Switching with a momentary switch ?

[Basstyra]

Ok, so there is this AX-1B I want to mod, I want to add a bypass switch. But there isn't room for a 3pdt (or even a mere spdt which could control a relay) in the box, so I'm thinking of using a little momentary switch.

At this time, I'm thinking of using a D flipflop, the /Q output wired to the D input, the momentary switch wired to the clock, the Q output would change state every time I press the switch. The flipflop would control a relay, directly if possible (I doubt...) or using a transistor. The relay would be a 3pdt if possible, and would control the true bypass.

What do you think of that ? WOuld there be a better, simplier way to do this ?

[niftydog]

that sounds good to me. There are ways of using FET switching, but whether it'll be simpler is a matter of perspective! There are also ICs with large CMOS switching arrays inside them, like the 4066.

[Basstyra]

Any other opinion ?

[cjlectronics]

AX-1B...is this the Roland Keyboard/guitar shaped thingy?

CJ

[Basstyra]

No...

It is this :


A basic bass multi fx.

[depraved_fx]

Sounds like you have a good idea.  I have used that kind of circuit with a lot of success.  

I tied a 10k resistor to the VCC and connected the positive leg of a 4.7uF cap and the momentary switch in parallel to the other end resistor.  This connnection point feeds the clock input of the flip-flop.  The other leg of the switch and the negative leg of the cap get tied to ground.  I got this from what R. G. Keen did with his ASMOP project.  It works great to provide debouncing and have really stable switching.

Hope this helps.

Dan

[Basstyra]

Do you mean this ?


So the clock is active on a decreasing slope, and the RC circuit avoid bouncing. That's pretty simple and smart.

I'll test this soon, I'll let you know. It seems to be the best way to do this. Thanks !  :wink:

[depraved_fx]

That is exactly what I used for all of the footswitches on my project and they all work perfectly.  Hopefully that circuit will work the way you want it to.

Dan