|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
24.164.206.112
In Reply to: Re: Unreg or reg PSUs ? any improvment ?! posted by Lew on February 28, 2005 at 07:25:19:
Hi Lew,Thanks for your reply, Lew. Since the output supplies float, I was assuming that I would need a resistor for both the negative and positive sides of the caps in each phase. For the two capacitors in each phase, a one-ohm resistor would "bridge" the negative terminals together, and another resistor would bridge the positive terminals together in each phase. I am referring to Paul's power supply tweak schematic (URL attached), where he does this with four caps and six resistors per phase of the amp, three resistors on the + side and 3 resistors on the - side for each phase.
Hope I haven't confused you (and me)more!
Thanks,
William
Follow Ups:
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.
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.
This post is made possible by the generous support of people like you and our sponsors: