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Re: Tube regulator for removing ripple . . .
Original poster: "Stephen Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>
At 12:23 01/04/03 -0700, you wrote:
>Original poster: "Mccauley, Daniel H by way of Terry Fritz
>I'm currently building a 4kV DC supply for my VTTC which will be used for a
>high-quality plasma speaker. The only problem is removing the ripple on the
>output of my full-wave rectifier
>Solid state would be nice but it is quite complex to get working
>correctly and relatively expensive.
I did something similar in a tube guitar amp that I built. You can see the
solid-state regulator that I designed/built here:
This circuit is a combination of a capacitance multiplier and an ordinary
regulator. It uses 600V MOSFETs and gives 475V DC out with 0.1V peak-peak
ripple. It has been in service for 3 years now with no problems.
To up the voltage rating, you could replace MOSFETs M1 and 2 with that
series chain thing you developed. Or you could replace them with tubes. The
EL509 is a relatively cheap power tube with about 30W plate dissipation. It
can't take 4kV plate voltage, but that might not be a problem since it
wouldn't see that much unless you shorted the HT.
P.S. I later found out that guitar amps sound better with _un_ regulated
power supplies. I would second the comment that you're probably better to
just use a big choke.