CMOS Switching Pots

R

rossbalch

Active member
Hey folks, I have a question about using CMOS switching for potentiometers. (CD4053 in this case)

I want to build a pedal that is a Tube Screamer and a SD-1. Both circuits will be on the same PCB, but I want each to be a "mode" with a push button (in this case because I like to build "studio" versions of stuff) that switches the IO and the potentiometers between the two different circuits, and an LED indicator to show which mode is active.

To maintain the sound / headroom the circuits will be fed by a single +9v source, but to avoid biasing the CMOS switching inputs, the switch will be powered by +/-12v.

Will this plan work? I know that CMOS IO have some level of resistance, but hopefully this won't affect the circuit too much?
 
I was planning on using a CD4013 to actuate the logic, but what is the best way to use the same CD4013 to switch between the LED states? Ideally I want it to switch between to LEDS, a Green and a Yellow.
 
jwin615 said:
Use dual gang pots and switch the IO mechanically. Why CMOS switches?
Click to expand...
Most relays are DPDT, so you need 1.5 relays where you could use a single CD4053.

I don't think dual gang pots will work because I've never seen a dual gang W20K.

Also, honestly, I want to learn how to do this for future more complicated projects, and this is a fairly low stakes way to learn how to do this.
 
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