#1

i’d like to build the simplest voltage source controller possible - thinking four 100k linear pots wired up to a 9v battery in parallel. do i need to buffer or do any protection circuitry?

this would be used to control eurorack (if that wasn’t already obvious!) but doesn’t need to fit in a rack.

any tips?

#2

My suggestion would be to use a lower value of pot like 10k so that your largest-case output resistance is lower. Lower pot values will drain your battery faster but there will be less chance of loading effects. Then for protection I’d add a 1k resistor in series with the wiper of each pot.

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#3

Hiya just following up on this.
What if i did want to use the +12v rail on my power supply? Voltage regulator, pots in parallel, protection resistors… anything else? Doesn’t need to be super precise…

#4

Most of the same stuff applies. However you might want to add a resistor in series between +12V and the pot so that the max output voltage is 10V (or whatever you want) instead of 12V.

As for power supply protection I suggest that you study the schematic for Shades by Mutable Instruments (which you can get on the mutable instruments website). I’m no expert here but I think a series diode is a reasonable strategy.