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In Reply to: Re: Sand posted by Henry Pasternack on December 15, 2006 at 08:25:06:
Dear Henry,Thanks. A few considerations:
First, the increased current demand, when using a bleeder resistor, will lead to much higher ripple.
When no current (or a few uA) is required, the PSU will be much ‘quieter’. To (unnecessarily IMHO) increase ripple only to filter it out again looks odd to me. I calculated that when you use a regular 4H choke, the minimal current to reach critical inductance is 21 mA or so, say 30mA.
I did some simulations, from which I conclude that you really need to take rather humongous filter measures to keep the ripple below 1mV when you bleed off 30mA, while you can easily go down to a few uV when no current is required using CRCL filtering. This, of course, will result in high DCR of the PSU, so that the only way for me to create a low resistance path from grid to ground is a low value adjustment pot with on leg grounded…
Further, I will use tube rectifiers. Diode hash looks to me less of a problem than. Of course you are still right that still the diode conduction waveforms would be nicer.
Thank you for you considerations about common mode filtering.
Regards,
NC
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