Missing Build Docs / Schematics

The Unchained is an interesting circuit actually. The active notch filter up front makes a variable depth scoop centered at 160Hz, making it more of a bass scoop than a mid scoop. Then comes an asymmetric soft clipper with over 80dB of gain 😲. It becomes very mid-focused at the highest gain settings. After that is a treble-cut Tone control followed by a level control and an inverter to undo the inversion of the Tone stage.

With all of those opamps, the Tone stage could have been Baxandall. Or the treble cut could be passive and use two less opamps.

I'm not convinced that the charge pump is necessary. With the right opamps, headroom does not need to be an issue. Looks like the max output is around 6.5Vp-p.

Another breadboard candidate.
 
There is, give me just a bit and I'll get it posted. I'm working on a couple docs right now so maybe I can get that one done as well.
 
Back
Top