"stereo" relay bypass switching

[tmsmtz]

Hi!

Tried asking about this at the pedalpcb forum, but I didnt seem to find the answer.
I want to build two identical effect circuits for dual/stereo operation in a single chassis and use relay bypass boards for silent switching using one footswitch.
I was considering using these boards from parasit: https://www.parasitstudio.se/store/p58/Relay_Bypass_PCB.html

So first I thought I would just need a momentary DPDT footswitch, the problem is I cant seem to find silent switches of this type. "No-click" SPST switches seems available though.

Then I came across this (more expensive) board: https://griffineffects.com/mods-kits/griffin-effects/switching/silent-step
Under "download" they have a doc for "other uses" and on page 3 it shows an illustration which seems to suit my purposes.

Would this work with the parasit relay bypass boards as well? I tried contacting parasit directly, but no response so far.

Lastly, am I correct in assuming I should use a normally open momentary switch?

[FiveseveN]

You can use the same control signal to switch both (and many more) bypass circuits, you don't need separate poles. The build doc doesn't include a schematic so I can't give precise details, but you should only install one flip-flop and control both relay drivers with it. Maybe @Freppo will respond.

I was considering using these boards

Why not make your own for your exact requirements? Handful of parts, nothing fancy, perfect for perf or stripboard and sounds like a learning opportunity.

PS: I almost missed an opportunity to rant about obsession with true bypass. The scarcity of compact 4PDT relays should make the alternatives that much more attractive.

[tmsmtz]

Thanks man!
Yes, it would definetly be a learning experience, but it seems a little ambitious at my current level. I have built a few pedals, but I am mostly just following the build docs, without the deep understanding of electronics everyone else here seems to have. Feels a little like cheating, -sorry:)
Freppo, is that the parasit guy perhaps?

[FiveseveN]

Freppo, is that the parasit guy perhaps?

Yes, he is a member.

without the deep understanding of electronics

But this isn't deep understanding, just switches and transistors (fancy switches). Or forget the transistors, you can do it with a latching (single pole) footswitch and two relays. Add a flyback diode to be safe. Take the time to understand why it's needed and you're well on your way to grasping inductors. Take advantage of the free knowledge on the Internet.

[tmsmtz]

ok, deeper than me then:) -but I get your point and will give it a go. Thanks again!

[MrStab]

If you can manage replacing C1 on one of those switching boards, perhaps for a cap half or double the original size, you might save yourself some pop and power rail disturbance by having two relays flip at the exact same moment.

Edit: oh sugar, that's the PSU bypass cap. Oh well, guess the delay is all coded. It's been a long day. Nevermind!