AUSTRALIAN MONITOR DCM500 - User manual

DCM500 Service Manual
Product Description
Set-Up/Test Procedures
Component Lists
Full Schematics
PCB Overlays

DCM Series
Circuit Description
The DCM series are power amplifiers designed for commercial installations. They can be used for
either low impedance (4 ohm/8 ohm) or constant voltage line speakers (100v/70v). These amplifiers
can be mounted in a standard 19” equipment rack or they can be used on a shelf or table. The DCM
series feature line level input (with parallel output) and are normally used with mixers, mixer amplifiers
or other power amplifiers. The DCM series will operate from mains voltage or 24VDC. The DCM
series also feature a DC battery trickle charge facility, auto-sensing fan cooling, plus overload, short
circuit and over temperature protection.
Power Switch
This switch controls the switching of AC power to the amplifier. A blue ‘On’ LED will indicate
whether the amplifier is switched on or off. This switch will not switch DC power on or off in DC
operation. In DC operation mode, the amplifier is always on and the blue power LED will always be
illuminated. If both AC and DC voltage supply are connected and the AC power switch is in the off
position, the amplifier will continue to operate normally from the DC supply and the mains fail LED
will indicate.
Level Control
The output level control is located in the centre of the front panel. It is a fully recessed screwdriver
adjustable pot. Turning this pot cw will increase the gain of the amplifier. At maximum setting the
input sensitivity is 300mV. The amplifier ships from the factory with the sensitivity set to 1V.
Amplifier Status Display
This VU meter indicates the output level of the amplifier. The sensing for the circuit is taken on the
amplifier side of the output transformer. The 0dB level is referenced to 100V. This is an RMS meter,
not a peak meter.
Protect
The protect LED will illuminate when the amplifier cuts out because of either over current or high
temperature. The amplifier will switch back on after approx 4 sec for an over current trip. The amplifier
will switch back on after the amplifier has cooled to 60degC for a thermal trip.
Limiter
The limiter is a hard limiter with an attack time of about 1msec. It is defeatable by removing the jumper
on the solder side of the front pcb. This however is not recommended as voltage overload and speaker
transformer current saturation may cause the amplifier to cut out under normal program material.
Current Limit and Setup
Current limit is controlled by a microprocessor (PIC12C509A). The detection is done by sensing
voltage across the emitter resistors. Trimpot P1 on the front pcb is accessible through the hole in the
top right of the chassis return (only visible with the lid off). Turning the trimpot ccw will decrease the
point at which the amp cuts out ie the amp will cut out earlier. (P1 resistance is increased.)
To set the current limit:
1. Reset the trimpot P1 turning fully clockwise.
2. Connect the amplifier to half it’s minimum load (10ohm for DCM500, 20ohm for DCM250,
40ohm for DCM120).
3. Run an rms 1kHz sine wave into the amplifier and set the input level so that you read
425mVDC (DCM250/500) or 825mVDC (DCM120) across the emitter resistor, measuring the
side which has the higher current (measured as a voltage across the emitter resistors).
4. Turn the trimpot P1 ccw till the amplifier cuts out. The amplifier is set to the factory default.
Thermal and Fan control and Setup

