madbeanpedals::forum

General => Open Discussion => Topic started by: Wellu on January 03, 2015, 07:49:06 PM

Title: Spst question.
Post by: Wellu on January 03, 2015, 07:49:06 PM
Hello.

Is it possible to make a pedal on/off switch with just a spst switch? Propable problem if you have to wire +9 and guitar input + to the same pin?
Title: Re: Spst question.
Post by: kothoma on January 03, 2015, 08:55:44 PM
No, this won't work.

You could switch the battery with a SPST, but in off-position you wouldn't get a bypassed signal, you'd get no guitar signal at all, and you'd get a loud pop while switching.
That's why nobody switches the battery.

For a bypass function you need at least a DPDT.
Title: Re: Spst question.
Post by: Wellu on January 03, 2015, 09:17:42 PM
Thanks kothoma, i thought that it probably wouldn't work.
Title: Re: Spst question.
Post by: davent on January 04, 2015, 12:57:21 AM
You could use the spst to control a relay or cmos switch that would then do all the signal routing but that's a whole other kettle of fish.
dave
Title: Re: Spst question.
Post by: Wellu on January 04, 2015, 07:01:03 AM
Oh yes! I have also thought about relay controls and been fascinated by it, however for the time being i need to go and get dpdt or 3pdt switch,  because i need to mail my effect out very soon.
Title: Re: Spst question.
Post by: Wellu on January 04, 2015, 10:38:07 AM
Any idea how to include also a led to dpdt switching? I know it would be easy just ti use a 3pdt - switches which i have plenty, but the effect i'm building is so ridicolously small, that any stompswitches won't fit.
Title: Re: Spst question.
Post by: Suzukiscottie on January 04, 2015, 11:40:38 AM

Quote from: Wellu on January 04, 2015, 10:38:07 AM
Any idea how to include also a led to dpdt switching?

Millennium bypass, simple enough, few components. That might fit within your space requirements.


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Title: Re: Spst question.
Post by: Wellu on January 04, 2015, 02:38:45 PM
Ok! That seems interesting! Have to try that.