[sdiy] what opamp for "warmth"? (I know, I know...)

brianw brianw at audiobanshee.com
Tue Apr 4 02:50:11 CEST 2023

I'm not aware of any op-amp that are non-linear to the degree that it would be musical. The feedback pretty much serves to linearize the whole circuit.

However, you can "fix" any op-amp by putting a couple of diodes across the input in a way that makes the output track the input in a non-linear way. My first guitar amplifier had diodes in the feedback of the op-amp (as opposed to across the +/- inputs) and that was capable of introduction a great deal of non-linearity, although perhaps a bit more than you're after.

I don't have any circuits to share, but you'll probably have better luck designing something that is supposed to be non-linear, so you can use any decent op-amp, rather than make your product dependent upon a one-in-ten-thousand special op-amp.

Brian Willoughby

On Apr 3, 2023, at 2:18 PM, Neil Harper wrote:
> i have a digital effect that I'd like to "warm up" in the last dry/wet mixing and output buffering stage. So wondering if there's any choice of opamp that might give some favorable non-linearity quality to the output sound. Would be running them with a single supply +9V.
> as for what specs constitute "warmth", I'll leave that up to you.. :)

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