The thermal cutout and fan is controlled by a microprocessor (PIC12C509A). The temperature is
sensed using a 10k@25degC NTC. The fan is normally off and turns on to full speed at 60degC. This
temperature is fixed and not adjustable. The thermal cutout temperature is set using the trimpot
accessible through the hole in the top left side of the chassis return (only visible with the lid off).
Turning the trimpot cw will decrease the point at which the amp cuts out ie the amp will cut out earlier.
Power Amp
The power amplifier is a push pull single supply amplifier driven by a class A transformer coupled
front end. The drive is provided by HEXFETs (RF9520/9530) into NPN BJTs (TIP35C). When
replacing the FETs it is recommended that you replace both FETs. The matching of these FETs
determines the balancing of the emitter currents in the output devices. For optimum performance the
emitter currents in each side should match to within 30% of each other.
Bias Setup
The amplifier is set with a bais setting of 1mV measured across the emitter resitors.
Bias is set using the trimpots located on the power pcbs on each side of the amplifier.
Turning the trimpots cw increases the bias.
If the HEXFETs have been replaced the resistor in series with the pot may need to be changed. Use a
lower value resistor if the bias cannot be turned off or a higher value if the bias cannot be turn on.
AC Power Inlet
The operating voltage is 230/240 VAC @ 50 Hz. The 3 pin IEC power inlet is located on the bottom
left of the rear panel and accepts a standard mains power lead fitted with an IEC connector. Before
plugging in a power lead, please check the rear panel of the amplifier to ensure that the voltage switch
is set correctly for your part of the world.
The inlet is equipped with an in-built AC fuse containing the rated fuse and a spare.
24 Volt DC Power Inlet
The DCM series feature optional 24VDC power to run off a battery back-up if required. This is
connected via the rear binding posts. The front panel Power Switch will not switch DC power ‘on’ or
‘off’ in DC operation. In this mode the amplifier is always ‘on’.
The trickle charge resistor across the diode is a 47ohm/5watt wire wound resistor. The maximum
trickle current is 300mA supplied from internal 35V rails.
230V/240V Slide Switch
The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch
located on the center of the rear panel. This switch should be set to match the AC voltage of your
country. The mains transformer is wound with a 230V winding plus a 10V winding internally
connected.
Speaker Output Terminal Strip
The screw terminals located on the top left of the rear panel allow access to the direct speaker outputs
of the amplifier. Reading from left to right the terminals are:
COM Common or “-” for low impedance speaker loads (4 or 8 ohms)
4 Positive “+” for 4 ohm speaker loads (use with common)
8 Positive “+” for 8 ohm speaker loads (use with common) DCM120 only
COM Common or “-” for 70v or100v speaker loads
70 Positive “+” for 70v line speaker loads (use with common) DCM120/500 only
100 Positive “+” for 100v line speaker loads (use with common)
Please ensure that the correct “Common” is used. Low impedance and 70/100v loads can be used
simultaneously but please pay careful attention to the overall speaker load.
Note: The minimum impedance (or maximum load) at 100 volt line should be no less than

DCM120 – 80 ohms
DCM250 – 40 ohms
DCM500 – 20 ohms
XLR Audio Input and Parallel Output
The DCM series includes both male and female 3 pin XLR connectors per channel. While the female is
normally used as the input to the amplifier, both XLR’s are connected in parallel so either will work.
The XLR’s inputs are transformer balanced and wired as:
Pin 1: Shield.
Pin 2: Hot, +, Positive
Pin 3: Cold, -, Negative
Fuse Sizes
(DCM120)
Mains: 230 VAC 4 Amperes Slow Blow HRC 20x5mm
DC: 10 Amperes Slow Blow HRC 20x5mm
(DCM250)
Mains: 230 VAC 6.3 Amperes Slow Blow 20x5mm
DC: 2 x 10 Amperes Slow Blow HRC 3AG
(DCM500)
Mains: 230 VAC 10 Amperes Slow Blow HRC 20x5mm
DC: 2 x 35 Amperes Slow Blow 3AG

TESTING PROCEDURE OF DCM 120/DCM 250/DCM 500
I. PRE-TESTING (of complete sets).
•Check
1.1 All screw for tightness (Bridge rectifier and transistor bolts)
1.2 Earth Connection for good contact (solder and crimpling)
1.3 This setup has signal input to the Amplifier through male (XLR)
1.4 Check with Multimeter that there is a DC resistance of about 250 Ωbetween
Pin2 & Pin3 of each of XLR’s. Also between (Pin 1 & Pin 3) and (Pin1 & Pin2).
There should be very high resistance. (IE: no reading).
2. Electrical Check
2.1 Fuse Check:
DCM 120 DCM 250 DCM 500
Mains fuse: 4AT 6.3 AT 10 AT
DC fuse: 10AT (x1) 10AT (x2) 35AT (x2)
2.2 Connect the Amplifier to the setup (Variac voltage = 0V) set all presets on front
board (only) fully clockwise, voltage selector switch to 230V
2.3 Slowly increase the input voltage to 230V, keep watching the input current
should not exceed 0.1A for DCM-120, 0.1A for DCM-250, 0.1A for DCM 500.
2.4 Check and reset if necessary all emitter resistor voltages with the help of preset.
(Each emitter resistor voltage should be between 0.5 mV to 0.8 mV )
2.5 Check DC voltage Main rail = 33V
7815 input = 30V
7815 output = 15.5V
2.6 Give input signal of 500 mV to get outputs as follows (@ 4Ωoutput load)/ 22V
for DCM 120, 32VAC for DCM250, 44.7VAC for DCM 500. Check 100V O/p
at 100vV line, Remove the input signal

