10
8
LM324
U303:3
*
C329
100p
C332
100
R369
4.7
R368
100
R354
.47u
C334
BSS
Q301
100R
R356
10
R317
4.7
R355
B25
Q304
-
+
6
5
7
LM324
U303:2
3.3
R318
100R
R353
47
R302
.47u
C318
51R
R344
.001u
500V
C213
.001u
500V
C214
.1u
C201
0R
R201
.022u
C205
100
R205
MIDIAN ELECTRONICS, INC.
DATE: 11/16/2004
DESIGN: CJS
DWN B : AWS
REV: 04/17/2009
APPR.
TRC SERIES
ANALOG SCHEMATIC
COP RIGHT 2009
SIZE
REV.
SHEET
DOCUMENT NAME
DOCUMENT NUMBER
D
G
2 of 2
TRC-7500
7500-ANLG
TRC-2 [2 Wire]

1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
X1
1
X2
2
VBkup
3
CS 4
GND
5
DIN 6
DOUT 7
SCLK 8
SQW/INT 9
VCC 10
U407
DS1390
TP501
2
P2
CAD
OSC2 42
TCMP
38
VDD 44
VPP 4
SS 37
B3 16
D7
39
OSC1 43
B0 13
B1 14
A5
7
A6
6
A7 5
A4
8
A3
9
A2 10
A1
11
A0 12
C4
27
C5 26
C3 28
C0 31
C1
30
C2
29
C6
25
C7
24
B4 17
B7 21
B6 20
GND
22
RES 1
B2 15
TCAP
41
IRQ
2
B5 19
SCK 36
MOSI 35
MISO 34
RDI 32
TDO 33
NC1
40
NC2 18
NC3
3
NC4
23
U401
68705C9AFN
2954
RESET 5
OUT1 1
OUT2 2
GND
4
IN1
8
IN2
3
IC1 6
IC2
7
U601
2
TP602
1
2
3
4
5
6
7 8
PL4
RJ-11
+
BT1
BR20321VB
RP502
100
RP503
100
74HC4046
VCC 16
PCAin 14
C1A 6
C1B 7
INH 5
GND 8
PC1out 2
VCOin 9
R2
12
R1
11
VCOout
4
PCBin
3
PCPout 1
SFout 10
PC2out 13
ZEN 15
U507
P4
-
+
3
4
1
2 5
U405
A11
OSC1 8 OSC2 9
GS
3
IN-
2
St/GT
19
ESt
18
IN+
1
VREF
4
VCC 20
PWDN
6
INH
5
GND
10
STD 17
Q1 12
Q2 13
Q3 14
Q4 15
TOE 11
NC1
7
NC2
16
U502
8870
OSC1 18 OSC2 17
SCLK/A4
3
A0
19
MOSI/A1
20
MCLR 4
VDD 15 VDD 16
VSS
5
VSS
6
B6 13
B7
14 B1 8
B2 9
B3 10
B4 11
B0
7
B5
12
A2
1
MISO/A3
2U406
PIC16F716
RX_DATA 12
CD 13
RX_S NC 15
TX_DATA_IN 5
VCC 20
CLK_RATE 18
RX_IN
14
XTAL
1
XTAL
2
TX_OUT 4
4800 17
TX_ENA 6
1200/2400 16
CDRC
19
VBIAS
9
VSS
10
TX_S NC 3 NC2
7
NC3
8
NC4
11
U508
CMX469AD3
2954
RESET 5
OUT1 1
OUT2 2
GND
4
IN1
8
IN2
3
IC1 6
IC2
7
U602
1
JP409
VCC 16
EN 10
CLR 15
GND
8
Q3
14 Q2 13
Q0
11
Q1
12
CLK
9
U506:2
4520
Y401
3.58M
TP603
TP504
5
6
4
U505:2
4070
TP507
P1
+
-
5
6
7
84
U501:2
LM358
TP505
