[sdiy] Relays or reed switches for routing?

S Ridley spridley1 at gmail.com
Tue Jun 1 00:20:30 CEST 2021


> In stompbox-world, a lot of people are currently hung up on "true bypass
switching" ...

True bypass switching is the only thing that works if you lose power.

You'll find some true bypass switching on some serious pro audio gear too.
Neve 33609 comes to mind.




Steve





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On Mon, 31 May 2021 at 23:04, cheater cheater via Synth-diy <
synth-diy at synth-diy.org> wrote:

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