MYCOMKITS MK-137B User manual

Microcontroller & Electronics Hobby Kits Shop
MYCOMKITS DOT COM
www.MYCOMKITS.com
MK-137B Change Your Voice to Robot, Lady, Gentleman Voice!
With Microphone, Line-In, Amplifier, Voice Changer Kit
MYCOMKITS.COM's ”MK-137B Change Your Voice to
Robot, Lady, Gentleman Voice! With Microphone, Line-In,
Amplifier, Voice Changer Kit” is a voice changer kit
which uses sound modulator HT8950 chips of Holtek.
HT8950 is voice frequency conversion IC which built in
the amplifier for microphones. This raises the frequency
of the sound inputted from an attached microphone or
line-in into 4/3 time, 8/5 time, and twice, or lowers it
into 8/9 time, 4/5 time, and 2/3 time conversely. This
can change the sound of your voice and PC, or an
electronic instrument into high voice or low voice.
Furthermore, this can change your voice also into a
robot's voice. Moreover, this can make a pleasant effect
from shaking ±8 Hz of each sound during playing by a
vibrato function.
Therefore, you can include this in a stuffed-animal suit,
a doll, or a robot, you can utter pleasant voice, you can
connect with electronic instruments, such as an electric
guitar, using line-in, or you can put it in voice generating
equipment and use this.
Note: A power supply and a speaker are not attached to
a kit. Prepare separately by yourself.
SPECIFICATIONS & FEATURES:
Supply Voltage
From DC6V to 12V (Notes:
neither a battery cell nor an
electric power supply is attached.)
Prepare separately by yourself.)
Sampling Frequency
8 kHz
Vibrato function
±8-Hz vibrato function built-in
Frequency modulation
You can adjust three steps at a
time up and down and Normal.
4/3, 8/5, 2, 1, 8/9, 4/5, 2/3 times.
(Set up with a push-button switch
or a DIP switch)
AD, DA converter
8-bit AD, DA converter built-in.
Excessive input display LED
When input volume is large,
it lights up.
(When the light is switched on,
distortion and an oscillation may
occur)
Switches for Setup
Set up modulation frequency with
four push-button switches and
one DIP switch
Input (two types)
Condenser microphone Change it
with a slide switch. 2. Line-in
(terminal block)
Output
It can drive 8ohms of output
speaker directly (about 1W)
(Amplifier built-in by LM386.
Since distortion becomes large
although a gain can be chosen 200
times, always use it with 20
times. )( Note: a speaker is not
attached in this product.) We
recommend to use beyond 2W
speaker to get better sound)
How to Use:
Connect Power Supply: Connect the battery or DC
power supply of +6V to +12V to the terminal block
(screw type terminal) J2 or the DC jack J1. When you
use DC jack, use a plug that has 2.1mm shaft diameter
with positive voltage and 5.5m outside diameter. (Notes:
A power supply is not included in a product).
Connect speaker: Connect an 8-ohm speaker to the
terminal block J5. (Notes: A speaker is not included in a
product).
Setting for conversion frequency-setting switch:
DIP switch S2 (use three of four switches)
SW2
SW1
SW0
Behavior
Modulatio
n Degree
1
1
1
Push switch,
TGU、TDG、
ROBOT Available
Refer to
Note
1
1
0
UP 3
X 2
1
0
1
UP 2
X 8/5
1
0
0
UP 1
X 4/3
0
1
1
Normal
X 1
0
1
0
Down 1
X 8/9
0
0
1
Down 2
X 4/5
0
0
0
Down 3
X 2/3
Set to the frequency which wishes SW0 of DIP switch
S2, SW1, and SW2 according to the following table.
When a switch is OFF, it means "1". "0" (zero) means
ON. (One of four switches is a to be determined). If a
power supply is turned ON with all "1", it will become
ROBOT mode.
Push-button switches S4 and S5 (They are available
only when all DIP switches are "1") :
You can raise
frequency by push-button switch UPWARD (S5) from
lowest frequency for every step. On the contrary, you
can lower frequency for every step from the highest
frequency by DOWNWARD (S4).
Push-button switch S3 (available, only when all DIP
switches are "1"): It changes your voice into a robot's
voice by push-button switch ROBOT (S3). When the
whole of SW2/1/0 is 1 turning ON, it becomes ROBOT
sound automatically.
Push-button switch S6:
If push-button switch VIBRATO
(S6) is pushed, it will shake ±8 Hz of the present
frequency.
1/4

