While true, the key point remains; you are better off not allowing excess PSU generated noise through to the output in the first place than you are attempting to compensate for it later.
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13 years ago
amp new PSU capacitors
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13 years ago
Is there the same racket coming out of the tape monitor output?
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13 years ago
Good point. i.e. without the power output stages. Didn't think to check that. Well, I'm going to put trailing leads in the PCB where the caps were and put the thing back together. Then I can experiment to check it is the caps. Then I'll leave any new caps on the end of short trailing leads and wedge them in place somehow. I'll let y'all know how it goes. Simon.
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13 years ago
"The Natural Philosopher"
** Can you read your own words ??.... Phil
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13 years ago
Smplistic exaplanatin: A voltage regulator is an audio amplifier configured to have zero AC input and a precise DC output :-)
I.e it makes little difference where you put your supply ripple rejection. Its the same amount of componentry.
It s not hard to ensure that the supply rail rejection of an audio amplifier even before feedback is applied is well up in the 80-100dB range: Adding feedback takes it to the completely inaudible.
To think otherwise is to be beguiled by HiFi Bullshit merchants.
Remember, when te music stops, so does the current drain on a class B amp. There is bugger all ripple to break through.
Under power, the music is so damned loud you wont hear any hum breakthrough that's 100dB down on the signal anyway.
The only time you hear it is if its faulty, or you are clipping to it.
Or in terms of odd harmonic distortion if there is resistance in it and your supply rejection is crap. But as I said, supply rejection is one of the things that is relatively easy to get very very good . Constant current balanced pair phase splitters.. even cascaded transistors remove miller effects from the high voltage swing transistors..Christ even the 'all on a chip' power amps have all that.
The proof of the pudding is in the final distortion products you achieve at highish powers. .