I have built the kit but is not yet functioning 100% - more like 10%.
An audio signal does come through each input, with a very low output,
with the LP being the lowest (barely audible), BP the loudest. Freq
pot has no effect. Res appears to be functioning. TL071 is doing it's
job, there's just not much coming to it to actually amplify. I have
double checked all component values and orientations, tracks, etc.
Transistors check OK on diode tester. Note that removing the two
non-output 2222 transistors has no effect on sound moving through the
circuit, so I suspect that my problem is in that area.
Any clues or ideas would be greatly appreciated! Thanks.
An audio signal does come through each input, with a very low output,
with the LP being the lowest (barely audible), BP the loudest. Freq
pot has no effect. Res appears to be functioning. TL071 is doing it's
job, there's just not much coming to it to actually amplify. I have
double checked all component values and orientations, tracks, etc.
Transistors check OK on diode tester. Note that removing the two
non-output 2222 transistors has no effect on sound moving through the
circuit, so I suspect that my problem is in that area.
Any clues or ideas would be greatly appreciated! Thanks.