II. FINAL TESTING
(This setup should have signal input to Amplifier through female (XLR)
(The limiter link should be out of circuit initially.)
1. Connect the Amplifier to the setup, set voltage selector switch to 240V
2. Switch ON the set to 240VAC.
3. Slowly increase the input signal (of 1kHz) keep watching the 24dB LED, it should
glow at approx 9V output. Increase the input signal to get 70VAC output.
4. Check Dc voltage of all emitter resistors, Minimum value should be within 30% of
the maximum value.
5. Slowly increase the input signal, keep watching the 0db LED, it should glow at 100V
±5V output voltage.
6. Set 100V 1kHz as 0db reference. Change frequency to 10kHz check dB level drop. It
should be 2.5dB ±0.5dB.
7. Change the frequency to 1kHz, reduce signal level to get 10VAC output. Half the
output load.
8. Overload setting: - Check the DC voltage at the emitter resistors having the
maximum voltage value. Increase input signal to get 820mV for DCM 120, 425mV
(for DCM250 & DCM 500). Turn preset (P2) anticlockwise such that it just mutes
the output signal and signal returns back slowly after 2 seconds.
9. Reduce the signal & re check whether the signal mutes at the corresponding above
stated voltages.
10. Again make the output load to original full value. Turn volume preset fully
anticlockwise, set input signal strength to 1V, set volume preset clockwise to get
100V output.
11. Set input signal strength to get output 110V VAC. Insert limiter link, the signal
should reduce to 100V ±5V.
12. Remove the input signal and check noise. It should measure less than 25mV.
III. THERMAL & SOAK TEST
1. Connect the Amplifier to the setup : Output load = 4ΩOutput Voltage: (DCM 120):
14V. (DCM 250):20V. (DCM 500): 40V
2. Set the Amplifier thermal cut off temperature at around 105°C with the help of preset
P4.
3. Leave the unit “ON” (with lid fixed, if possible) for 24 hours.
IV. Sound Test/Listening test.
1. Switch On the set. Check for any switch on thump.
2. Connect CD player to the input, listen for irregularities if any.
3. Switch off the set check for switch off noises.

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A3
Date: 6-May-2003 Sheet of
File: C:\DCM Manuals\CD6203-1.DDB Drawn By:
C8
0.15u
S1
F3
35A
F1
10A
F2
35A
D1
40A
C3 C4C2C1
BR1
T1
R2
47R
R1
4K7
R3
100R
D3
12V
D2
RY1
BR3
C5
4u7
C6
4u7
C7
10u
V1
BC639
C
5
4
3
2
1
X1
1
SBG
-
+
24V
BATTERY
+35VDC
240AC IN
10000U
X1X4 X2X3X5X6
X7
123
X8
123
CD6203-1
DCM500 POWER SUPPLY
PCB6203
2

