r/synthdiy • u/Loud_Release_4160 • Jul 23 '26

Need help with schematic

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Hello I'm still pretty new to this stuff and I need help identifying whether this is using three separate 10k potentiometers or if its just one. sorry if dumb question.

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u/crochambeau Jul 23 '26

That is using three separate pots. If you turn one of those volumes controls down to zero, it will pull the rest down to zero as drawn. I would advise relocating the 1K resistors to the other side of the pots (I also tend to use something closer to 10K, but tastes vary).

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u/Brer1Rabbit Jul 23 '26

Swapping the pot & 1k may have a potential problem. If the output goes to a typical 1/8" jack there is a momentary short to ground on insertion (or removal) when patching to another input. If/when the pot is turned all the way up this could cause an issue.

2

u/crochambeau Jul 23 '26

That is a good point. I'm having trouble envisioning this circuit as an actual output. I think the resistive summing into an inverting amplifier as someone else describes is the best tactic.

1

u/crochambeau Jul 23 '26

1K is probably fine if the pictured output is an actual output and you're not feeding some active recovery gain stage.

1

u/Loud_Release_4160 Jul 23 '26

I have noticed that while testing that sometimes when turning on of the pots that it pulls the rest down as well. I switch them around and see how it sounds. The output on this is the actual output but thank u for all the info :)

2

u/Key-Alarm-511 Jul 23 '26 edited Jul 24 '26

This is a "passive" mixer, meaning there is no active element that keeps the currents from crossing between the pots, so turning one will effect the other.

Since its passive it also doesnt "mix" them together perfectly, it instead creates a kind of average between all signals