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size=2 face=Arial>Yes</FONT></SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><B>From:</B> Rutger Vlek
[mailto:rutgervlek@gmail.com] <BR><B>Sent:</B> Saturday, March 09, 2019 1:05
AM<BR><B>To:</B> David G Dixon<BR><B>Cc:</B> SDIY List<BR><B>Subject:</B> Re:
[sdiy] Tri-core phase reset to +5v or -5v<BR></FONT><BR></DIV>
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<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>
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<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>
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class=gmail_quote>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" rel=noreferrer
target=_blank>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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