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File: C:\DCM Manuals\CD6201-12.DDB Drawn By:
R42B
10R
R39B
4K7
R37
0R
D4
V16
R39A
10R
R40
0R
R38B
47k
R38A
47k
D2A
D2B
R1B
220R
R1A
220R
D3B
D3A
R11B
4K7
R11A
4K7
V3B
BC556
V3A
BC556
T2
IC1A
78L05
C1B
820P
R36B
500R
D1B
R6B
150R
R15B
R22
R14B
2K2
R13B
R22
R12B
2K2
R15A
R22
R14A
2K2
R13A
R22
R12A
2K2
C1A
820P
R6A
150R
D1A
R36A
500R
V2B
V2A
V5B
V5A
V4B
V4A
V1B
V1A
R7B
10R
R7A
10R
R8B
470R
R8A
470R
R9B
1K
R9A
1K
R5B
150R
R5A
150R
R4B
1K
R4A
1K
R3B
220R
R3A
220R
R2B
220R
R2A
220R
R10A
1K
R10B
1K
IC1B
78L05
V7A V8A
R18A
2K2
R19A
R22
R20A
2K2
R21A
R22
V7B V8B
R18B
2K2
R19B
R22
R20B
2K2
R21B
R22
V6A
V6B
R17B
R22
R17A
R22
R16A
2K2
R16B
2K2
V9A
V9B
R23A
R22
R23B
R22
R22A
2K2
R22B
2K2
R40B
1K
R41A
10k NTC
R41
NOT USED
C
X4 TO FAN
X3 TO PCB6200 X2
X2 TO PCB6200 X1
X1 TP PCB6203
PCB6202
X4 TO FAN
X3 TO PCB6200 X4
X2 TO PCB6200 X3
X1 TO PCB6136
PCB6201
R34 =2K2
R24,R26,R28,R30,R32,
R35 = 0.22R
R25,R27,R29,R31,R33,
V10-V15 = TIP35C
DCM500
PCB6202
PCB6201
CD6201-1
DCM500 POWER PCB
FAN
2
1
X4
5
5
4
3
X3
2
1
X3
5
4
3
2
1
X1
5
4
3
2
1
X2
FAN
2
1
X43
4
X3 TIP41C
24V6
5
35V2
1
X3
3
2
1
X1
5
4
3
1
X2
2
+35V
+35V
SBG
1
100VAC
COM
11 X TIP35C
11 X TIP35C
70AC
4 OHM
2

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Date: 6-May-2003 Sheet of
File: C:\Protel Files\CDTRAX\CD6200-14.DDB Drawn By:
VDD
P4
10K
VDD
R51
1K
R42
1K D27
D13
VCC
V6
BC546
R55
10K
R56
10K
IC2B
LM358
VCCVCC
AGND
AGND
AGND
VDD
R31
10k
R30
10K
VCC
R29
10K
V5
BC546
C11
22u
VDD
IC5
7805
VCC
VCC
VDD
R36
10K
R13
10K
V7
BC546
C33
4u7
R53
1K
C5
2u2
P2
47K
R12
100R
C3
10u
R11
390R
R10
1K
R9
5K6
D2
D1
R272M2R16 2M2
R17
47K
R14
22R
C18
4u7
C16
100u
C15
100u
R34
22K
R33
22K
D4
C8
100P
C23
100P
C6
2u2
C19
47u
V3
BC546
1
2
3
5
6
7
8
4
9
10
11
12
14
15
16
13
IC3A
SA571
C17
2u2
C14
47P
C13
47P
R28
100K
R15
100K
C12
2u2
C10
2u2
R25
10K
R24
10k
R23
10K
R22
10k
R21
39k
R20
10k
R19
100K
R18
1K
IC4B
LM833-B
IC4A
LM833-A
C4
2u2
C7
100u
IC1
7815
P1
2K
C2
2u2
C1
2u2
V2
BC639
V1
BC639
T1B
T1A
R8
100R
R7
100R
R6
680R
R5
680R
R4
10K
R3
10K
R2
68K
R1
68K
IC2A
LM358
R35 33K LK2
LK3
0R
C9
.47u
C26
4u7
LK4
0R
VDD
1
GP5
2
GP4
3
GP3
4GP2 5
GP1 6
GP0 7
VSS 8
IC6
PIC12C509
D26
D24
D23
D22
D21
D20
D19
D18
D17
R48
1K
R49
10K
LK6
0R
R46
1K2
R45
2K7
D25
R41
D31
C35
4u7
VCC
R43
470R
R44
1K
C32
4u7 V4
BC556
D10
D16
V8
BC556
R26
10K
VCC
V9
BC556
R32
470K
C20
47u
PROTECT
Desc
2.
3.
4.
5.
6.
7.
Pin
GP5-IN = THRML SENS
GP4-IN = FAN SENSE
GP3-IN = I LIMIT
GP2-OUT = PRTCT/MUTE
GP1-OUT = FAN CON
I/O
Power Current Limit
Fan ControlThermal SenseProtect/On Indicator
Battery IndicatorVU Display
Mute/Limiter/DriveMicroprocessor
X4/1
X2/6
(N/C)
IC6/P2
IC6/P3
X4/3X2/4
FAN CONTROL
POWER
X2/5
X4/4
IC6/P5
IC6/P6
AGND
IC6/P7
IC6/P4
IC6/P5
(N/C)
D
X4/2
X4/6
X3/1
X3/3
X3/5
X3/2
X3/4
X1/3
X2/2
X2/1
X1/2
X1/1
X4/5
GND
8V2
SBG
1
16VDC
X5
1
DCM DRIVER
CD6200-1
X2/3
LN3915
-21
-15
-9
-6
-3
0
+3DB10
11
12
13
14
16
18
1
42
8
7
6
5
93
17
15 -12
-18
-25
IC7
X1/4
X1/5
MAINS
FAIL
*
*R41=15K=DCM120/500
R41=12K=DCM 250
GP0-OUT = 1/2VCC CON

