Pete Cornish - CC-1 Crunch
- aion
- Solder Soldier
Information
The CC-1 is an original circuit by Pete Cornish, or at least as original as you can get with op-amps and diodes, but not a clone of anything else.
He had said the OC-1 was an original design, and he was definitely correct to say so, so I decided to take a chance that the CC-1 was worth tracing too. Expensive... but someone had to do it!
Schematic:
Full tracing journal here:
https://aionelectronics.com/blog/tracin ... nish-cc-1/
PCB available here:
https://aionelectronics.com/project/cep ... overdrive/
He had said the OC-1 was an original design, and he was definitely correct to say so, so I decided to take a chance that the CC-1 was worth tracing too. Expensive... but someone had to do it!
Schematic:
Full tracing journal here:
https://aionelectronics.com/blog/tracin ... nish-cc-1/
PCB available here:
https://aionelectronics.com/project/cep ... overdrive/
- andy-h-h
- Breadboard Brother
Information
I knocked out a quick layout this morning - keen to get building.
- aion
- Solder Soldier
Information
Yep, will be a little higher current draw but on paper it’s a better audio chip. Should work fine!
- Ben N
- Cap Cooler
Cornish says this:
"The CC-1™ features two fixed low gain Soft Clipping Stages preceded by a variable gain (maximum +22dB) linear preamp to compensate for low output pickups and provide extra drive to the soft clipping stages if required."
Huh? Looking at the schematic, where is this +22db linear preamp? All I see upstream of the first clipping stage is an emitter follower, aka "my well established Class A input buffer".
Also interesting is that the first clipping stage is non-inverting, while the second is inverting. This, along with the inverting EQ/output stage makes the output in phase with the input, but I guess there is more at work, such as not letting the clean signal all the way through unmolested the way non-inverting soft-clipping opamp stages, with their floor of unity, do.
"The CC-1™ features two fixed low gain Soft Clipping Stages preceded by a variable gain (maximum +22dB) linear preamp to compensate for low output pickups and provide extra drive to the soft clipping stages if required."
Huh? Looking at the schematic, where is this +22db linear preamp? All I see upstream of the first clipping stage is an emitter follower, aka "my well established Class A input buffer".
Also interesting is that the first clipping stage is non-inverting, while the second is inverting. This, along with the inverting EQ/output stage makes the output in phase with the input, but I guess there is more at work, such as not letting the clean signal all the way through unmolested the way non-inverting soft-clipping opamp stages, with their floor of unity, do.
- aion
- Solder Soldier
Information
This is correct, we went back and measured them and it turns out that those two were in fact 11k - which has the same 5-band color code as the much more common 1k2, which is also used elsewhere in the circuit. The Cepheus build docs were updated awhile back to reflect this, but I haven't posted a new trace schematic yet.