[sdiy] Mixing PWM audio from 2 different devices. Ouch!

Paul Perry pfperry at melbpc.org.au
Fri Jul 21 01:51:06 CEST 2023


If it is just a stable single frequency, it might be worth trying a simple
active
notch filter. Cheap and easy, one op amp and a couple of C and R.

paul perry melbourne australia

On Fri, Jul 21, 2023 at 5:32 AM <rburnett at richieburnett.co.uk> wrote:

> It's worth trying a couple of 1st-order passive RC filters.  They'll
> reduce the high frequency components to some extent, and it's probably
> the highest frequencies that are causing the most trouble.
>
> On 2023-07-20 19:21, Tom Wiltshire wrote:
> > Two or three op-amps for a couple of filters and a mixer *is* "cheap
> > and skimpy"!! We're talking about $1 of parts and 2 sq inches of perf
> > board!
> >
> > T
> >
> >> On 20 Jul 2023, at 19:05, Benjamin Tremblay via Synth-diy
> >> <synth-diy at synth-diy.org> wrote:
> >>
> >> Thanks all!
> >>
> >> I have to decide if it’s worth fixing. Trying to be cheap and
> >> skimpy on this project.
> >> I’m going to guess I could have similar problems mixing the
> >> outputs of gadgets like the PT2399.
> >>
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