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troubleshooting voice modulator Answered

About four years ago I bought this robot voice kit for a halloween costume:
http://www.kemo-electronic.de/en/Hobby-School/B107-Robot-voice.php
(the scematics are near the bottom of the data sheet)

I never finished it and now that I put it together it's not working.
The signal goes through to the amplifier, but without the modulating happening.
Does anyone know what the problem could be, or if there is a way to narrow it down without desoldering and testing the components individually?

Thanks

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steveastrouk
steveastrouk

8 years ago

Several wire links needed. Did you fit them ? Is the transistor in the right way around ? Are there any solder bridges between pads ?

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Jur
Jur

Reply 8 years ago

Yes, yes, and no =P
All the wire links are there, the transistor is the right way and no solder bridges.

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steveastrouk
steveastrouk

Reply 8 years ago

The easiest thing to do now is borrow an oscilloscope to poke the circuit.

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Jur
Jur

Reply 8 years ago

I don't have access to an oscilloscope =/

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steveastrouk
steveastrouk

Reply 8 years ago

Then use one of the PC audio port based ones. It should be fine for this.