Ive been using the IXCP0M90S, good to 900V at 1-100ma. Keeps those sensitive
screen grids safe from over current or collateral damage when there is an
internal failure.
It does keep 8122's happy in my case.
Carl
----- Original Message -----
From: "Paul Christensen" <w9ac@arrl.net>
To: <amps@contesting.com>
Sent: Thursday, September 27, 2012 12:52 PM
Subject: Re: [Amps] Novel Screen Grid Regulator
Jim,
Very interesting circuit since the MOSFETs function like a high-power,
active voltage divider. I did note that the non-inverting input to U1a
may be susceptible to the effects of both the normal screen voltage and
perhaps a flash from the screen. However, provided that Z1 acts quickly
enough and R10 remains intact, then concern is probably minimized. Still,
it may make sense to Zener-clamp the non-inverting op-amp input to a level
just above the value found in normal operation. Then, if adding
Zener-clamping, I think it would be a good practice to add series R at the
non-inverting input of 1K. The input Z to the non-inverting input of the
LM358 is quite high, allowing for some additional series R protection.
Paul, W9AC
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