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In Reply to: RE: 5687 & OB2 as an excellent HT regulator posted by TimFox on February 25, 2015 at 07:31:18
Thanks for explaining this to me (us). Will the effect of adding a film cap across OB2 be the same as adding a cap accross the zener diode? I never liked that, it sucks the life out of high frequencies. How is a value of this cap related to high frequency roll-off?
Follow Ups:
Putting a capacitor directly across a Zener diode, which shows a very low resistance when conducting, is not very efficient as a filter. A series resistor between the Zener and the capacitor improves the filtration dramatically (so long as the rest of the circuit allows the series resistance). Gas VR tubes have a maximum capacitance specification, typically 0.1 uF, above which they are liable to relaxation oscillation (cool flashing light, but otherwise useless).
But this is powering an SPDIF buffer is it not? Nothing you can do to this power supply can affect the audio frequency response as being suggested. Round the signal off too much or apply too much ringing and you will get errors. That is hear clicks and pops.
Want to "liquify" the high end just a tad? Well with digital audio you will need to learn DSP programming. Because tweaking a cap in the power supply ain't gonna do it!
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