1 2 3 4 5 6 7 8 9 10 11 12 13
PL6
CSA-13-CON
TP506
4520
VCC 16
EN 2
CLR 7
GND
8
Q3
6Q2 5
Q0
3
Q1
4
CLK
1
U506:1
12
13
11
147
U505:4
4070
5
P3
3
P0-7
1
P0-5
2
P0-3 3
P0-1 4
P2-7 5
P2-5
6
P2-3
7
P2-1
8
SMP
9
P1-7
10
P1-5
11
P1-3 12
P1-1
13
VSS
14
VCC 28
P0-6
27
P0-4 26
P0-2 25
P0-0 24
P2-6 23
P2-4 22
P2-2
21
P2-0
20
XRES 19
P1-6
18
P1-4
17
P1-2
16
P1-0
15
U403
8C29466
TP401
BD/LCD
OSC2
42
TCMP 38
VDD 44
VPP 4
SS 37
B3 16
D7 39
OSC1
43
B0 13
B1 14
A5 7
A6 6
A7 5
A4 8
A3 9
A2 10
A1 11
A0 12
C4 27
C5 26
C3 28
C0 31
C1 30
C2 29
C6 25
C7 24
B4 17
B7 21
B6 20
GND
22
RES
1
B2
15
TCAP
41
IRQ
2
B5
19
SCK
36
MOSI
35
MISO
34
RDI
32
TDO
33
NC1 40
NC2 18
NC3
3
NC4
23
U402
68705C9AFN
Y402
4.032M
TP503
1
2
3
RP501
100
4
1
JP401
120p
C425
+
-
2
3
1
U501:1
LM358
5
8
9
10U505:3
4070
4
D605
8.2V
MAX232A
T1_IN
11
R1_OUT
12 T1_OUT 14
R1_IN 13
C1+
1
C1-
3
C2+ 4
C2- 5
VCC 16
V+ 2
V-
6
GND
15
R2_IN 8
T2_OUT 7 T2_IN
10
R2_OUT
9
U404
3
1 2 3 4 5 6 7 8 9 10 11 12 13
PL7
CSA-13-CON
1
2
3U505:1
4070
TP502
+5V
+5V
+5V
+5V
+5VLCD
+5V
+5V
+5V
+5V
+5V
VAN_D
+5V
+5V
+5V
+5V
+5V
+5V
+5V
VAN_D
VAN_D
VAN_D
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
VAN_D
+5V
+5V
+5V
+5VLCD
+15V
+5V
+5V
VAN_D
VAN_D
+5V
+5V
+5V+5V
+5V
+5V
+5V
+5V
+5V
HANDSET_PTT
DECODER_AUDIO
EXT_HOOK/MONITOR
PTT_DISABLE
PTT_MIC_ENABLE
DAC_OUT
KE PAD_BEEP
OFFHOOK_SPKR_MUTE
RESET
RESET
EAR_MUTE
CLK_B
MIC_AUD_SELECT
PTT_LINE_AMP_ENABLE
LINE_2/SUPERVISOR
CLK_A
CLK_A
CLK_B
FFSK
FFSK
RESET
PTT_LINE_AMP_ENABLE
LLG_TONE
FNC_TONE
INTEROP_XOVER
RXD2
TXD2
HLG_DET
OPTION 100
OPTION 200
DTMF
5 TONE
OPTION 600 - FLEETSYNC FORMAT
OPTION 300 - ZAP FORMAT
OPTION 400 - GSTAR FORMAT
ROW 1
ROW 2
ROW 3
ROW 4
COL 4
COL 3
COL 2
COL 1
BUSY LED
SEND LED
SPARES
SPARE
LCD INTERFACE OPTION
NOTE2
NOTE2
KEYPAD INTERFACE
DB5
DB6
DB7
DB4
ENA
R/W
RS
CTR
2.3 VOLTS
DIGITAL REFERENCE
PRINTER
OPTION
OPTION 500 - MDC FORMAT
L2/SUPER LED
FOR NOTE INFORMATION, PLEASE SEE ANALOG PAGE.
