The Pete Cornish SS-3 is one of my favourite overdrives - so I thought I might make another one with a different layout and buffer.
Changes
- Swapped the Cornish buffer for a standard opamp based buffer
- Ran the reference voltage through the spare opamp
- Used a quad opamp instead of 2 x single op amps
PETE CORNISH SS-3 SOFT SUSTAIN WITH BUFER MOD - VERO LAYOUT
this vero is excellent! great job :) I'm having an issue tho...
ReplyDeleteI'm not getting any good audio past Pin 10 on the IC (using a TL074 btw). I couldn't find a schematic for this specific version, but looking at the aion trace, I believe the signal leaving the hi-cut stage and re-entering the IC on Pin 10 for the final boost stage. if i'm not mistaken, I should be getting a significantly boosted signal from Pin 8, right? I've used an audio probe to isolate the problem to that section. any suggestions or thoughts on why that might be happening?
thanks again!!
Hello Brian,
DeleteI haven't done a schematic for this, but you can use the Aion schematic for everything apart from the buffers. I might put one together as a reference.
Correct - you should be getting quite a bit of level from pin 8.
Do you have a multimeter? What voltages do you have on the opamp? If you want to send pics, guitarverop2p (at) gmail.com
Andy
thanks for the quick reply and sorry for my late one! been distracted with some other circuits for a bit.
Deletethese are the voltages i got:
p1 4.19
p2 4.19
p3 1.29
p4 8.3
p5 2.1
p6 4.17
p7 4.17
p8 4.12
p9 4.12
p10 2.75
p11 0
p12 3.97
p13 4.16
p14 4.16
Any of those voltage readings look off? I thought P11 was odd but I'm not familiar enough with the circuit.
Hey no problem - P11 should be 0, as this is V- (Ground). P12 should be the same as P13 and P14, but that's probably not your issue. The rest look OK but I'll confirm.
ReplyDeleteSo you're getting a good signal out of the buffer then? Same level as the input signal? and then all the way through to the + input of the last stage (pin 10)
ReplyDeleteAs a little experiment, try running signal directly into the last stage (via hi-cut 2). You should get a clean boost. If you get a clean boost, it's not the last stage.
no clean boost from hi-cut 2 :( I'm gonna work on a few more circuits in my queue then circle back around to this one and probably just start from scratch. I'll come back and report on it when I do. thanks for your help!
ReplyDeleteOk. I’ve not built this version myself yet - I have made the original versions using my other layouts. It works as it should on LTspice and I’ve checked the layout against the schematic a few times, but I can’t guarantee that I haven’t missed something.
Delete