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In Reply to: RE: CLC / Snubbers posted by Eli Duttman on April 01, 2017 at 13:03:21
"Run a simulation with CI/P - LChash filter - LCreservoir topology."
Well, yes, if a large amount of reservoir capacitance is added at the output, it attenuates almost everything. Is that the technique we're discussing? I thought you were talking about adding a RF hash filter to the existing doubler in the Cit II. Do Jim's mods include a hash filter plus another large bank of capacitance? That certainly makes the task easier. I just assumed there wouldn't be space for all that.
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Buy Chinese. Bury freedom.
Follow Ups:
It all fits. :> D He uses 820 μF. caps in the doubler stack. The principal filter choke is the excellent OEM part. Jim gains space on the cap. bracket by moving the bias supply off of it. Capacitance galore in the doubler, reservoir, and decoupling positions. Something in excess of 130 WPC pulse is available. That PSU has brass monkey cojones. The "hash" filter is a small refinement of his already very nice work.
The linked cap. bracket photo is somewhat dated, in that parts brands have changed over time. The pair of isolated gray caps. are the doubler stack.
Eli D.
According to my sim, the original Cit II PS has a significant impedance bump around 25-30 Hz. That's due to the factory values for the choke and reservoir cap. Making the reservoir larger mitigates that issue. Anyway, this is very different than what I thought you were describing when you mentioned adding a hash filter. The model I posted is valid for that, but it doesn't include a large smoothing capacitor (reservoir) afterwards. I might have to bite the bullet and take the same approach in my rebuilds. The 500mH chokes will work if I do that, it's just a matter of adding enough output capacitance to push the resonance bump to a lower frequency. Good discussion, thanks!
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Buy Chinese. Bury freedom.
Edits: 04/01/17
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