NOTE5
NOTE5
1.3W
NOTE3
C525
32 Hz.
Y403
32 Hz.
Y404
10
R501
10
R502
10
R503
10
R533
.022u
C501
100p
C502
.1u
C529
.47u
C534
+
2.2u
C528
8.2
R534
10
R508
200
R509
15
R510
100
R511
.01u
C506
560p
C507
.022u
C509
.1u
C533
100p
C508
-
+
2
3
1
LM324
U503:1
-
+
6
5
7
LM324
U503:2
-
+
9
10
8
LM324
U503:3
-
+
13
12
14
LM324
U503:4
4
VCCVCC
11
GNDGND
LM324
U503:5
39
R512
200
R513
1M
R514
10
R515
10
R404
10
R405
7.5
R516
100
R402
.001u
C510
.01u
C511
.01u
C503
22p
C401
22p
C427
4.7M
R401
470
R504
1M
R505
1M
R506
470
R507
.1u
C504
.1u
C505
21
A6
D501:1
31
A6
D501:2
0R
R445
0R
R447
10
R407
.001u
C514
10
R517
7.5
R518
27
R519 1M
R520
150
R521
.01u
C512
.01u
C513
.1u
C532
-
+
2
3
1
LM324
U504:1
-
+
6
5
7
LM324
U504:2
-
+
9
10
8
LM324
U504:3
-
+
13
12
14
LM324
U504:4
4
VCCVCC
11
GNDGND
LM324
U504:5
.1u
C531
.0022u
C515
.0022u
C516
82
R526
4.7
R527
.1u
C519
27
R525
470
R524
.1u
C530
.1u
C527
.1u
C521
15
R522
240
R523
240
R528
.0047u
C518
.047u
C517
*
C535
.001u
C520
0R
R535
.022u
C522
.1u
C523
.1u
C524
1u
C526
NOTE4
R452
*
R529
*
R532
*
R531
*
R453
.1u
C403
100
R443
100
R441
0R
R444
47
R457
.1u
C428
100
R442
39
R408
200
R403
100
R446
100
R530
100
R426
20
R411
20
R409
20
R413
20
R415
10
R410
10
R412
10
R414
470
R438
.0022u
C424
220p
C404
10
R416
10
R418
10
R420
10
R422
20
R417
20
R419
20
R421
20
R423
20
R424
330
R439
.01u
C426
12p
C402
100p
C430
100
R433
100
R425
10
R431
.1u
C431
1u
C432
22p
C405
22p
C406
4.7M
R427
100
R428
.1u
C407
100
R430
47
R429
10
R434
560p
C417
1u
C418
.1u
C419
.1u
C420
.1u
C421
.1u
C422
47
R432
100
R406
2 1
A7
D401:1
4.7
R440
BSS
Q401
100p
C416
100p
C415
100p
C414
100p
C413
100p
C412
100p
C411
100p
C410
.001u
C408
.01u
C409
*
R435
1
R436
0R
R437
.1u
C423
+
2.2u
C604
+
2.2u
C607
+
2.2u
C605
.01u
C608
*
C609
560p
C606
.1u
C610
10
R601
62
R448
30
R449
15
R450
7.5
R451 .1u
C429
MIDIAN ELECTRONICS, INC.
DATE: 11/16/2004
DESIGN: CJS
DWN B : AWS
REV: 04/17/2009
APPR.
TRC SERIES
MCU SCHEMATIC
COP RIGHT 2009
SIZE
REV.
SHEET
DOCUMENT NAME
DOCUMENT NUMBER
D
G
1 of 2
TRC-7500
7500-MCU
TRC-2 [2 Wire]

