Re: Tube regulator for removing ripple . . .

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jim Lux by way of Terry Fritz <teslalist-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

At 04:09 PM 4/3/2003 -0700, you wrote:
>Original poster: "Mark Broker by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><mbroker-at-thegeekgroup-dot-org>
>
>Pi filter - either LC or RC will work wonders.  The Pass Labs XA series 
>audio amplifiers (the XA200 runs about $40kUSD!!) use multiple series RC 
>filters for power supply ripple rejection.  I don't remember specific 
>details, but the filters use thermistors.  Pi filters are supposed to work 
>really well with class A loads (constant current draw), which sounds close 
>to what you're doing.  A few quick and simple SPICE simulations would be a 
>huge benefit, I think.
>
>As someone else suggested, a capacitance multiplier would be good, too.
>Although developed for an audio amp power supply, 
>http://sound.westhost-dot-com/project15.htm is a good example of a capacitance 
>multiplier, IMO.
>
>Isn't this whole thread a little OT?

Nahh.. I think it's on topic... Well filtered DC supplies for running tesla 
coils are definitely of some interest.

Here's another approach suggested by someone at lunch..

A standard 3 phase rectifier has only 8% ripple with no filter.  Some 
horribly complex and heavy combination of a induction motor (single to 
three phase conversion) and 6 transformers (star and delta connected) to 
make a 12 pulse rectifier should do even better.  Not only that, but the 
ripple frequency is 180 or 360Hz, making a small inductor/capacitor filter 
work even better.

Another thing would be to use capacitors on the AC line side to make 3 
phase from single phase.