Dunwich DA-120 on a breadboard

[finebyfine]

Here's my redraw of @Dan M 's schematic based on @Chuck D. Bones's mods/FAC control

edit: corrected R30 to 10K as per Chuck's comment below

 

[Chuck D. Bones]

R30 should be 10K.

This circuit will be noisier than the Viceroy because MOSFETs are noisier than JFETs. Some MOSFETs are very noisy, so it's a good idea to audition Q1 & Q2.

 

[atee103]

with both schematics/boards i made, i get nothing but clean signal

 

[Chuck D. Bones]

Two boards with the same problem: very likely a common cause. # 1 cause of circuit malfunction is workmanship (it was built wrong). Look for incorrect component values. Then measure and report Vss (-9V), pins 1 & 7 on the IC, the source and drain voltages on all of the MOSFETs.

 

[AdrianSunn0)))]

Does your depth knob make a noticeable difference in sound? I can only hear the smallest, barely audible difference between the first and last positions.

 

[Dan M]

Does your depth knob make a noticeable difference in sound? I can only hear the smallest, barely audible difference between the first and last positions.

Yes, it’s pretty noticeable. Did you use the big rotary switch like I did?