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Yes, exactly right...

"At 1kHz the ratio (with values as shown) is 11,855:1 and the output Z of the PS is (all but) entirely a function of the cap."

When I monitor the audio voltage across the last filter cap with the amplifier operating, all I want to see is very, very low frequency energy. The presence of that energy is nearly unavoidable, because the power supply components comprise a low pass filter. Note that in order to reduce ripple to manageable proportions, the filter need only attenuate 120 Hz and up. However, to establish a low Z voltage source for the power amplifier, the filter output must provide effective bypassing down to less than 20 Hz. These are two separate functions, but neither can be compromised without degrading the amplifier's performance.



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  • Yes, exactly right... - Triode_Kingdom 08/26/1220:43:26 08/26/12 (0)

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