<div dir="auto">Thanks David! I love the simplicity of the solution. I assume the actual reset still happens with a shorting jfet? </div><br><div class="gmail_quote"><div dir="ltr">Op za 9 mrt. 2019 09:32 schreef David G Dixon <<a href="mailto:dixon@mail.ubc.ca">dixon@mail.ubc.ca</a>>:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The original Intellijel Rubicon had that feature. There was a panel switch<br>
for determining whether it reset to +5 or -5 volts. It's very easy to do.<br>
You simply follow the integrator with a unity gain inverter with -5V also<br>
summed in at unity gain to shift the integrator output by +5V. Send this<br>
inverted and level shifted output through another inverter then into the<br>
comparator. Switching between the outputs of the two inverters selects<br>
between reset voltages.<br>
<br>
> -----Original Message-----<br>
> From: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank" rel="noreferrer">synth-diy-bounces@synth-diy.org</a>] On <br>
> Behalf Of Rutger Vlek<br>
> Sent: Friday, March 08, 2019 11:44 PM<br>
> To: SYNTH DIY<br>
> Subject: [sdiy] Tri-core phase reset to +5v or -5v<br>
> <br>
> Dear list,<br>
> <br>
> I'm working on a triangle and square wave LFO, based around <br>
> an integrator and window-comparator and would like to reset <br>
> the phase of the triangle (and derived waveforms) with a <br>
> trigger event. I've simulated (Spice) to w common technique <br>
> to short out the integrator capacitor with a JFET, but that <br>
> of course only resets to 0V, while my triangle is moving <br>
> between +5V and -5V. Ideally, I'd like to choose which of <br>
> these voltages to reset to. Any tips on how to implement <br>
> something like that? It's important for me to maintain stable <br>
> temperature/tuning of the LFO frequency as I will use it to <br>
> modulate things at audio rate as well, and prefer to keep a <br>
> stable timbre as the result.<br>
> <br>
> Regards,<br>
> <br>
> Rutger<br>
> <br>
> <br>
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> <br>
<br>
</blockquote></div>