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RE: ALT. 1.

"Interesting.... try putting a 5K resistor across the current source."

I think maybe that damps the ringing down just a little. But it's a fairly marginal difference, I think. Another thing I've just tried is adding a 100 ohm resistor in series, immediately after the silicon rectifiers, as maybe a slightly closer approximation to a vacuum tube rectifier. The resonant frequency seems to shift up a tiny bit, and the amplitude of the modulation on the power supply increases somewhat, of course. Here's a simulation with the 100 ohm series resistor and the 5K shunting the current source also.

Chris




(I'm not sure why some of the wires in the schematic aren't showing up in this jpg file, but they really are there! I don't seem to be able to find a way of directly saving the LTSpice window as a jpg or whatever, so I've been resorting to taking a screenshot and then cropping it. There must be a better way?)

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