DCM500 Power Supply Components List
Designato Part Type Description Manufacturer's code
BR1 KBPC3504 Bridge recitfier 600V/35A 2134800356
BR3 KBPC3504 Bridge recitfier 600V/35A 2134800356
C1 15000uF Electrolytic Capacitor 50V 2121250153
C2 15000uF Electrolytic Capacitor 50V 2121250153
C3 15000uF Electrolytic Capacitor 50V 2121250153
C4 15000uF Electrolytic Capacitor 50V 2121250153
C5 4u7 Electrolytic Capacitor 50V 2121250479
C6 4u7 Electrolytic Capacitor 50V 2121250479
C7 10u Electrolytic Capacitor 50V 2121230100
C8 0.15u Metalised Poly Capacitor 275V 2124290158
D1 40A Stud Mount Rectifier Diode 40A 2135940100
D2 1N4007 Rectifier Diode 2133440007
D3 12V Zener diode 1W 12V 2136010120
F1 *** Fuse, refer user manual
F2 35A Fuse, 35A 3AG 2541120350
F3 35A Fuse, 35A 3AG 2541120350
R1 4K7 Resistor, metal film .5W 9111590472
R2 47R PW5 Wire Wound resistor 5W 2111450470
R3 100R PW10 Wire wound resistor 10w 2111460101
RY1 Relay Relay 12V 16A SPDT 2522220793
S1 Switch Rocker Switch DPST 2511210155
T1 Power transformer 2651991355
V1 BC639 Transistor TO92 2144200639

DCM Series Drive Stage Component List
Designato Part Type Description Manufacturer's Code
C1 2u2 Electrolytic Capacitor 35V 2121260229
C10 2u2 Electrolytic Capacitor 35V 2121260229
C11 22u Electrolytic Capacitor 35V 2121250220
C12 2u2 Electrolytic Capacitor 35V 2121260229
C13 47P Multi layer ceramic capacitor 2127181470
C14 47P Multi layer ceramic capacitor 2127181470
C15 100u Electrolytic Capacitor 16V 2121210101
C16 100u Electrolytic Capacitor 16V 2121210101
C17 2u2 Electrolytic Capacitor 35V 2121260229
C18 4u7 Electrolytic Capacitor 35V 2121250479
C19 47u Electrolytic Capacitor 35V 2121230470
C2 2u2 Electrolytic Capacitor 35V 2121260229
C20 47u Electrolytic Capacitor 35V 2121230470
C23 100P Multi layer ceramic capacitor 2127181101
C26 4u7 Electrolytic Capacitor 35V 2121250479
C3 10u Electrolytic Capacitor 35V 2121230100
C32 4u7 Electrolytic Capacitor 35V 2121250479
C33 4u7 Electrolytic Capacitor 35V 2121250479
C35 4u7 Electrolytic Capacitor 35V 2121250479
C4 2u2 Electrolytic Capacitor 35V 2121260229
C5 2u2 Electrolytic Capacitor 35V 2121260229
C6 2u2 Electrolytic Capacitor 35V 2121260229
C7 100u Electrolytic Capacitor 16V 2121210101
C8 100P Multi layer ceramic capacitor 2127181101
C9 .47u Metalised Poly Capacitor 63V 2124262472
D1 1N4148 Rectifier Diode 2133440148
D10 L-LED(red) LED 3.0mm 2137200003
D13 L-LED(red) LED 3.0mm 2137200003
D16 1N4148 Rectifier Diode 2133440148
D17 L-LED(red) LED 3.0mm 2137200003
D18 L-LED(red) LED 3.0mm 2137200003
D19 L-LED(grn) LED 3.0mm 2137500003
D2 1N4148 Rectifier Diode 2133440148
D20 L-LED(grn) LED 3.0mm 2137500003
D21 L-LED(grn) LED 3.0mm 2137500003
D22 L-LED(grn) LED 3.0mm 2137500003
D23 L-LED(grn) LED 3.0mm 2137500003
D24 L-LED(grn) LED 3.0mm 2137500003
D25 L-LED(grn) LED 3.0mm 2137500003
D26 L-LED(grn) LED 3.0mm 2137500003
D27 L-LED(grn) LED 3.0mm 2137500003
D31 1N4148 Rectifier Diode 2133440148
D4 1N4007 Rectifier Diode 2133440007
IC1 7815 Voltage regulator I.C TO220 2151370815
IC2A LM358 Comparator, dual IC DIP 2152800358
IC2B LM358 Comparator, dual IC DIP 2152800358
IC3 SA571 Compander IC DIP 2153600571
IC4A LM833-A Dual op-amp IC DIP 2157800833
IC4B LM833-B Dual op-amp IC DIP 2157800833
IC5 7805 Regulator IC TO92 2151270805
IC6 PIC12C509 Programmable IC DIP 2159082509
LK2 0R Link, zero ohms 9111590000
LK3 0R Link, zero ohms 9111590000

