Coach_McGuirk
Member
I built an underminer sub-octave but it's not working properly. It does turn on and make sounds but it's... uh... much more glitchy than the videos I've seen suggests it should be. The glitching is sporadic and seems to occur regardless of the settings (glitch switch up or down and the glitch knob don't seem to reduce or increase the glitchiness very much). The 1-down and 2-down octave switch also doesn't seem to be working properly. And the blend knob doesn't pass much dry signal through; even when it's turned counterclockwise, it's not much dry signal and still a ton of weirdness mixed in. Lastly, the effect comes on strong when I pluck a string, but kind of farts out to silence a half second or second later. Honestly, it sounds pretty cool — like some sort of electronics circus act — but it's not very usable and it's definitely not what I hear when I lookup demo videos of the pedal.
I have checked to make sure that the values of the components are correct, and I've inspected the board pretty closely to make sure there aren't any obvious shorts or other issues. I'm a noob and don't really understand schematics that well, so I'm not sure what the voltages should be, but I've used my multimeter to provide the voltages for each pin below. I turned the 3 pots completely clockwise and flipped both switches up before testing. I have also tried multiple CD4046 ICs with the same result.
1: 8.78
2: 0.0009
3: Oscillates quickly between different voltages
4: 6.72
5: 0
6: 0
7: 0
8: 0
9: 0
10: 0.182 (sometimes oscillates quickly between different voltages?)
11: Climbs between 0v and 200mV every few seconds
12: 7.57 (sometimes oscillates quickly between different voltages?)
13: 0.184 (sometimes oscillates quickly between different voltages?)
14: 4.42
15: 0.26 (sometimes oscillates quickly between different voltages?)
16: 8.78
Please let me know if I should be testing the IC with the knobs and switches turned to different values.
I have checked to make sure that the values of the components are correct, and I've inspected the board pretty closely to make sure there aren't any obvious shorts or other issues. I'm a noob and don't really understand schematics that well, so I'm not sure what the voltages should be, but I've used my multimeter to provide the voltages for each pin below. I turned the 3 pots completely clockwise and flipped both switches up before testing. I have also tried multiple CD4046 ICs with the same result.
1: 8.78
2: 0.0009
3: Oscillates quickly between different voltages
4: 6.72
5: 0
6: 0
7: 0
8: 0
9: 0
10: 0.182 (sometimes oscillates quickly between different voltages?)
11: Climbs between 0v and 200mV every few seconds
12: 7.57 (sometimes oscillates quickly between different voltages?)
13: 0.184 (sometimes oscillates quickly between different voltages?)
14: 4.42
15: 0.26 (sometimes oscillates quickly between different voltages?)
16: 8.78
Please let me know if I should be testing the IC with the knobs and switches turned to different values.