1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
+
10u
C308
2
TP601
TZ206
P0300
2
3
-
+
9
10
8
U302:3
LM660
+
33u
C304
TP103
300mA Resettable
F202
1
2
3
RP201
100
-
+
13
12
14
U103:4
LM660
1
2
3
RP102
5
1
JP204
2
2
2
TZ202
P0300
1
2
3
RP306
10
1
2
3
RP304
100
R370
2
TP306
74LVC1G3157
Y0
3
Y1
1
GND
2
Z4
VDD 5
S
6
U104
TP202
1
JP207
1
2
3
RP203
100
1
JP206
R212
300R
-
+
2
3
1
411
U101:1
LM660
4 5
SR601:1
1 3
2
SW VOL
SR601:2
R351
2.2
2
3
1
JP306
1
JP202
1
JP101
-
+
6
5
7
U301:2
LM660
2
U102-B
RECT_IN 13
AT _CAP 12
G_OUT 11
THD_TRIM 10
VCC
16
GND
8
REC_CAP
14
G_IN
9
TR _TRIM 15
SA572
D604
5.1V
R224
*
R214
300R
3
-
+
2
3
1
411
U302:1
LM660
1
JP308
TP201
1
2
3
RP101
100
TZ601
P0300
1
J1
EARTH GROUND POST
+
470u
C322
-
+
2
3
1
411
U103:1
LM660
3
TZ205
P0300
+
33u
C614
+
470u
C208
3
LM7815
VIN
1
GND
2
VOUT 3
U603
R341
300R
3
5
6
10
8
7
12
1
201
DF2E-DC12V
3
2
1
RP302
1
1
JP203
+
10u
C211
-
+
9
10
8
U301:3
LM660
P S
1 6
5
3 4
2
T202
42TU016
U102-A
RECT_IN
3
AT _CAP
4
G_OUT
5
THD_TRIM
6
VCC 16
GND 8
REC_CAP 2
G_IN 7
TR _TRIM
1
SA572
+
47u
C110
+
33u
C601
2
+
33u
C612
TZ203
P0300
TP104
2
-
+
6
5
7
U101:2
LM660
-
9
7
U201:3
LM4950
2
-
+
13
12
14
U101:4
LM660
1
JP201
-
+
2
3
1
411
U301:1
LM660
1
2
3
RP303
5
+
33u
C611
1
2
3
4
5
6
7 8
PL3
RJ-11
-
+
6
5
7
U302:2
LM660
2
-
+
9
10
8
U101:3
LM660
1
JP302
1
JP307
1
JP303
+
10u
C210
TP302
TP303
TP301
TP304
R208
10R
1
JP210
2
-
+
13
12
14
U301:4
LM660
2
R211
300R
+
33u
C323
+
47u
C311
3
+
33u
C615
-
+
9
10
8
U103:3
LM660
1
JP211
-
+
13
12
14
U302:4
LM660
2
R215
300R
1
2
3
RP202
1
1
JP309
1
2
PL101
TP100
3
2
1
RP103
1
750 mA Resettable Fuse
F601
1
JP304
R371
2
1
JP205
2
-
1
3
U201:1
LM4950
TP305
TZ201
P0300
1
JP209
2
TZ204
P0300
1
JP301
4
300mA Resettable
F201
TP101
1
JP208
1
2
3
4
5
6
7
8
9
10
PL1
RJ-45 10 PIN
2
1
2
PL301
2
TP102
2
R139
2
1
JP305
P S
1 6
5
3 4
2
T201
42TU016
2
-
+
6
5
7
U103:2
LM660
2
SHUTDOWN
2
BYPASS
8
GND TAB 5
GND 4
VDD 6
U201:2
LM4950
+15V
+15V
VAN_A
VAN_A
+15V VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
VAN_A
+15V
VAN_A
+5V
+5V
+15V
+15V
+15V
+15V
+15V
+15V
+15V
VAN_A
+15V
+15V
VAN_A
VAN_A
+15V
+15V
VAN_A
+15V
+15V
+5V
VAN_A
+15V+5V
+15V
+5V
LLG_TONE
DECODER_AUDIO
HANDSET_PTT
EXT_HOO /MONITOR
DAC_OUT
LINE_2/SUPERVISOR
PTT_LINE_AMP_ENABLE
PTT_MIC_ENABLE
EYPAD_BEEP
OFFHOO _SP R_MUTE
PTT_DISABLE
EAR_MUTE
MIC_AUD_SELECT
FNC_TONE
INTEROP_XOVER
REF_A
REF_A
TXD2
RXD2
HLG_DET
HLG_SP _MUTE
HLG_SP _MUTE
BLK
RED
GRN
YEL
MIC HI YEL
EARPCS GRN
GND BLK
SIMPLEX HANDSET