LK4 0R Link, zero ohms 9111590000
LK6 0R Link, zero ohms 9111590000
P1 2K Cermet, preset Horizontal 2112210202
P2 47K Potentiometer 16mm 2112211473
P4 10K Cermet, preset Horizontal 2112210103
R1 68K Resistor, metal film .5W 9111590683
R10 1K Resistor, metal film .5W 9111590102
R11 390R Resistor, metal film .5W 9111590391
R12 100R Resistor, metal film .5W 9111590101
R13 10K Resistor, metal film .5W 9111590103
R14 22R Resistor, metal film .5W 9111590220
R15 100K Resistor, metal film .5W 9111590104
R16 2M2 Resistor, metal film .5W 9111590225
R17 47K Resistor, metal film .5W 9111590473
R18 1K Resistor, metal film .5W 9111590102
R19 100K Resistor, metal film .5W 9111590104
R2 68K Resistor, metal film .5W 9111590682
R20 10k Resistor, metal film .5W 9111590103
R21 39k Resistor, metal film .5W 9111590393
R22 10k Resistor, metal film .5W 9111590103
R23 10K Resistor, metal film .5W 9111590103
R24 10k Resistor, metal film .5W 9111590103
R25 10K Resistor, metal film .5W 9111590103
R26 10K Resistor, metal film .5W 9111590103
R27 2M2 Resistor, metal film .5W 9111590105
R28 100K Resistor, metal film .5W 9111590104
R29 10K Resistor, metal film .5W 9111590103
R3 10K Resistor, metal film .5W 9111590103
R30 10K Resistor, metal film .5W 9111590103
R31 10k Resistor, metal film .5W 9111590103
R32 470K Resistor, metal film .5W 9111590474
R33 22K Resistor, metal film .5W 9111590223
R34 22K Resistor, metal film .5W 9111590223
R35 33K Resistor, metal film .5W 9111590333
R36 10K Resistor, metal film .5W 9111590103
R4 10K Resistor, metal film .5W 9111590103
R41 15K*Resistor, metal film .5W 9111590153
R41 12K** Resistor, metal film .5W 9111590123
R42 1K Resistor, metal film .5W 9111590102
R43 470R Resistor, metal film .5W 9111590471
R44 1K Resistor, metal film .5W 9111590102
R45 2K7 Resistor, metal film .5W 9111590272
R46 1K2 Resistor, metal film .5W 9111590122
R48 1K Resistor, metal film .5W 9111590102
R49 10K Resistor, metal film .5W 9111590103
R5 680R Resistor, metal film .5W 9111590681
R51 1K Resistor, metal film .5W 9111590102
R53 1K Resistor, metal film .5W 9111590102
R55 10K Resistor, metal film .5W 9111590103
R56 10K Resistor, metal film .5W 9111590103
R6 680R Resistor, metal film .5W 9111590681
R7 100R Resistor, metal film .5W 9111590101
R8 100R Resistor, metal film .5W 9111590101
R9 5K6 Resistor, metal film .5W 9111590562
T1A RF2285A Driver Transformer DCM-120-24

