Momentary and Latching, Switches

[rove]

I have a couple of music man amps that use a footswitch to turn on and off the built in phaser in the amp.  What I am wanting to do  is wire a latching switch and a momentary switch such that the latching switch turns the phase on and off and the momentary switch simply reverses the current state.  Any tips on how to wire this up?
thanks.
Paul

[Processaurus]

Most amps with simple footswitch arrangements use a spst stompswitch to connect the tip of the footswitch cord to the sleeve (ground).

To do what you want, you'll need a dpdt latching switch and a spdt momentary switch.  Small bear has good robust ones.  The dpdt is used to reverse which side of the momentary switch (the normally open or the normally closed) gets connected to the tip, and the momentary's common is connected to ground.

just imagine the switches in different states and follow the path through.

[JimRayden]

I have a couple of music man amps that use a footswitch to turn on and off the built in phaser in the amp.  What I am wanting to do  is wire a latching switch and a momentary switch such that the latching switch turns the phase on and off and the momentary switch simply reverses the current state.  Any tips on how to wire this up?
thanks.
Paul

Wouldn't turning an effect on be reversing it's current state (off->on) and vice versa?

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Jimbo

[rove]

Yes, turning it on reverses the current state, I just mean to say that I would like for the momentary switch to still function when the latching switch is active.  This particular switch requires the signal to be broken in order for the effect to engage, and I have that working with a NC side of a NC/NO switch I got from small bear.  Trying to figure out how to wire the dpdt switch up, though.  Still getting my head around switches and I thought I had it, but not quite.  Could someone perhaps show me a diagram?
thanks!

[JimRayden]

Yes, turning it on reverses the current state, I just mean to say that I would like for the momentary switch to still function when the latching switch is active.  This particular switch requires the signal to be broken in order for the effect to engage, and I have that working with a NC side of a NC/NO switch I got from small bear.  Trying to figure out how to wire the dpdt switch up, though.  Still getting my head around switches and I thought I had it, but not quite.  Could someone perhaps show me a diagram?
thanks!

Ahh, now I get it.

---------
Jimbo

[RickL]

I posted instructions on how to wire up a 3p2t latching and a dpdt momentary to get true bypass with the momentary switch changing states. I think what you want would work with a dpdt latching and spdt momentary by using part of the instructions.

I don't remember what subject I posted it under but try a search using just my name. I don't post all that often so you should be able to find it fairly easily. It may get you started in the right direction.

Rick

[JimRayden]

I did some sketching and it seems like a simple XOR gate. Now it's all about finding a logic gate chip and wiring it up to a JFET switcher. Some tinkering but should be a pretty simple schemo in the end.

---------
Jimbo

[rove]

Any ideas on a passive design?  No big deal as I was planning to throw in an LED anyways, but I keep thinking there should be a way to do this with a 3pdt and a momentary... the momentary switch I have has a  NC side and a NO side...
thanks for the tips!
Paul

[Pushtone]

I , I find!


RickL's post. Just what you were looking for I believe and something I read, got excited about, and forgot.


Not just a solution fro Rove, this is a great bypass idea for tremolo and phase effects.

Brilliant.

http://www.diystompboxes.com/smfforum/index.php?topic=48813.0

Thanks RickL for bringing this up again. I think I will do that diagram you suggest.

[rove]

thanks, I tried a search, but for some reason hadn't turned that up.  Just gotta get those poles straight.  I'll let y'all know how it turns out! If anyone wants to draw out a quick sketch of how to do this with just a footswitch ie no audio signal, trying to figure out what I can omit from the linked "drawing"
thanks again.
Paul

[Pushtone]

http://www.diystompboxes.com/smfforum/index.php?topic=48813.0

Thanks RickL for bringing this up again. I think I will do that diagram you suggest.

Diagramed from the description in this thread
http://www.diystompboxes.com/smfforum/index.php?topic=48813.0
by RickL.

[rove]

thank you thank you thank you!
love this forum.
best,
Paul

[Pushtone]

gee rove, I've been staring at this all morning and I can not figure out how to adapt it to your amps footswitch? ??
Need a break I guess.

I had one of those MusicMan amps with the phaser. It was great. I regret selling it.
I can totaly see your application for the footswitch.
As I remember my MM amp's phaser could go into "stuck wah" mode by pulling the speed pot out. A switched pot.

[rove]

I actually have two of those amps with the phaser, and though I often forget about it they have that pull out for stuck phase feature.  Great sounding phasers.  Glad it isn't just me, just when I think I am getting my head around switches I come up with something like this that gives me a headache.  I was going to give it a fresh look with the drawing in hand tomorrow.
thanks again.

[RickL]

Try this - you'll need a spdt momentary and a dpdt latching.

a b c

1 2 3
4 5 6

b - to ground (sleeve of jack)
a - to 2
c - to 5
1 to 6
4 to 3 and to tip of jack (or centre wire of footswitch cable)

[JimRayden]

gee rove, I've been staring at this all morning and I can not figure out how to adapt it to your amps footswitch? ??
Need a break I guess.

Ditch the 'out' jack with the wires attached to it. Remove circuit board and connect the PCB's 'IN' to input's sleeve.

Then start removing wires and switch poles that are unnecessary for this connection. (and the battery plus its relevant wires if so desired.)

---------
Jimbo

[RickL]

I've been rethinking this. There is an easier way. spdt momentary (a b c) and spdt latching (1 2 3)

b - to ground (sleeve of jack)
a - to 1
c - to 3
2 - to centre wire (tip of jack)

[rove]

I've been rethinking this. There is an easier way. spdt momentary (a b c) and spdt latching (1 2 3)

b - to ground (sleeve of jack)
a - to 1
c - to 3
2 - to centre wire (tip of jack)

I can confirm that this works! thanks, I knew it had to be simple.  I ran into some problems with noise on my prototype when I added an LED, but I think it will be ok once I neaten things up...
thanks again.