On Wed, 2009-04-01 at 13:55 -0500, Hulett, Russell wrote:
> OK, you've convinced me that a Zener transient protection won't work and to
> build a crowbar using a zener and an SCR. Looked at the Handbook circuit
> with the transistor trigger for the SCR, and Ten Tec sent me the circuit used
> for the 280 PS crowbar. Most of the other crowbars I see on the web look
> like the latter, so the 280 example is probably what I will duplicate.
>
> What I was hoping to find out was what other 252/262 owners had added to
> their old power supplies to make them safe to use.
>
> Thanks for the help.
>
> 73, Curt KB5JO
Yes the handbook circuit is more complex and more expensive (at least
ten cents for the added transistor) but I think the capacitor there
helps keep down transient and RF triggered nuisance trips
73, Jerry, K0CQ
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