I'd like a momentary switch (and true bypass) for my EH Small Stone phaser

[ultralinear]

Does the method shown here apply to the Small Stone?

http://www.rodrigoconstanzo.com/whammy-mod/

Should I be able to work it out from the input and output? Or will it click or do something else undesirable?

Many thanks.

[R.G.]

(Momentary switch) + (true bypass) = (relay) + (latching circuit)

[ultralinear]

So this method would work ok?

[ultralinear]

I really am pretty much clueless at present...

I don't know if the pedal is permanently on (whilst the lead is in the input) and the switch usually simply connects the wet audio to the output rather than the buffered dry signal. I don't know how the buffer works... I don't know if true bypass is liable to making a 'click' noise when you operate the switch.

I really need some resources to read.

Perhaps I should get some cheap pedals and tinker with them; seeing what happens...

[R.G.]

I think the Whammy has an internal latching circuit in the logic/electronics which remembers whether it's supposed to be bypassed or not. For instance, it's responsible for turning on the indicator of whether the effect is engaged or not. Certainly it does if the switch is momentary.  The Whammy has a lot of logic circuits in it.

The Small Stone - at least older analog ones, don't know about any reissues/recent updates, etc., are analog, and as such don't have the internal logic circuits to remember bypassed/not.  So I'd guess that no, it will not work that way. That is, there (probably) isn't any simple little mod to a Small Stone to do that. No, in general, I would not expect you to work it out from the input and outputs.

But don't despair. You can make your own small clot of logic to flip a relay on/off based on a momentary switch. It's more advanced than just cutting traces and running wires. I don't know if that's an issue for you.

A relay based true bypass can be made to be fairly silent. Hard switch contacts (relays, stompswitches, etc.) can never be as silent as an electronic circuit that fades sound in and out over a few milliseconds. But it can be made OK.

;; you simulposted with this.

That helps me gauge your background. You need to read "The Technology of Bypasses" at geofex.com. Upper left hand corner, "Technology of..." button.

There's a bunch of background info on true (and not) bypassing at geofex, including using electronic circuits and relays to do this.

I'm doing a poor job of explaining this, I realize. It's largely because I don't know your degree of electronics knowledge and/or experience. It's not intentional.

[ultralinear]

Thank you R.G.

That is actually very helpful. I have basic knowledge of almost all individual components. I have very little knowledge of how audio circuits work. I know very little about ICs. I can use a soldering iron. I have a thirst for knowledge... That is where I'm currently at!