Microcontroller & Electronics Hobby Kits Shop
MYCOMKITS DOT COM
www.MYCOMKITS.com
MK-137B Change Your Voice to Robot, Lady, Gentleman Voice!
With Microphone, Line-In, Amplifier, Voice Changer Kit
Notes:
Only when DIP switch S2 is all OFF state (all
1). UPWARD, DOWNWARD, and a ROBOT switch are
effective (refer to the table).
Power on:
Slide the slide switch S1 to ON. The sound
inputted from a microphone or line-in is modulated, and
it is outputted from a speaker.
Input change:
Choose whether you use an attached
microphone or line-in with the slide switch S7.
Line-in connection:
When using line-in, connect the
output of PC or an electronic device, etc. Be cautious
about the polarity. Connect the ground of PC and an
electronic device with one signal wire (printed on the
board).
Note:
If input volume is large, excessive input display
LED may light up, and distortion and an oscillation (high
noise sound) may occur. When it oscillates, turn OFF a
power supply, and turn ON a power supply again. In the
case of high tone and low tone, regardless of input
volume, distortion may occur. When the microphone
receives the sound of the speaker, the phenomenon
"howling" such as "gaaa peep" occurs. Use it so that
the sound of a speaker does not go into a microphone
by any means. A noise may occur in line-in.
Assembly:
Check to see if all of the parts in the parts list are
included before assembly. Solder the lowest height
components first. Then add the taller components.
Solder a resistor and a diode first, then a switch and IC
socket, then a capacitors.
Note: Mount the capacitor
C17 in IC "U2" socket. Mount it before soldering IC
socket.
Be careful to solder polar parts (diode,
electrolytic capacitor, LED, transistor, 3 terminal
regulator) that they have polarity and direction.
Note:
Since C12 is not polar although they are electrolytic
capacitors, you can disregard polar printing on a printed
circuit board, and mount them at any direction. The plus
side of C4 is a terminal near U3.
Align the cathode (flat
part or shorter lead) of the LED with the flat line of the
PCB legend and solder them together. Mount all the
parts according to white printing (silk print) on a printed
circuit board fundamentally. Don't solder IC directly, but
solder IC socket, and insert IC in it. Although two kinds
of connectors, J1 and J2, are attached as a connector
for power supplies, you should attach only one of them
which you will use it in order to prevent connecting an
accidentally different power supply simultaneously. You
can use a microphone on a board, attaching it directly.
Or you can use it, attaching via a vinyl wire (however,
when you use 15 cm length or more, use a shielded wire
to reduce noise).
If you attach a jumper pin (not
included) to the J4 pin header, the gain will be 200
times but since the distortion will increase, please do
not install. (J4 pin header, C16 condenser, pin socket
for 200 times gain is not included) Refer to the
“Convenient notes for electrical work” on the website
for details on how to attach components, how to view
PCB silk printings, how to interpret resistance values,
and so on.
Refer to the following photo for assembly.
Notice on use (important):
If the sound from a speaker goes into a microphone, a
howling phenomenon (oscillation) will occur (big annoying
sound).
When especially the gain of amplifier is large, be
careful.
What To Do If It Does Not Work
Poor soldering is the most likely reason. Check all solder
joints carefully under a good light. Check that all
components are in their correct position on the PCB.
CONTACT US
The data sheet of HT8950 made from HOLTEK (Taiwan)
is downloadable from the following web sites.
http://www.holtek.com/english/docum/consumer/8950.
htm
Access the following MYCOMKITS.com website below
for related detailed documents.
http://www.mycomkits.com
Contact us at the email address below if you have any
questions.
[e-mail]
Parts List-MK-137B
Resistors (5%, 1/4W)
2.2kΩ (red, red, red) R1 ...........................................................2
470R (yellow, purple, brown) R3.........................................1
4.7K (yellow, purple, orange) R4,8 ....................................1
51K (green, brown, orange) R5 ...........................................1
22K (red, red, orange) R6......................................................1
33k (orange, orange, orange) R7, 11 ....................................2
100k (brown, black, yellow) R8 ..........................................1
47K (yellow, purple, orange) R9
............................................................................................................15
10 (green, brown, brown) R10 .............................................1
10 (brown, black, black) R13 ..............................................1
U2 ソケットと
C17 コンデンサー U3 3 端子レギュレータ
S2 ディップスイッチ
2/4

Microcontroller & Electronics Hobby Kits Shop
MYCOMKITS DOT COM
www.MYCOMKITS.com
MK-137B Change Your Voice to Robot, Lady, Gentleman Voice!
With Microphone, Line-In, Amplifier, Voice Changer Kit
Capacitor
0.33uF (334) C1 ............................................................................1
100uF polar C2, 20 ......................................................................2
0.1uF(100nF, 104）C3, 5, 6, 7, 8, 10, 13, 15, 21 .............9
47uF polar C4................................................................................1
22uF polar C9................................................................................1
33nF (0.033uF, 333) C11
.............................................................................................................2.2
uF non polar C12..........................................................................1
4.7uF polar C14.............................................................................1
0.1uF (100nF, 104, Note: 2.5mm spacing) C17.................1
47nF (0.047uF, 473) C18...........................................................1
470uF polar C19 ...........................................................................1
Semiconductors
1N4007 diode D1, 2.....................................................................2
LED D3 .............................................................................................1
Sound Modulator IC HT8950 U1............................................1
OP Amp IC LM386 U2................................................................1
Voltage Regulator TA48033 (or equivalent) U3...............1
Other
10kΩ semifixed pot R12...........................................................1
Condenser microphone M1
.............................................................................................................Sli
de Switch S1, 7.............................................................................2
DIP Switch (4 circuit) S2..........................................................1
Tactile Switch (Push Switch) S3, 4, 5, 6............................4
IC socket 18pin (for U1)............................................................1
IC socket 8pin (for U2) .........................................................1
DC jack connector J1................................................................1
Terminal block (bipolar) Screw Terminal) J2, 3, 5..........3
MK-137B print-circuit board (K314) (size: approx.
73.4×73mm)..................................................................................1
Note:
Mount the capacitor C17 in IC "U2" socket.
Mount it before soldering IC socket.
Since C12 and C16 has no polarity although they are
electrolytic capacitors, you can disregard polar printing
on a printed circuit board, and mount them at any
direction.
J4 connector, C16 condenser, jumper pins are printed
on the board but their parts are not included. When
installing it, the gain becomes 200 times, but please do
not install as distortion becomes large. There are cases
where they are incorrectly attached.
3/4

Microcontroller & Electronics Hobby Kits Shop
MYCOMKITS DOT COM
www.MYCOMKITS.com
MK-137B Change Your Voice to Robot, Lady, Gentleman Voice!
With Microphone, Line-In, Amplifier, Voice Changer Kit
4/4