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Re: black gates in parallel

The polypropylene caps should be placed as close as possible to the electrolytic. I’ve found monolithic capacitors to be the best by far for decoupling. I can’t remember how I came to this conclusion - perhaps it is their lower internal resistance or something.

In testing (years ago) I was convinced I could hear the difference. I changed the decouplers on some other people’s amps and they were very happy with the results as well.

The usual place for decouplers is right where the power supply lines meet the PCB. The other place is at the end of the power rail (follow the main power rail to its end then terminate it with a monolithic ceramic).

But this is not as simple as it sounds. I completed a design last year that buzzed when decouplers were placed at the end of the power supply rail, but all my power amplifier designs have been quieter with them.

Kind Regards,
Robert Karl Stonjek


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