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Adding 2 cooling fans to an amplifier circuit board

Electrical Engineering Asked by Errol on December 21, 2021

schematic

simulate this circuit – Schematic created using CircuitLab

I’d like to add (2) 5v .41A cooling fans to this Vox bass amp. What Resistor/capacitor combo (R3/C4) would be best?

One Answer

You need to investigate Voltage Regulators (LM78xx-type, but suitable for 40V or more input) and/or Buck Converters. And also use a bridge rectifier, since you now have a magic ground that's connected to nothing. The electrons can't read your mind about where you want them to go, so they won't go.

Series resistors are the worst possible method to make a stable and reliable voltage for anything that hasn't got the most stable current consumption imaginable. Audio circuits do not qualify for stable power needs.

Answered by Asmyldof on December 21, 2021

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