EAR LEVEL
EXT MON/HOOK RED
GOOSENECK/INT
MICROPHONE
HANDSET
INTERFACE
SPEAKER
LINE
INTERFACE
NOTES
* = NOT INSTALLED
RX NOTCH BANDPASS TUNING
NULLING
NULLING
1
18 to 22 VDC
DURING
SIMPLEX TX
DAC TONE LEVEL
EXT_PTT_IN WHT
+1 V OUT BLU
RX GAIN
MIC AMP
7. VOLTS
ANALOG REFERENCE
TX NOTCH FILTER TUNING
TX NOTCH
LINE AMP
DAC SIDETONE JUMPER
FROM
SPK AMPRX NOTCH
BANDPASS
LINE LEVEL
AUDIO MIXER
RX NOTCH
COMPANDOR
COMPANDOR
4 WIRE/DUPLEX
OPTION
SUPERVISOR/LINE2/
4 WIRE OPTION
SIDE TONE JUMPER
UNDER 4-WIRE OPERATION
GUARD TONE DETECTOR
RX LINE AMP
+1 V REGULATOR
TRC-1, TRC-300, AND TRC-400
R44 AND R447 INSTALLED AND
2000 T0 3100 HZ.
2000 T0 3100 HZ.
09-1 -200 - HANDSET NOTE:
PLACE 10K RESISTOR
ACROSS MIKE ELEMENT
(MULTITURN)
(0805) (0805)
(1206) (0805)
(0805) (0805)
(1206)
(0805)
(MULTITURN)
PRODUCTION DATE OF CMX469AD3
C 16 = NOT INSTALLED
NOTE3 - C 2 = 1uF USED ONLY WITH SPECIFIC
NOTE2 - ZAP FORMAT C 1 AND C 16 AS SHOWN.
GSTAR FORMAT C 1 = .0047u AND
R4 2 NOT INSTALLED
NOTE4 - R44 , R447 AND R4 2 = 0R WHEN INSTALLED
TRC-100/200
R44 INSTALLED
R447 AND R4 2 NOT INSTALLED
TRC- 00, TRC-600
R4 2 INSTALLED
R44 AND R447 NOT INSTALLED
COMPANDOR
NOTE - ONLY INSTALLED WHEN LCD OPTION REQUIRED.
HLG 13 Vp-p
HLG 13 Vp-p
16 mVp-p
200 mVp-p
8 Ohm at 2 Watt
SEE
SP AMP
1/3
PTT
EXT.
RELAY
M LEAD
SEE RX
NOTCH
SEE AUDIO
MIXER
BYPASS
COMPANDOR
ENABLE
SEE
MCU PAGE
3/3
2/3
SPARE
FIXED
ADJ
EAR
DUPLX TRUNK GO
AHEAD BEEP
2W
60 mVp-p
LLG
11.7 Vp-p Full Volume @ -5 dbm
11.8 Vp-p
@0 dbm
HLG 11.3 Vp-p
5.8 Vp-p MIN TRIGGER
SP R MUTE
200 mVp-p
200 mVp-p
FUTURE USE
2 1
A6
D601:1
3 1
A6
D601:2
2 1
A6
D602:1
3 1
A6
D602:2
PL601
560p
C602
.47u
C603
.1u
C613
+
2.2u
C305 +
2.2u
C320
10
R373
9.1
R374
-
+
2
3
1
LM324
U303:1
4
VCCVCC
11
GNDGND
LM324
U303:5
.1u
C336
+
2.2u
C100
4.7
R100
4.7
R101
5.6
R134
.1u
C114
.1u
C113
470
R140
20
R102
560p
C101 .1u
C120
100
R104
.47u
C122
BSS
Q101
10
R127 100
R131
100
R132
47
R133
47
R128
Y25
Q102
Y25
Q103
.01u
C121
0R
R225
.01u
C209
.1u
C102
.1u
C117
220p
C103
22
R141
22
R103
100
R105
1
R135
1u
C104
1u
C105
3.3
R107
330
R106
1
R110
100
R109
33
R108
1u
C106
.47u
C118
+
10u
C107
1u
C108
1u
C112
1u
C111
10
R111
10
R112
1
R136
100p
C109
0R
R113
51R
R129
.047u
C115
NPO
33
R117
10 1%
R114
10 1%
R115
10 1%
R116
10 1%
R121
10 1%
R122
10 1%
R118
36
R119
0R
R137
470R
R125
.01u
C116
.1u
C119
1
R143
10 1%
R124
10 1%
R126
10 1%
R123
NPO
10 1%
R120
1
R138
.47u
C202
.1u
C203
.1u
C206
220p
C204
4.7
R202
10
R203
0R
R206
100
R204
150
R217
150
R221
BSS
Q202
