Author Topic: Momentary and Latching Bypass Operation  (Read 131 times)

labyrinthaudio

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Momentary and Latching Bypass Operation
« on: July 04, 2018, 03:48:43 PM »
I'm attempting to put one footswitch for momentary and another footswitch for latching bypass in one of my prototypes (green ringer). Tried this arrangement as per the diagram but when bypassed, it doesn't pass signal. I'm assuming the signal gets dumped to ground. Anyone else try this?

Would a 1776 Effects Finish Line Relay Bypass PCB work? Both switches would be SPST but one normally open and the other normally closed, wired to the same SW1 Terminals?

I've searched for this topic but haven't come up with any relevant info.
Thanks!!!

mjg

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Re: Momentary and Latching Bypass Operation
« Reply #1 on: July 04, 2018, 04:28:28 PM »
The diagram you have looks like it should work.  When the 3pdt is bypassed, the signal should go up to the 2pdt, across the top of it via that short link, then back down to the 3pdt and out to the amp.  When you press the momentary, the signal should go back down to the fx, then back up to the momentary, then from there back to the 3pdt and out.  It's more complex than using just a single switch, but it should work.

The only connection to ground should be for the LED. So the signal shouldn't go to ground anywhere in this setup. 

I'd probably start by checking continuity with a multimeter, follow the wires and see where you still get a connection to the input.  Or use an audio probe if you've got one of those.

Maybe you have the normally closed/open of the momentary wrong way? 

labyrinthaudio

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Re: Momentary and Latching Bypass Operation
« Reply #2 on: July 04, 2018, 05:46:28 PM »
Thanks mjg!!! Yes, good call on the switch orientation. I'll check this out tonight and report back.