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Overdrive Pedal worked great on breadboard but...
Overdrive Pedal worked great on breadboard but...
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Old 20th April 2019, 08:53 PM   #1
JoeTele is offline JoeTele  United States
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Default Overdrive Pedal worked great on breadboard but...

Hi,

I'm not able to figure out why a simple overdrive pedal won't work now that it's off the breadboard and onto a component board. Schematic is here. Attached are both the top and back of the board. I've remeasured every component. I attach a 9v battery with the positive terminal to the red wire into the polarity protection diode and the negative to the blue wire going to the negative side of the filter cap. I've tried 3 different transistors (including 1 that I test using the process here). I've also double and triple checked continuity from the transistor legs to the solder connections at the sockets. Simply but I've got no bias voltage. I put a signal on the input, which hits the base, but the emitter and the collector show nothing on the scope. The collector has the battery's full voltage. Nothing on the emitter and nothing across the 680ohm resistor. Any ideas?

Thanks!

Joe
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Old 24th April 2019, 05:07 AM   #2
leadbelly is offline leadbelly  Canada
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It would help if you marked up the schematic to match what you actually built. For examples, there's no LED and no "polarity protection diode" on the schematic you linked to.
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Old 24th April 2019, 12:55 PM   #3
JoeTele is offline JoeTele  United States
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Thanks Leadbelly!


I actually figured it out. I had wired the base of the transistor to the wrong side of the .022 signal input cap. I should have updated the post.


Thanks again for looking, though.


Joe
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