39
R207
62
R209
1M
R218
.033u
C220
220p
C207
100
R210
100
R230
.001u
C217
BSS
Q203
0R
R220
2 1
A6
D203:1
B25
Q201
4.7
R213
0R
R222
0R
R223
.001u
500V
C215
.001u
500V
C216
100R
R216
100
R226
10
R227
Y25
Q205
560p
C219
560p
C218
BSS
Q206
.22u
C212
4.7
R339
0R
R340
BSS
Q303
.047u
C317
22
R338
100
R342
150p
C316
180
R337
1
R352
3.3
R334
1u
C314
1u
C315
.1u
C312
.1u
C327
.1u
C306
750
R335
1
R332
100
R333
33
R336
1u
C313
1u
C303
100p
C310
10
R330
10
R331
1
R357
1u
C309
1u
C307
0R
R346
10 1%
R324
10 1%
R323
36
R325
10 1%
R322
10 1%
R313
10 1%
R312
10 1%
R310
33
R321
1
R362
R130
2.2
51R
R311
.047u
C325
NPO
470R
R350
.01u
C324
NPO
.1u
C326 10 1%
R309
10 1%
R308
1
R361
100
R320
4.7
R315
43
R304
47
R305
10
R303
10
R307
2.7M
R306
BSS
Q305
21
A7
D301:1
31
A7
D301:2
10
R316
1M
R314
1
R142
.01u
C338
.1u
C337
.022u
C302
1
R377
470
R376
21
A6
D302:1
3.3
R375
5.6
R301
*
C333
100
R327
10 1%
R326
4.7
R329
.01u
C330
10
R343
22
R319
39
R347
1
R372
1M
R345
.1u
C319
*
C321
62
R348
910
R349
100
R228
BSS
Q302
10
R328
100
R229
100
R378
1
R358
100
R359
100
R360
6.2
R363
47
R365
43
R366
470
R367 10
R364
-
+
13
12
14
LM324
U303:4
-
+
9
10
8
LM324
U303:3
*
C329
100p
C332
100
R369
4.7
R368
100
R354
.47u
C334
BSS
Q301
100R
R356
10
R317
4.7
R355
B25
Q304
-
+
6
5
7
LM324
U303:2
3.3
R318
100R
R353
47
R302
.47u
C318
51R
R344
.001u
500V
C213
.001u
500V
C214
.1u
C201
0R
R201
.022u
C205
100
R205
MIDIAN ELECTRONICS, INC.
DATE: 11/16/2004
DESIGN: CJS
DWN B : AWS
REV: 04/17/2009
APPR.
TRC SERIES
ANALOG SCHEMATIC
COP RIGHT 2009
SIZE
REV.
SHEET
DOCUMENT NAME
DOCUMENT NUMBER
D
G
2 of 2
TRC-7500
7500-ANLG
TRC-2 [4 Wire]

1
1
2
2
3
3
4
4
5
5
6
6
D D
C C
B B
A A
X1
1
X2
2
VBkup
3
CS 4
GND
5
DIN 6
DOUT 7
SCLK 8
SQW/INT 9
VCC 10
U407
DS1390
TP501
2
P2
CAD
OSC2 42
TCMP
38
VDD 44
VPP 4
SS 37
B3 16
D7
39
OSC1 43
B0 13
B1 14
A5
7
A6
6
A7 5
A4
8
A3
9
A2 10
A1
11
A0 12
C4
27
C5 26
C3 28
C0 31
C1
30
C2
29
C6
25
C7
24
B4 17
B7 21
B6 20
GND
22
RES 1
B2 15
TCAP
41
IRQ
2
B5 19
SCK 36
MOSI 35
MISO 34
RDI 32
TDO 33
NC1
40
NC2 18
NC3
3
NC4
23
U401
68705C9AFN
2954
RESET 5
OUT1 1
OUT2 2
GND
4
IN1
8
IN2
3
IC1 6
IC2
7
U601
2
TP602
1
2
3
4
5
6
7 8
PL4
RJ-11
+
BT1
BR20321VB
RP502
100
RP503
100
74HC4046
VCC 16
PCAin 14
C1A 6
C1B 7
INH 5
GND 8
PC1out 2
VCOin 9
R2
12
R1
11
VCOout
4
PCBin
3
PCPout 1
SFout 10
PC2out 13
ZEN 15
U507
P4
-
+
3
4
1
2 5
U405
A11
OSC1 8 OSC2 9
GS
3
IN-
2
St/GT
19
ESt
18
IN+
1
VREF
4
VCC 20
PWDN
6
INH
5
GND
10
STD 17
Q1 12
Q2 13
Q3 14
Q4 15
TOE 11
NC1
7
NC2
16
U502
8870
