On Wednesday 05 February 2025 04:45:28 pm wn4isx via groups.io wrote:
And my 5th bone of contention is their overvoltage crowbar sucks, it was obsolete in 1960 and is prone to false firing and also failing to trip when there was an actual overvoltage.
That crowbar circuit in the referenced pdf didn't make a whole lot of sense to me. Not that I examined it that closely, it's approaching the limit for what I can see on this monitor. But do you need that much? To me a zener diode, a resistor and a cap giong from gate to ground, and an SCR should probably do it. Oh, and I'd put a fuse immediately preceding that circuit. Getting just a bit more involved maybe use one of those 431 parts, then you could trim it to the exact voltage that you wanted it to trigger at.
How would you design one?
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Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
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