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Instrument single input channel selector pedal switch
Instrument single input channel selector pedal switch
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Old 5th January 2019, 01:15 AM   #11
PRR is offline PRR  United States
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> If you've half a brain you'll be able to do this with a handful of relays.

Is that a dig?

My half-brain leads to 5 relays, 4 large e-caps, and tangled wiring.

Search "Ladder Logic" today and you mostly get software emulations of true relay logic.
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Old 5th January 2019, 01:22 AM   #12
mandu is offline mandu  Singapore
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You can use four of MAX16054 switching IC to do this function. Use 4 momentary push buttons for each of the ICs input. Wire 3 diodes from each switch output to 'clear' of other three ICs.
Switch bounce is taken care of the IC.
Each IC has high and low outputs at 5 volts logic level which you can use to drive a FET switch or relay as necessary
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mandu
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File Type: pdf MAX16054.pdf (113.1 KB, 7 views)
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Old 6th January 2019, 11:45 AM   #13
thoglette is offline thoglette  Australia
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Quote:
Originally Posted by PRR View Post
> If you've half a brain you'll be able to do this with a handful of relays.

Is that a dig?
No, not at all.
That's just me being too lazy to work it out; capture the results and post them here

Quote:
Originally Posted by PRR View Post
My half-brain leads to 5 relays, 4 large e-caps, and tangled wiring.
Probably about right; depending on which relays you have handy (we used to have ones with lots of poles for AND and OR). You can cheat with a handful of diodes.
Just as lazy today

Quote:
Originally Posted by PRR View Post
Search "Ladder Logic" today and you mostly get software emulations of true relay logic.
Yup, but the ideas are the same. Ish.
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Old 6th January 2019, 01:08 PM   #14
mandu is offline mandu  Singapore
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if you go with relay, you will need 4 relays + 4 FET or 8 relays.
See sketch attached.
regards,
Mandu
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File Type: pdf Relay Logic.pdf (24.2 KB, 7 views)
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Old 7th January 2019, 02:24 AM   #15
PRR is offline PRR  United States
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> you will need 4 relays +......

Thank you!

Indeed elegant as ladder-logic drawing.

Requires (practically) 4PDT relays, and a LOT of contact busing.

On the audio side, I would use a different form of switch (shunt loads the sum point; series would not) but that is a minor detail.

If a 5PDT relay were commonly sold, seems the audio end would be done. And of course a xP2T relay can be paralleled-up from 2P2T forms (parallel the coils and the contacts follow).

LED indicator (a must in the distraction of performance) is trivial.

I'm not sure anyone unfamiliar with relay logic forms and conventions will quickly grok that wiring.
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