>
>
>On Thu, 12 Apr 2001 09:13:55 +0100 "Steve Thompson" <g8gsq@qsl.net>
>writes:
>
>Hello Steve & the group,
> I finally got a moment to read all this screen mail...
>
> The original query was about how to protect a "string of zeners" shunt
>regulator.
>
> One answer is with a SCR crowbar across the zeners, to which Ian
>mentioned a reference (which I haven't seen) & then alluded to other
>circuitry.
>
> Triggering may be simply implemented by connecting the gate of the
>crowbar SCR to a small value R in series with the bottom of the zener
>string. So, in this case, the other circuitry is a single R.
>
good point. It might be better to connect the SCR gate only across the
bottom zener.
cheers, Marv
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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