OSC1 18 OSC2 17
SCLK/A4
3
A0
19
MOSI/A1
20
MCLR 4
VDD 15 VDD 16
VSS
5
VSS
6
B6 13
B7
14 B1 8
B2 9
B3 10
B4 11
B0
7
B5
12
A2
1
MISO/A3
2U406
PIC16F716
RX_DATA 12
CD 13
RX_S NC 15
TX_DATA_IN 5
VCC 20
CLK_RATE 18
RX_IN
14
XTAL
1
XTAL
2
TX_OUT 4
4800 17
TX_ENA 6
1200/2400 16
CDRC
19
VBIAS
9
VSS
10
TX_S NC 3 NC2
7
NC3
8
NC4
11
U508
CMX469AD3
2954
RESET 5
OUT1 1
OUT2 2
GND
4
IN1
8
IN2
3
IC1 6
IC2
7
U602
1
JP409
VCC 16
EN 10
CLR 15
GND
8
Q3
14 Q2 13
Q0
11
Q1
12
CLK
9
U506:2
4520
Y401
3.58M
TP603
TP504
5
6
4
U505:2
4070
TP507
P1
+
-
5
6
7
84
U501:2
LM358
TP505
1 2 3 4 5 6 7 8 9 10 11 12 13
PL6
CSA-13-CON
TP506
4520
VCC 16
EN 2
CLR 7
GND
8
Q3
6Q2 5
Q0
3
Q1
4
CLK
1
U506:1
12
13
11
147
U505:4
4070
5
P3
3
P0-7
1
P0-5
2
P0-3 3
P0-1 4
P2-7 5
P2-5
6
P2-3
7
P2-1
8
SMP
9
P1-7
10
P1-5
11
P1-3 12
P1-1
13
VSS
14
VCC 28
P0-6
27
P0-4 26
P0-2 25
P0-0 24
P2-6 23
P2-4 22
P2-2
21
P2-0
20
XRES 19
P1-6
18
P1-4
17
P1-2
16
P1-0
15
U403
8C29466
TP401
BD/LCD
OSC2
42
TCMP 38
VDD 44
VPP 4
SS 37
B3 16
D7 39
OSC1
43
B0 13
B1 14
A5 7
A6 6
A7 5
A4 8
A3 9
A2 10
A1 11
A0 12
C4 27
C5 26
C3 28
C0 31
C1 30
C2 29
C6 25
C7 24
B4 17
B7 21
B6 20
GND
22
RES
1
B2
15
TCAP
41
IRQ
2
B5
19
SCK
36
MOSI
35
MISO
34
RDI
32
TDO
33
NC1 40
NC2 18
NC3
3
NC4
23
U402
68705C9AFN
Y402
4.032M
TP503
1
2
3
RP501
100
4
1
JP401
120p
C425
+
-
2
3
1
U501:1
LM358
5
8
9
10U505:3
4070
4
D605
8.2V
MAX232A
T1_IN
11
R1_OUT
12 T1_OUT 14
R1_IN 13
C1+
1
C1-
3
C2+ 4
C2- 5
VCC 16
V+ 2
V-
6
GND
15
R2_IN 8
T2_OUT 7 T2_IN
10
R2_OUT
9
U404
3
1 2 3 4 5 6 7 8 9 10 11 12 13
PL7
CSA-13-CON
1
2
3U505:1
4070
TP502
+5V
+5V
+5V
+5V
+5VLCD
+5V
+5V
+5V
+5V
+5V
VAN_D
+5V
+5V
+5V
+5V
+5V
+5V
+5V
VAN_D
VAN_D
VAN_D
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
VAN_D
+5V
+5V
+5V
+5VLCD
+15V
+5V
+5V
VAN_D
VAN_D
+5V
+5V
+5V+5V
+5V
+5V
+5V
+5V
+5V
HANDSET_PTT
DECODER_AUDIO
EXT_HOOK/MONITOR
PTT_DISABLE
PTT_MIC_ENABLE
DAC_OUT
KE PAD_BEEP
OFFHOOK_SPKR_MUTE
RESET
RESET
EAR_MUTE
CLK_B
MIC_AUD_SELECT
PTT_LINE_AMP_ENABLE
LINE_2/SUPERVISOR
CLK_A
CLK_A
CLK_B
FFSK
FFSK
RESET
PTT_LINE_AMP_ENABLE
LLG_TONE
FNC_TONE
INTEROP_XOVER
RXD2
TXD2
HLG_DET
OPTION 100
OPTION 200
DTMF
5 TONE
OPTION 600 - FLEETSYNC FORMAT
OPTION 300 - ZAP FORMAT
OPTION 400 - GSTAR FORMAT
ROW 1
ROW 2
ROW 3
ROW 4
COL 4
COL 3
COL 2
COL 1
BUSY LED
SEND LED
SPARES
SPARE
LCD INTERFACE OPTION
NOTE2
NOTE2
KEYPAD INTERFACE
DB5
DB6
DB7
DB4
ENA
R/W
RS
CTR
2.3 VOLTS
DIGITAL REFERENCE
PRINTER
OPTION
OPTION 500 - MDC FORMAT
L2/SUPER LED
FOR NOTE INFORMATION, PLEASE SEE ANALOG PAGE.
