Switching Question

[jfrey]

Say you have a 3dpdt and a momentary switch. Is there a way to wire it such that if on it is momentary off and if off it is momentary on?

[Bellyheart]

The Fuck Overdrive does this with a switch. Bri should be able to help ya...I honestly can't think of how, but don't really know shit. There definitely is a way though. I know that.

[Jero]

Pretty sure that it wasn't supposed to do that (fuck), just an accidental thing that doesn't hurt.

[Bellyheart]

I'm speaking of the momentary switch that has a switch that toggles it in the way jfrey seeks.

[Officer Bukowski]

Good call on the fuck od bellyheart! I have one and it didn't even cross my mind.

Yeah with the fuck od the momentary switch toggles between regular od and momentary fucked up sound, or you flip a toggle and the momentary switches between fucked up sound and momentary regular od. Hopefully that makes sense.

Talk to Brian!

[jfrey]

Hmm, not sure I got across what I want. I don't mean having a toggle that changes how the momentary switch works. I mean is there a way that if the pedal is "off" the momentary switch acts as a momentary on, and if the pedal is "on" the momentary switch acts as a momentary off?

[eatyourguitar]

I'll draw you a schematic later. I have done it before. my PC died last night so no DIY layout creator

[multi_s]

you can do it this way.

interactive simulation at the link.

the XOR gate outputs "high" when only one of the inputs is high. cryptic, but it does exactly what you want.


http://www.falstad.com/circuit/#%24+1+5 ... +toggle%0A

[eatyourguitar]

I like it but I dont think you need it at all if your switches are both DPDT. you can still do it in switches alone without the relay. I'll do it in my sleep and I'll give you the answer when I wake up.

[multi_s]

ok this will be cool to see. off the top of my head i can only think of a scheme which is not true bypass (assuming dpdt).

[Jero]

I'll do it in my sleep and I'll give you the answer when I wake up.

Oh ok Zachary

[eatyourguitar]

I consider this to be a partial failure but I'm not giving up yet. the only bug is that the LATCH EFFECT ON + MOMENTARY BYPASS = board output connected still connected to output jack. not a big deal since there is a floating input on the board in. as long as its not high gain or prone to picking up RF, the board output should be silent.

notice I left a row open for the LED. if I use all 3 poles on the latching, I can do it better. but you would need to use a 4PDT latching to use an LED.

I need to draw that up. I'll be back

[multi_s]

i dunno i might not be following right but i dont see how that could work.

consider these 2 scenarios. Assume in the first for each switch the center lug of each column is connecting to the top lug of each column.



follow the red squiggly you see it gets to the input of the effect, and that the green squiggly gets to the out. So lets assume this is effect on and momentary would cause the effect to turn off.

now the second case, assume the latch connects the center lugs to the bottom lugs. this should be the effect is OFF but the momentary turns it ON. However follow the red and green again you see that the effect is receiving the input signal AND that the output of the effect is going to the output of the switching scheme.



is the interpretation correct?

if so regardless of what the momentary achieves, the latching setup is not correct.

you can do it with a spdt latching and adpdt momentary with the same caveat you mentioned this had, which is in some states, the output of the effect is tied to the output but there is nothing connected to the effects input so presumably it may be acceptable. moving to dpdt latching as far as i can imagine will not improve the situation.

edit: not to say i know for sure there is no way to do it with the switches mentioned above, i just dont follow how this is it. to me for true bypass you will needa 4pdt for momentary and dpdt for latching.

[eatyourguitar]

ok I see it now. it is wrong. I have done similar things in passive attentuators where its ok to short the in>out>volumepot on the same junction. thanks for pointing that out. I'll keep working on the 4PDT/3PDT version. It might just be easier to use nand and relays like you said.

[multi_s]

there may be other solutions but these are the 2 i thought of.

the top one is if somehow you had 4pdt momentary.
the bottom one is if you only have dpdt momentary and is not true bypass.



sorry the writing is sloppy but im sure you get the idea.

you can reduce the top solution to the bottom one and get the same result without true bypass. the input of the effect is always connected which is probably less of a problem then a floating in with the output always connected. use dpdt latch for led etc....