T1B RF2285B Driver Transformer DCM-120-24
V1 BC639 Transistor TO92 2144200639
V2 BC639 Transistor TO92 2144200639
V3 BC546 Transistor TO92 2144200546
V4 BC556 Transistor TO92 2144200556
V5 BC546 Transistor TO92 2144200546
V6 BC546 Transistor TO92 2144200546
V7 BC546 Transistor TO92 2144200546
V8 BC556 Transistor TO92 2144200556
V9 BC556 Transistor TO92 2144200556
Please note *DCM120-DCM500
Please note ** DCM250

DCM500 Output stage Components List
Designato
r
Part Type Description Manufacturer's Code
C1A 820P Multi layer Ceramic Capacitor 2127181821
C1B 820P Multi layer Ceramic Capacitor 2127181821
D1A 1N4007 Rectifier Diode 2133440007
D1B 1N4007 Rectifier Diode 2133440007
D2A 1N4007 Rectifier Diode 2133440007
D2B 1N4007 Rectifier Diode 2133440007
D3A 1N4007 Rectifier Diode 2133440007
D3B 1N4007 Rectifier Diode 2133440007
D4 1N4007 Rectifier Diode 2133440007
IC1A 78L05 Voltage regulator IC TO92 2151270805
IC1B 78L05 Voltage regulator IC TO92 2151270805
R10A 1K Resistor, Metalfilm .5W 9111590102
R10B 1K Resistor, Metalfilm .5W 9111590102
R11A 4K7 Resistor, Metalfilm .5W 9111590472
R11B 4K7 Resistor, Metalfilm .5W 9111590472
R12A 2K2 Resistor, Metalfilm .5W 9111590222
R12B 2K2 Resistor, Metalfilm .5W 9111590222
R13A R22 Wire wound resistor 5W 2111450228
R13B R22 Wire wound resistor 5W 2111450228
R14A 2K2 Resistor, Metalfilm .5W 9111590222
R14B 2K2 Resistor, Metalfilm .5W 9111590222
R15A R22 Wire wound resistor 5W 2111450228
R15B R22 Wire wound resistor 5W 2111450228
R16A 2K2 Resistor, Metalfilm .5W 9111590222
R16B 2K2 Resistor, Metalfilm .5W 9111590222
R17A R22 Wire wound resistor 5W 2111450228
R17B R22 Wire wound resistor 5W 2111450228
R18A 2K2 Resistor, Metalfilm .5W 9111590222
R18B 2K2 Resistor, Metalfilm .5W 9111590222
R19A R22 Wire wound resistor 5W 2111450228
R19B R22 Wire wound resistor 5W 2111450228
R1A 220R Resistor, Metalfilm .5W 9111590221
R1B 220R Resistor, Metalfilm .5W 9111590221
R20A 2K2 Resistor, Metalfilm .5W 9111590222
R20B 2K2 Resistor, Metalfilm .5W 9111590222
R21A R22 Wire wound resistor 5W 2111450228
R21B R22 Wire wound resistor 5W 2111450228
R22A 2K2 Resistor, Metalfilm .5W 9111590222
R22B 2K2 Resistor, Metalfilm .5W 9111590222
R23A R22 Resistor, Metalfilm .5W 2111450228
R23B R22 Wire wound resistor 5W 2111450228
R2A 220R Resistor, Metalfilm .5W 9111590221
R2B 220R Resistor, Metalfilm .5W 9111590221
R36A 500R Cermet, preset horizontal 2112210501
R36B 500R Cermet, preset horizontal 2112210501
R37 0R Link, zero ohms .5W 9111590000
R38A 47k Resistor, Metalfilm .5W 9111590473
R38B 47k Resistor, Metalfilm .5W 9111590473
R39A 10R Resistor, Metalfilm .5W 9111590100
R39B 4K7 Resistor, Metalfilm .5W 9111590472
R3A 220R Resistor, Metalfilm .5W 9111590221
R3B 220R Resistor, Metalfilm .5W 9111590221
R40 1K Resistor, Metalfilm .5W 9111590102

