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

Jacob Watters jacobwatters at gmail.com
Wed Apr 5 16:59:54 CEST 2023


I like to use a 4069 for that. Just make sure you use schottky diodes to
protect the input. It is good to use on a single power rail too. I have
made little overdrive boxes that are just a single 4069 with stereo
overdrive and 6db filter.

*Jacob Watters*
JacobWatters.com <http://jacobwatters.com/>



On Wed, Apr 5, 2023 at 10:40 AM S Ridley via Synth-diy <
synth-diy at synth-diy.org> wrote:

> Neil
>
> If it has to be an opamp solution, the LM324 *might* be worth a look.
> It's output is known to produce significant crossover distortion under
> certain conditions - also, it's a single rail device so will still give
> some headroom from a +9v supply.  (It's also easily available and cheap.)
> OTOH crossover distortion will give mainly odd harmonics, and you'd have to
> make sure the output isn't sourcing current at mid rail voltage output -
> the usual fix for the crossover distortion is a resistor to -ve supply.
>
> There's some discussion here:
>
>
> https://electronics.stackexchange.com/questions/341843/adding-a-resistor-to-reduce-crossover-distortion-in-an-lm324-lm358
>
> Might be too subtle for your needs.
>
> Steve
>
>
> On Mon, 3 Apr 2023 at 22:21, Neil Harper via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>> i know this is going to be controversial, and I'm grabbing my popcorn..
>>
>> 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.. :)
>>
>>
>>
>> --
>> /// Neil Harper
>> /// Every Wave is New Until it Breaks
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