<div dir="ltr"><div>I have an API channel strip - lots of relays. <br></div><div>All my Eventide stompbox pedals use relays for bypass - direct signal flows even with power off</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, May 31, 2021 at 3:21 PM S Ridley via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</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 dir="ltr"><br><span style="color:rgb(80,0,80)"><br></span><div>> In stompbox-world, a lot of people are currently hung up on "true bypass switching" ...</div><div><br></div><div>True bypass switching is the only thing that works if you lose power. </div><div><br></div><div>You'll find some true bypass switching on some serious pro audio gear too. Neve 33609 comes to mind.</div><div><br></div><div><br></div><div><br></div><div><br></div><div>Steve</div><div><br></div><div><br></div><div><br></div><div><br></div></div><div id="gmail-m_-2735214084122655027DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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</tbody></table><a href="#m_-2735214084122655027_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><br><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" target="_blank">synth-diy@synth-diy.org</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">On Mon, May 31, 2021 at 11:05 PM David G Dixon <<a href="mailto:dixon@mail.ubc.ca" target="_blank">dixon@mail.ubc.ca</a>> wrote:<br>
><br>
> For audio switching, why would anyone today use anything other than a CMOS<br>
> switch?<br>
<br>
Correct me if I'm wrong, but CMOS doesn't switch 50Vpp. That's the<br>
line, unamplified signal, which needs to be switched.<br>
<br>
> -----Original Message-----<br>
> From: Synth-diy [mailto:<a href="mailto:synth-diy-bounces@synth-diy.org" target="_blank">synth-diy-bounces@synth-diy.org</a>] On Behalf Of Tom<br>
> Wiltshire<br>
> Sent: Monday, May 31, 2021 1:48 PM<br>
> To: cheater cheater<br>
> Cc: synth-diy<br>
> Subject: Re: [sdiy] Relays or reed switches for routing?<br>
><br>
> [CAUTION: Non-UBC Email]<br>
><br>
> It's not that they cause distortion. If there is a problem with relays, it<br>
> would be contact bounce. The acoustic noise they make is not the issue so<br>
> much as the electrical noise. They switch fast, so any non-zero signal<br>
> causes a click. Obviously some are much worse than others. Some may be good<br>
> enough. Silent switching generally means "slow switching" - it's a crossfade<br>
> in a few tens of msecs, not a hard jump from one to another.<br>
><br>
> In stompbox-world, a lot of people are currently hung up on "true bypass<br>
> switching" which is (mostly) taken to mean a solid path of metal from input<br>
> to output when the effect is out of circuit. This is the current holy grail<br>
> because having extra buffers in your signal path is taken to be clearly<br>
> wrong (despite highly-thought-of mixing desks having dozens between the<br>
> signal coming in and going out). In an attempt to meet this demand whilst<br>
> providing silent switching (and also to avoid expensive and failure-prone<br>
> 3PDT footswitches), some manufacturers have moved to relays, but these are<br>
> often (mostly) accompanied by some type of short-to-ground element to<br>
> silence the output while the relay switches. This makes up for the<br>
> instantaneous switching and contact bounce of the metal-on-metal relay<br>
> switching. The previous pedal generation used FETs to provide this switching<br>
> action, and they could be ramped on softly, unlike relays. But for<br>
> pedalworld, switching FETs in the signal path and the buffers that go with<br>
> them are now often regarded as not the right answer, so other solutions have<br>
> been found that hit the current marketing buzzword.<br>
><br>
> HTH,<br>
> Tom<br>
><br>
> ==================<br>
> Electric Druid<br>
> Synth & Stompbox DIY<br>
> ==================<br>
><br>
><br>
><br>
> > On 31 May 2021, at 13:57, cheater cheater via Synth-diy<br>
> <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br>
> ><br>
> > Why would relays introduce distortion? Aren't they just a conductor<br>
> > that gets mechanically moved back and forth. What's the nonlinearity?<br>
> ><br>
> > On Mon, May 31, 2021 at 2:10 PM Gordonjcp <<a href="mailto:gordonjcp@gjcp.net" target="_blank">gordonjcp@gjcp.net</a>> wrote:<br>
> >><br>
> >> On Sun, May 30, 2021 at 11:22:38AM +0200, cheater cheater wrote:<br>
> >>> Why can I not use relays to switch audio? What's wrong with relays?<br>
> >>><br>
> >>> BTW, I was thinking of acoustically dampening relays. EG use sound<br>
> >>> proofing foam.<br>
> >><br>
> >> They're electrically noisy as well as mechanically noisy. They're<br>
> unreliable when you use them for switching tiny currents. They introduce a<br>
> lot of distortion.<br>
> >><br>
> >> Literally nothing sane uses relays in the audio path.<br>
> >><br>
> >> --<br>
> >> Gordonjcp<br>
> >><br>
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