I have just completed my first printed circuit board kit, a voice changer kit from Velleman. It looked pretty good all told as I studied-up on soldering techniques for PC boards beforehand. However, as a newbie, I had to make a mistake somewhere.
The on/off LED light comes on when the 9V power is switched on but there is no modulated output going to the speaker. There is output at the speakers, a fairly constant 6V or so, but it doesn't change no matter how I adjust the volume, the mic sensitivity or the vibrato\pitch up\pitch down\robot buttons.
Shouldn't I be getting a modulated voltage at the speaker outputs?
Although all the other connections seem to be adequate, I certainly botched an LED connection on the board by manhandling it too much when it didn't sit in the correct position and I damaged the trace and the film over the trace. The LED is supposed to indicate "modulation" and seems to be isolated but I can't really say that for sure. A nube issue no doubt.
What would cause the constant output voltage and would the LED affect the whole PC board's performance? The diagram for can be found at:
http://www.vellemanusa.com/downloads/0/minikits/manuals/manual_mk171.pdf. I don't think I damaged any of the copper or film near any other connections. Also, if it matters, I cleaned it with isopropyl alcohol and a toothbrush applying the treatment about 5 times. Then I blew it clean with compressed air and held it uner a hot light for a few minutes.
What did I do wrong (if possible to determine cause(s)) and can I do anything about it now with this board?
Eric
The on/off LED light comes on when the 9V power is switched on but there is no modulated output going to the speaker. There is output at the speakers, a fairly constant 6V or so, but it doesn't change no matter how I adjust the volume, the mic sensitivity or the vibrato\pitch up\pitch down\robot buttons.
Shouldn't I be getting a modulated voltage at the speaker outputs?
Although all the other connections seem to be adequate, I certainly botched an LED connection on the board by manhandling it too much when it didn't sit in the correct position and I damaged the trace and the film over the trace. The LED is supposed to indicate "modulation" and seems to be isolated but I can't really say that for sure. A nube issue no doubt.
What would cause the constant output voltage and would the LED affect the whole PC board's performance? The diagram for can be found at:
http://www.vellemanusa.com/downloads/0/minikits/manuals/manual_mk171.pdf. I don't think I damaged any of the copper or film near any other connections. Also, if it matters, I cleaned it with isopropyl alcohol and a toothbrush applying the treatment about 5 times. Then I blew it clean with compressed air and held it uner a hot light for a few minutes.
What did I do wrong (if possible to determine cause(s)) and can I do anything about it now with this board?
Eric