<div dir="ltr"><div>Just a note to say thanks to everyone contributing to this conversation. I've applied lots of what I learned here to my design,
and I've got the PWM/pitch interaction down to what I think is an acceptable minimum. Anyways, it's nothing special, but I've started a <a href="https://www.muffwiggler.com/forum/viewtopic.php?f=17&t=225670">build thread over at muffs</a>, for anyone who needs yet another low cost 3340 vco. I need several, so thought I may as well go public in case anyone else does, too. I'll be using JLCPCB assembly for all the resistors and caps, and the rest will be through hole at home. I have lots of as3340s, so can include with the PCB if anyone needs. 3340 is running on +10/-5, so the circuit should be at home in 12v or 15v setups. I'm in Yukon, Canada.</div><div>Thanks,</div><div>Colin<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jan 3, 2020 at 12:39 PM David G Dixon <<a href="mailto:dixon@mail.ubc.ca">dixon@mail.ubc.ca</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div lang="EN-US">
<div class="gmail-m_-7709889972631334277Section1">
<p class="MsoNormal"><font size="2" face="Arial" color="navy"><span style="font-size:10pt;font-family:Arial;color:navy">The Intellijel Rubicon (and Rubicon-2)
gives the option of generating pulse waves from Triangle, Saw, or Double-Saw
(twice the frequency). It’s not a whole synth, just a TZFM VCO.<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial" color="navy"><span style="font-size:10pt;font-family:Arial;color:navy"><u></u> <u></u></span></font></p>
<div>
<div class="MsoNormal" style="text-align:center" align="center"><font size="3" face="Times New Roman"><span style="font-size:12pt">
<hr width="100%" size="2" align="center">
</span></font></div>
<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10pt;font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10pt;font-family:Tahoma"> Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>Mattias Rickardsson<br>
<b><span style="font-weight:bold">Sent:</span></b> Friday, January 03, 2020
6:57 AM<br>
<b><span style="font-weight:bold">To:</span></b> Richie Burnett<br>
<b><span style="font-weight:bold">Cc:</span></b> Brian Willoughby; Synth DIY<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [sdiy] as3340
PW/tuning issue</span></font><u></u><u></u></p>
</div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
<div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">On Fri, 3 Jan 2020 at 10:31, Richie Burnett <<a href="mailto:rburnett@richieburnett.co.uk" target="_blank">rburnett@richieburnett.co.uk</a>>
wrote:<u></u><u></u></span></font></p>
</div>
<div>
<blockquote style="border-color:currentcolor currentcolor currentcolor rgb(204,204,204);border-style:none none none solid;border-width:medium medium medium 1pt;padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><br>
... The faster the rate of change of the LFO waveform the greater the pitch
modulation. Try whacking LFO speed up and listen to the seasick pitch warble on
most synths with pwm!<br>
<br>
However, pwm generated from a triangle waveform source results in both edges of
the pulse waveform being modulated equally and in opposite directions.
Therefore the centroid of the pulses doesn't move and there is no resulting
pitch modulation. That's one of the advantages of using a triangle wave instead
of sawtooth to generate PWM waveforms. <u></u><u></u></span></font></p>
</blockquote>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">I'd say this chorus-y pitch warble is often a desired and/or useful
feature of the PWM setting for many people.<u></u><u></u></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Is any commercial synth known for using the triangle wave to create the
pulse wave without warble?<u></u><u></u></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
</div>
<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">/mr<u></u><u></u></span></font></p>
</div>
</div>
</div>
</div>
</div>
_______________________________________________<br>
Synth-diy mailing list<br>
<a href="mailto:Synth-diy@synth-diy.org" target="_blank">Synth-diy@synth-diy.org</a><br>
<a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br>
</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank">https://www.instagram.com/colinmuirdorward/</a></div><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank">-<br></a></div><div><a href="https://www.instagram.com/ssdp_synthesis/" target="_blank">https://www.instagram.com/ssdp_synthesis/</a></div></div></div></div></div></div></div>