<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Kinda off the subject, but I find it really hard to believe the way the taps are coming off of those BBDs. The long looks ok, but….<div class=""><br class=""></div><div class="">Mark</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Feb 9, 2023, at 8:13 PM, S Ridley via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">The Serge WAD (Wilson Analog Delay) might be worth a look - high frequency VCO driving two SAD1024s.<div class=""><br class=""></div><div class=""><a href="https://www.elby-designs.com/webtek/cgs/serge/cgs208/cgs208_schematic.gif" class="">https://www.elby-designs.com/webtek/cgs/serge/cgs208/cgs208_schematic.gif</a><br class=""></div><div class=""><br class=""></div><div class="">Spec says delays down to 0.5mS, dunno how well it tracks. HF VCO is expo converter driving a CMOS oscillator.</div><div class=""><br class=""></div><div class="">Steve<br class=""><div class=""><br class=""></div><div class=""> </div></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 7 Feb 2023 at 18:21, Rutger Vlek via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" class="">synth-diy@synth-diy.org</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class="">Dear list,<div class=""><br class=""></div><div class="">For a while I've been working on a guitar pedal board for personal use. I'm about to build the second revision of a solid state pre-amp, and was thinking about possible modulation effects too. I would love a nice (stereo) BBD flanger/chorus, but felt a bit fed-up with all the 'classic' designs, particularly the traditional clocking scheme, usually with a limited range, lack of current drive (to overcome capacitance of the BBD clock input) and strictly linear modulation (calling for a hyper-triangle modulation source).</div><div class=""><br class=""></div><div class="">Having some experience with designing saw- and tri-core VCO's around the 2164, I was wondering how easy it would be to push the design of a typical tri-core VCO with an 2164-based expo converter into higher frequencies (let's say up to 500kHz) and use it to clock a BBD? Has anyone tried? Or are there fundamental reasons why such frequencies are not possible? I've never (intentionally) worked with circuits outside of the audio bandwidth...</div><div class=""><br class=""></div><div class="">Rutger</div></div>
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