Momentary switching x 3

[Kit]

Hi

I need to switch between 3 channels/loops in my rig.
The switching has to be momentary footswitches.

Function:

Stomp on channel 1. Ch.1/ON Ch.2/OFF Ch.3/OFF
Stomp on channel 2. Ch.1/OFF Ch.2/ON Ch.3/OFF
Stomp on channel 3. Ch.1/OFF Ch.2/OFF Ch.3/ON


Now, I know how to do this with relays or analog switches......... but I was wondering if there is some special purpose,clever logic IC that has this function built in? Would save me money and trouble.

Some kind of three input/three output exl. device?

Any suggestions are most welcome.

Thanks.

 

[shabtek]

I would use 2 switches. "scroll' and 'select' scroll would provide pulses to a decade counter that has it's outputs each going to an (input set/reset?) of the flipflops."select" would toggle the set of flip-flops that drive relays or whatever

 

[JohnRoberts]

You aren't clear... one button to rotate through three modes, or two buttons to step or or down through three modes, or three buttons to latch one of 3 modes?

Neither sounds very difficult...

JR

 

[gemini86]

I'm pretty sure he meant 3 buttons, one for each latching channel, but would disable the other two simultaneously.

also very interested in this.

 

[EZ81]

Page 3 of this pdf has a schematic (using two logic ICs) which might be what you need: http://www.schematicheaven.com/newamps/soldano_x88r.pdf

HTH
Matthias

 

[Kit]

I'm pretty sure he meant 3 buttons, one for each latching channel, but would disable the other two simultaneously.

Yes, thats what I meant. Sorry if I wasnt clear enough.

Page 3 of this pdf has a schematic (using two logic ICs) which might be what you need: http://www.schematicheaven.com/newamps/soldano_x88r.pdf

Thats what I need. Thanks.

Feel free to post your thoughts and ideas on this.
Im sure there are many ways to solve this.

 

[JohnRoberts]

I made a 3 button, 3 function foot switch for a tape recorder remote back in the '80s. I used some simple CMOS set/reset flip flops to latch the desired logic. You can bus a reset so pushing any button resets all three, than a path where the individual buttons latche the desired FF output.

Any parallel latch with more than 3 lines could be configured to latch individual button presses. I don't know if there are common CMOS parts to do this in one package, a few FF are pretty cheap.

JR

 

[babyhead]

Im not sure how it is implemented, but my Demeter preamp has channel switching with Vactrols, FWIW. I dont think you could use momentaries with them though.

 

[Rochey]

this can be done on the msp430 board I've put together.

http://www.youtube.com/watch?v=YQ7cagWZEL4

In the next few weeks, I'll get 'round to releasing them, as well as the basic code I have running. Modifying to set certain I/O on the 3 GPO will be possible.

stay tuned.

Cheers

R

 

[AudioJohn]

Your requirement can be accomplished with a single CMOS 4001 - (search for the Quad 34 pre-amp schematic) - which is available on the Web - although the Soldano/Randall Aiken circuit is fairly simple.

There really ought to be an IC to perform this function - in the past there have been devices from Plessey (ML231 rings a bell?) - but this is really ancient history. There have been others - but is anything modern available now?

 

[gyraf]

we use some sort of a integrated 6-channel television-channel-switcher IC for stuff like speaker select and such. I don't have the number around here (SAJxx? SABxx?) , but it has everything integrated and is easy to use..

Jakob E.