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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Is The Last Cap In The PSU Still Important... posted by Lew on April 24, 2015 at 13:50:17:
If you reference the Walt Jung article you can see that the impedance begins to fall off at 1kHz or so at 6dB/octave. To put this in perspective, W. Jung measured the rejection of the cascode DN2540 CCS at 1kHz to be -150dB. This represents an impedance of about 32M ohms. At 130kHz this drops to about -115dB. The impedance is now about 560k ohms, a fifty fold difference. Why be concerned about this out of audio band crap? Because devise nonlinearities can inter-modulate this crap with the audio signal. That's why I believe it's best to not generate this crud in the PS in the first place.
"It is better to remain silent and thought a fool, then speak and remove all doubt." A. Lincoln
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Follow Ups
- RE: Is The Last Cap In The PSU Still Important... - JKT 14:15:15 04/24/15 (2)
- RE: Is The Last Cap In The PSU Still Important... - Lew 09:00:33 04/26/15 (1)
- RE: Is The Last Cap In The PSU Still Important... - JKT 13:20:38 04/26/15 (0)
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