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DIY Stompboxes => Building your own stompbox => Topic started by: rangermaster on May 26, 2021, 06:45:22 PM

Title: Spdt switch
Post by: rangermaster on May 26, 2021, 06:45:22 PM
Hi again.

Question. I have a couple of spdt switches(3 pin)  that are not used. Is it possible to put these in diy effect pedals? Normally you'll see them in dunlop wahs but i don't know how to wire these in a standard pedal. Anyone knows how to do this ?

Tnx
(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQQi8cMiwG0TS0PzvR1OhJ_OvIHiqM3Ii476A&usqp=CAU)
Title: Re: Spdt switch
Post by: stallik on May 26, 2021, 07:14:43 PM
The limitation of a single pole switch in a pedal is that while you can switch the guitar signal between the circuit board and the output jack, the board output will have to be permanently connected to the same output jack which will mess with the signal when you're in bypass.

A second pole is needed to switch the board output at the same time as the input is switched and a third pole is mighty handy for the LED.

Of course you could always use the switch to power relays which in turn do all the clever switching but by the time you've bought the relay and a board to mount it, a standard 3pdt switch looks much easier
Title: Re: Spdt switch
Post by: PRR on May 26, 2021, 11:46:50 PM
Normally with 1 pole you must switch the Output. Most active outputs will completely swamp a guitar's output. An active input can bridge a guitar without "much" tone-suck.
Title: Re: Spdt switch
Post by: rangermaster on May 27, 2021, 03:30:39 AM
Ok thanks for the replies! I'll leave them where they are  :icon_lol:

I'll stick with 3pdt.
Title: Re: Spdt switch
Post by: GibsonGM on May 27, 2021, 05:12:34 AM
Keep them handy, you CAN use them for other 'functions' inside effects pedals, though!  :)  Perhaps switching between different clipping diodes and so on...
Title: Re: Spdt switch
Post by: iainpunk on May 27, 2021, 02:59:26 PM
i use those for ''voice 1//2'' options.
like a fuzz with either harsher clipping diodes or a mid scoop, and such a switch selects which ''channel'' is on.
or have it switch a bright or fat cap, or a gain boost.

cheers
Title: Re: Spdt switch
Post by: rangermaster on May 27, 2021, 04:06:16 PM
Yeah i will keep them for sure.

As we say in holland.. who keeps some, got some  :icon_lol: :icon_lol:
Title: Re: Spdt switch
Post by: iainpunk on May 27, 2021, 05:26:46 PM
"wie wat bewaart, heeft wat"
its a great proverb, advocating for hoarding

cheers
Title: Re: Spdt switch
Post by: duck_arse on May 28, 2021, 10:59:13 AM
Scotty from Marketing tells us "have a go to get a go".
Title: Re: Spdt switch
Post by: moid on May 28, 2021, 08:23:36 PM
The British expression for this situation is to "save one for a rainy day" which means they'll be useful at some point in the future... quite how far into the future is anyone's guess, so never throw any components away is the obvious decision to make!