[sdiy] Tri-core phase reset to +5v or -5v

Rutger Vlek rutgervlek at gmail.com
Sat Mar 9 10:04:36 CET 2019


Thanks David! I love the simplicity of the solution. I assume the actual
reset still happens with a shorting jfet?

Op za 9 mrt. 2019 09:32 schreef David G Dixon <dixon at mail.ubc.ca>:

> The original Intellijel Rubicon had that feature.  There was a panel switch
> for determining whether it reset to +5 or -5 volts.  It's very easy to do.
> You simply follow the integrator with a unity gain inverter with -5V also
> summed in at unity gain to shift the integrator output by +5V.  Send this
> inverted and level shifted output through another inverter then into the
> comparator.  Switching between the outputs of the two inverters selects
> between reset voltages.
>
> > -----Original Message-----
> > From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On
> > Behalf Of Rutger Vlek
> > Sent: Friday, March 08, 2019 11:44 PM
> > To: SYNTH DIY
> > Subject: [sdiy] Tri-core phase reset to +5v or -5v
> >
> > Dear list,
> >
> > I'm working on a triangle and square wave LFO, based around
> > an integrator and window-comparator and would like to reset
> > the phase of the triangle (and derived waveforms) with a
> > trigger event. I've simulated (Spice) to w common technique
> > to short out the integrator capacitor with a JFET, but that
> > of course only resets to 0V, while my triangle is moving
> > between +5V and -5V. Ideally, I'd like to choose which of
> > these voltages to reset to. Any tips on how to implement
> > something like that? It's important for me to maintain stable
> > temperature/tuning of the LFO frequency as I will use it to
> > modulate things at audio rate as well, and prefer to keep a
> > stable timbre as the result.
> >
> > Regards,
> >
> > Rutger
> >
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at synth-diy.org
> > http://synth-diy.org/mailman/listinfo/synth-diy
> >
>
>
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