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MK-137B Change Your Voice to Robot, Lady, Gentleman Voice!
With Microphone, Line-In, Amplifier, Voice Changer Kit
Only when DIP switch S2 is all OFF state (all
1). UPWARD, DOWNWARD, and a ROBOT switch are
effective (refer to the table).
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.
Choose whether you use an attached
microphone or line-in with the slide switch S7.
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).
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.
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.
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.
Contact us at the email address below if you have any
questions.
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
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