So I got the wiring issue solved and fired this thing up. Volume, gain and filter all work but I don't get any clipping! Weird!
I checked voltages and everything is spot on except pin 4 of the 308 (not metal can version) isn't absolutely o volts, same with gate of 5458—both are @4mV.
Any ideas where to look?
You can consider 4mv to be 0v.
When you say no clipping you mean when when you turn the soft and hard knobs they do nothing? Remember in the center you will get no clipping.
Cool re 4mV. No distortion, hard or soft just clean signal affected by the vol, gain and filter controls. Nothing from hard, soft, or fat.
Okay. A pic might be a good idea at this point.
Here's components:
(http://imageshack.com/a/img922/7140/wFQ5gD.jpg)
Confirming that the pads marked "PWR" on the board are for .1u caps
Solder side is basically obscured:
(http://imageshack.com/a/img924/3192/dAKAbH.jpg)
W20k and W1M are in correct spots.
I reflowed parts under 6mm pots; still to do under 9mm pots.
So I swapped out the Germ diode and the BS170—both clipping knobs increase volume but still no overdrive or distortion. I'm a bit flummoxed.
You have incorrect resistors in there. 470k instead of 470R. Not sure those are 2M2 resistors, either.
Yaaaaayyy. Just my stupidity! I'll take it! Thanks!
Quote from: madbean on May 18, 2017, 12:54:05 PM
You have incorrect resistors in there. 470k instead of 470R. Not sure those are 2M2 resistors, either.
I hate it when I do that...
Yeah, it's funny that a tiny, tiny factor of 1,000 makes a difference...
Well. i made the same mistake with the 470k vs 470R resistors. The pdf still lists the 2 x 470k in the bom. So i assumed they had to be in there. I had no idea where the 1 x 470R had to go. But problem solved. Maby a good idea to change the document.
Sorry about that. I updated the project doc with the removal of the two 470k listed in the BOM.