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In Reply to: Re: Unreg or reg PSUs ? any improvment ?! posted by Pathologymd on February 28, 2005 at 16:14:47:
If you follow Paul's advice, you will be doing the right thing. You (and Paul) are correct, one needs separate resistors for the plus and minus sides, which does add up to 4 resistors per monoblock for a CRC network.
Follow Ups:
Hi Lew,I contacted Bill Layer, and you are correct. He said that the factory M-60's use a 1 ohm 5W resistor only on the positive side. He said I could experiment with 0.5 ohm resistors on each polarity, but that it probably wouldn't help. Bill reminded me that the negative supply doesn't completely float, that it is coupled to ground through 600 ohms.
Thanks, Lew!
I think I am in at least up to my eyeballs if not over my head, but I don't see how it matters that the negative supply is grounded while the positive supply is floating, with respect to the CRC filter network. I yield to Bills' superior knowledge, but if it can't hurt, why not use CRC networks on both the positive and negative supplies? Were you able to check Speltz's Tweak? I haven't tried to access the old ASOG Tweaks pages, but I think they still exist. I believe that Paul did use CRC or CRCRC networks on both sides.
Hi Lew,Yes, Paul definitely uses CRC's on both polarities. I have the link to his tweak site on my post of 2/28 if you want to revisit it.
Thanks, Lew.
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