Momentary AND latching switch in the same pedal??

[alange5]

I'm building a Dunlop Q-zone for a friend.  He requested a momentary foot switch in addition to the standard latching switch, to be able to easily tap the effect on and off.  How would I go about wiring it?  Assuming I use a 3PDT momentary switch, would I simply duplicate the wiring of the 3PDT latching switch, making all of the same connections to the board?

[vigilante397]

Definitely not. If you're going to be using a momentary switch instead of the latching switch you're going to need some kind of relay for the switching.

[Mark Hammer]

One of the reasons why I like the CMOS switches that Craig Anderton presented in his books is that they use an SPST switch.  And that lets me use either a latching or a non-latching switch to actuate them.

Moreover, as long as the latching switch is open, I can use a paralleled momentary switch as a kind of "punch-in".  If you try to do that with multi-contact stompswitches, I think you'll find it's pretty much impossible.

On the other hand, looking at the schematic, I see it is not normally true-bypassed, so you could use a momentary DPDT as the primary switch if push came to shove.  Just note that they are not soft-touch and have a discernible click.  It would be wired up as bypassed for the default, and engage when stepped on; reverting back to bypass when you lift your foot.

[Calambres]

Alange, I did that in one of my projects, the EA-Tremolo (in spanish...)

This is the schematic for both switches:



Left is latching and right is momentary. The blue lines represent the contactors.
The momentary DPDT is represented in its "non clicked" status. The Latching DPDT is wired to use RG's Millenium-2 Bypass LED control.
One shortcoming with this scheme based in DPDTs is that it does not permit to switch on the LED with the momentary DPDT but, on the other hand, when you stomp on the momentary you *know* you're doing it and you don't need a LED to warn you, right?  :-)   otherwise, use 3PDTs.

[alange5]

Hmmmm looks like that would be biting off more than I could chew.  What about two switches - one latching and one momentary - selectable via a 6PDT toggle switch?  Both switches wouldn't be active at the same time, but at least you'd have the option of doing either/or....

OR

I found this:




That looks like it could work too....

[vigilante397]

I found this:

That looks like it could work too....

Oh. And now I realize what it is that you wanted. In that case yes, this should work.

[Transmogrifox]

I found this:




That looks like it could work too....

Yes.  The above is what you want.

As an aside, with a relay as the switch, you could probably combine both functions into a single momentary spst switch.  If you tap it, it toggles, acting like a latching switch.  If you hold it for N milliseconds, it acts like a momentary.

[RickL]

One more option, in this thread: http://www.diystompboxes.com/smfforum/index.php?topic=48813.msg362131#msg362131
No status indicator, but it works both ways - bypass with momentary engage or engage with momentary bypass.

[kaycee]

Alange, I did that in one of my projects, the EA-Tremolo (in spanish...)

This is the schematic for both switches:



Left is latching and right is momentary.

Clever, thanks for sharing!