Roger:
?Back to the circuit you posted in message #300
Simple cascode, with only 1 npn tr + 2 mosfets.
Since I found the 2SK3265, I removed the 2nd mosfet so its a very basic circuit.
66Meg, two 1 Meg, 100k+ 2.2M trimmer , 5.1V zener, 2SK3265, 2SC3311
Set trimmer for 900V, Vary input from 950~ 1150V, output only varied 5V or less.
I heated the circuit with a hair dryer, got it up from 25C to about 60C, voltage rose may be 5 or 6 volts. Good enough for me!
Its time to make it small enough to stuff inside my CDV-700 . I think the quiescent current draw while shunting was about 35uA when set to 900V with? about a 950V input.
It on the LHS of the attached jpg, circuit in message #300 is on the RHS
P
