No Random/Changing Output

[bparsa]

Hi, just finished my build, and I don't seem to be getting any random changing output, no matter what the knob position is set to.

The clock works correctly, the write switch correctly introduces changing voltages, the noise output works, and the pulse output also works. There just isn't any randomness. When I tried to go through the calibration process by clocking with a pulse from a VCO, I don't get any glitch at all in the output, no matter what the trimmer position is set to - it just sounds like a pulse wave.

I'm fairly new to DIY and circuit boards - any ideas on where to start debugging?

Thanks!

[jstamant]

@bparsa Did you get a kit from Thonk, or where did you get your parts from? When you say "the noise output works", do you mean the noise jack is outputting pure white noise?

Most importantly: did you confirm all components are correctly placed? I'm especially concerned about the components around the noise circuit, and the knob circuit with the TL072 and the 4016 quad-bilateral-switch IC.