<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="">If you lose power during a gig, the fact that your unamplified electric guitar can make it through your pedals isn’t going to help you much. So at least for stompboxes, I never saw the benefit of this.<div class="">
<div><br class=""><blockquote type="cite" class=""><div class="">On 31 May 2021, at 23:20, 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=""><br class=""><span class="gmail-im" style="color:rgb(80,0,80)"><br class=""></span><div class="">> In stompbox-world, a lot of people are currently hung up on "true bypass switching" ...</div><div class=""><br class=""></div><div class="">True bypass switching is the only thing that works if you lose power. </div><div class=""><br class=""></div><div class="">You'll find some true bypass switching on some serious pro audio gear too. Neve 33609 comes to mind.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Steve</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" class=""><br class="">
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</tbody></table><a href="x-msg://407/#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1" class=""></a></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 31 May 2021 at 23:04, cheater cheater 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">On Mon, May 31, 2021 at 11:05 PM David G Dixon <<a href="mailto:dixon@mail.ubc.ca" target="_blank" class="">dixon@mail.ubc.ca</a>> wrote:<br class="">
><br class="">
> For audio switching, why would anyone today use anything other than a CMOS<br class="">
> switch?<br class="">
<br class="">
Correct me if I'm wrong, but CMOS doesn't switch 50Vpp. That's the<br class="">
line, unamplified signal, which needs to be switched.<br class="">
<br class="">
> -----Original Message-----<br class="">
> From: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank" class="">synth-diy-bounces@synth-diy.org</a>] On Behalf Of Tom<br class="">
> Wiltshire<br class="">
> Sent: Monday, May 31, 2021 1:48 PM<br class="">
> To: cheater cheater<br class="">
> Cc: synth-diy<br class="">
> Subject: Re: [sdiy] Relays or reed switches for routing?<br class="">
><br class="">
> [CAUTION: Non-UBC Email]<br class="">
><br class="">
> It's not that they cause distortion. If there is a problem with relays, it<br class="">
> would be contact bounce. The acoustic noise they make is not the issue so<br class="">
> much as the electrical noise. They switch fast, so any non-zero signal<br class="">
> causes a click. Obviously some are much worse than others. Some may be good<br class="">
> enough. Silent switching generally means "slow switching" - it's a crossfade<br class="">
> in a few tens of msecs, not a hard jump from one to another.<br class="">
><br class="">
> In stompbox-world, a lot of people are currently hung up on "true bypass<br class="">
> switching" which is (mostly) taken to mean a solid path of metal from input<br class="">
> to output when the effect is out of circuit. This is the current holy grail<br class="">
> because having extra buffers in your signal path is taken to be clearly<br class="">
> wrong (despite highly-thought-of mixing desks having dozens between the<br class="">
> signal coming in and going out). In an attempt to meet this demand whilst<br class="">
> providing silent switching (and also to avoid expensive and failure-prone<br class="">
> 3PDT footswitches), some manufacturers have moved to relays, but these are<br class="">
> often (mostly) accompanied by some type of short-to-ground element to<br class="">
> silence the output while the relay switches. This makes up for the<br class="">
> instantaneous switching and contact bounce of the metal-on-metal relay<br class="">
> switching. The previous pedal generation used FETs to provide this switching<br class="">
> action, and they could be ramped on softly, unlike relays. But for<br class="">
> pedalworld, switching FETs in the signal path and the buffers that go with<br class="">
> them are now often regarded as not the right answer, so other solutions have<br class="">
> been found that hit the current marketing buzzword.<br class="">
><br class="">
> HTH,<br class="">
> Tom<br class="">
><br class="">
> ==================<br class="">
> Electric Druid<br class="">
> Synth & Stompbox DIY<br class="">
> ==================<br class="">
><br class="">
><br class="">
><br class="">
> > On 31 May 2021, at 13:57, cheater cheater via Synth-diy<br class="">
> <<a href="mailto:synth-diy@synth-diy.org" target="_blank" class="">synth-diy@synth-diy.org</a>> wrote:<br class="">
> ><br class="">
> > Why would relays introduce distortion? Aren't they just a conductor<br class="">
> > that gets mechanically moved back and forth. What's the nonlinearity?<br class="">
> ><br class="">
> > On Mon, May 31, 2021 at 2:10 PM Gordonjcp <<a href="mailto:gordonjcp@gjcp.net" target="_blank" class="">gordonjcp@gjcp.net</a>> wrote:<br class="">
> >><br class="">
> >> On Sun, May 30, 2021 at 11:22:38AM +0200, cheater cheater wrote:<br class="">
> >>> Why can I not use relays to switch audio? What's wrong with relays?<br class="">
> >>><br class="">
> >>> BTW, I was thinking of acoustically dampening relays. EG use sound<br class="">
> >>> proofing foam.<br class="">
> >><br class="">
> >> They're electrically noisy as well as mechanically noisy. They're<br class="">
> unreliable when you use them for switching tiny currents. They introduce a<br class="">
> lot of distortion.<br class="">
> >><br class="">
> >> Literally nothing sane uses relays in the audio path.<br class="">
> >><br class="">
> >> --<br class="">
> >> Gordonjcp<br class="">
> >><br class="">
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