[sdiy] Signals leaking into the PSU?

[Florian Anwander]

Hi

Am 23.02.23 um 20:32 schrieb A.M. Barrio via Synth-diy:
> And finally, removed the LEDs from the LFO. This is what did it, it is 
> finally working as intended, no wiggling on the VCO output nor LFO 
> remnants on the rails. I will look into high efficiency leds, driving 
> them through current sources and ways to stabilise the amount of 
> current they draw.
The problem is, that there is current draw switched on and off, which 
puts a sudden load on the supply. The trick is to keep the current 
constant, but redirect it over a transistor (excerpt from one of my 
schematics):



The R19 should be fed by your U1C pin 8. If you have only 12V as supply, 
you should use a 3k3 or 4k7 resistor for R24.

Florian
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