R40B 1K Resistor, Metalfilm .5W 9111590102
R41
R41A 100D
R42B 10R Resistor, Metalfilm .5W 9111590100
R4A 1K Resistor, Metalfilm .5W 9111590102
R4B 1K Resistor, Metalfilm .5W 9111590102
R5A 150R Resistor, Metalfilm .5W 9111590151
R5B 150R Resistor, Metalfilm .5W 9111590151
R6A 150R Resistor, Metalfilm .5W 9111590151
R6B 150R Resistor, Metalfilm .5W 9111590151
R7A 10R Resistor, Metalfilm .5W 9111590100
R7B 10R Resistor, Metalfilm .5W 9111590100
R8A 470R Resistor, Metalfilm .5W 9111590471
R8B 470R Resistor, Metalfilm .5W 9111590471
R9A 1K Resistor, Metalfilm .5W 9111590102
R9B 1K Resistor, Metalfilm .5W 9111590102
T2
V16 TIP41C Transistor TO220 2141300041
V1A TIP41C Transistor TO220 2141300041
V1B TIP41C Transistor TO220 2141300041
V2A IRF9520 Mosfet, hexfet 2142309520
V2B IRF9520 Mosfet, hexfet 2142309520
V3A BC556 Transistor T092 2141600035
V3B BC556 Transistor T092 2141600035
V4A TIP35C Transistor TOP-3 2141600035
V4B TIP35C Transistor TOP-3 2141600035
V5A TIP35C Transistor TOP-3 2141600035
V5B TIP35C Transistor TOP-3 2141600035
V6A TIP35C Transistor TOP-3 2141600035
V6B TIP35C Transistor TOP-3 2141600035
V7A TIP35C Transistor TOP-3 2141600035
V7B TIP35C Transistor TOP-3 2141600035
V8A TIP35C Transistor TOP-3 2141600035
V8B TIP35C Transistor TOP-3 2141600035
V9A TIP35C Transistor TOP-3 2141600035
V9B TIP35C Transistor TOP-3 2141600035
2141600035

DCM500 Major Components price list
Part Description Manufacturer code in house AUD$
PCB's
Power Supply PCB Capacitor mount PCB S5728MDCM50003 $47.13
Input Input PCB assy S5728MDCM50005 $10.05
Output Left Output PCB assy S5728MDCM50001 $66.79
Output Right Output PCB assy S5728MDCM50002 $62.75
Display-front PCB Display PCB S5728MDCM50006 $33.44
Relay PCB Relay slow start PCB S5728MDCM50004 $8.18
Transformers
230/240VAC Mains 230/240V 2561991355 $79.36
Output Output 2651991357 $65.99
Fuse 35 amp DC rail fuse 2541120350 $0.51
Bridge Assembly Bridge Assembly S5728MDCM50023 $27.31
Drive transformer Drive Transformer S5728MDCM50007 $2.30
Semiconductors
TIP35C NPN TO3P transistor 2141600035 TIP36C $3.60
TIP41C PNP TO220 transistor 2141300041 TIP42C $2.01
BC639 NPN TO92 2144200639 S7007 $0.16
BC640 PNP TO92 2144200640 S7008 $0.16
BD140 PNP TO92 2141400140 $0.22
BD139 NPN TO92 2141400139 S7009 $0.22
LM1458 IC Dual Op amp 2152801048 LM1458 $0.27
LM833N IC Dual Op amp 2157800833 LM833 $1.05
LM358 IC Dual Op amp 2152800358 LM358 $1.05
LM78L05 IC Regulator 2151270805 LM7805 $0.17
LM7815 IC Regulator 2151370815 LM7815 $0.52
LM7818 IC Regulator 2151370818 LM7818 $0.52
10k Thermistor 2111911103 $0.80
IRF 9530 Mosfet IRF9530 2142309530 $3.49
PIC 12C509 PIC 12C509A, 8 PIN 2159082509 $4.17
LED blue 2137600003 $0.13
KBPC 3506 Bridge rectifier 35A 2134800356 $7.49
SA 571N Compander 2153600571 $3.69
LM 3915N LED driver IC 2156603915 $3.77
Switches & Pots
Volume Pot Input attenuator 2112211473 $0.56
Power switch Rocker switch 2511210155 $1.39