NOTE5
NOTE5
1.3W
NOTE3
C525
32 Hz.
Y403
32 Hz.
Y404
10
R501
10
R502
10
R503
10
R533
.022u
C501
100p
C502
.1u
C529
.47u
C534
+
2.2u
C528
8.2
R534
10
R508
200
R509
15
R510
100
R511
.01u
C506
560p
C507
.022u
C509
.1u
C533
100p
C508
-
+
2
3
1
LM324
U503:1
-
+
6
5
7
LM324
U503:2
-
+
9
10
8
LM324
U503:3
-
+
13
12
14
LM324
U503:4
4
VCCVCC
11
GNDGND
LM324
U503:5
39
R512
200
R513
1M
R514
10
R515
10
R404
10
R405
7.5
R516
100
R402
.001u
C510
.01u
C511
.01u
C503
22p
C401
22p
C427
4.7M
R401
470
R504
1M
R505
1M
R506
470
R507
.1u
C504
.1u
C505
21
A6
D501:1
31
A6
D501:2
NOTE4
R445
NOTE4
R447
10
R407
.001u
C514
10
R517
7.5
R518
27
R519 1M
R520
150
R521
.01u
C512
.01u
C513
.1u
C532
-
+
2
3
1
LM324
U504:1
-
+
6
5
7
LM324
U504:2
-
+
9
10
8
LM324
U504:3
-
+
13
12
14
LM324
U504:4
4
VCCVCC
11
GNDGND
LM324
U504:5
.1u
C531
.0022u
C515
.0022u
C516
82
R526
4.7
R527
.1u
C519
27
R525
470
R524
.1u
C530
.1u
C527
.1u
C521
15
R522
240
R523
240
R528
.0047u
C518
.047u
C517
*
C535
.001u
C520
0R
R535
.022u
C522
.1u
C523
.1u
C524
1u
C526
NOTE4
R452
*
R529
*
R532
*
R531
*
R453
.1u
C403
100
R443
100
R441
0R
R444
47
R457
.1u
C428
100
R442
39
R408
200
R403
100
R446
100
R530
100
R426
20
R411
20
R409
20
R413
20
R415
10
R410
10
R412
10
R414
470
R438
.0022u
C424
220p
C404
10
R416
10
R418
10
R420
10
R422
20
R417
20
R419
20
R421
20
R423
20
R424
330
R439
.01u
C426
12p
C402
100p
C430
100
R433
100
R425
10
R431
.1u
C431
1u
C432
22p
C405
22p
C406
4.7M
R427
100
R428
.1u
C407
100
R430
47
R429
10
R434
560p
C417
1u
C418
.1u
C419
.1u
C420
.1u
C421
.1u
C422
47
R432
100
R406
2 1
A7
D401:1
4.7
R440
BSS
Q401
100p
C416
100p
C415
100p
C414
100p
C413
100p
C412
100p
C411
100p
C410
.001u
C408
.01u
C409
*
R435
1
R436
0R
R437
.1u
C423
+
2.2u
C604
+
2.2u
C607
+
2.2u
C605
.01u
C608
*
C609
560p
C606
.1u
C610
10
R601
62
R448
30
R449
15
R450
7.5
R451 .1u
C429
MIDIAN ELECTRONICS, INC.
DATE: 11/16/2004
DESIGN: CJS
DWN B : AWS
REV: 04/17/2009
APPR.
TRC SERIES
MCU SCHEMATIC
COP RIGHT 2009
SIZE
REV.
SHEET
DOCUMENT NAME
DOCUMENT NUMBER
D
G
1 of 2
TRC-7500
7500-MCU
TRC-2 [4 Wire]