[sdiy] Outputs and Impedances
maohelin at gmail.com
Fri Oct 26 11:41:11 CEST 2018
Also sometimes 1k resistors in front of TL07/8xs are used to prevent
pe 26. lokak. 2018 klo 7.02 Tony K <weplar at gmail.com> kirjoitti:
> If you look on monosynth schematics manufacturers often used 1 K resistors
> to feed subsequent stages. as load resistors. Especially some sort of
> signal mixing was desired ( transistor circuits without op-amps did used
> this cost cutting measure see early Roland drum machines for example)
> > On Oct 25, 2018, at 11:00 PM, mskala at ansuz.sooke.bc.ca wrote:
> >> On Thu, 25 Oct 2018, Youssef Menebhi wrote:
> >> Sorry, but I just need to clarify the exceptions:
> >> The idea is that the "inputs" that are being fed by the output of the
> >> single op-amp will serve ultimately as outputs from the device. So,
> >> buffers are needed?
> > If there are voltage dividers between the op amp output and the outside
> > world, that's probably going to be enough to prevent the outside loads
> > from affecting each other through the op amp output. What I was
> > imagining as a problem would be if you had something like the op amp
> > output connected *directly* to an output jack, and also to internal
> > stuff - in that case, someone plugs a short into the output jack and then
> > no signal gets to the other internal destinations either.
> > But what are you actually building? Some sort of interface? Are you
> > your voltage dividers are going to present the right impedance to the
> > outside world? That seems to me more likely to be an issue than the
> > internal connection between the op amp and the three voltage dividers,
> > which would normally be just a wire and not require any special design
> > of its own.
> > --
> > Matthew Skala
> > mskala at ansuz.sooke.bc.ca People before tribes.
> > http://ansuz.sooke.bc.ca/
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at synth-diy.org
> > http://synth-diy.org/mailman/listinfo/synth-diy
> Synth-diy mailing list
> Synth-diy at synth-diy.org
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Synth-diy