Bill Horne <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Mike,
I understand, and perhaps "Crowbar" is the wrong term: there's certainly
enough technical expertise on the list to suggest a viable circuit.
Here's my idea: if bias drop below 50% of normal, then we could trigger
an SCR to short the AC source and blow the fuse.
73, Bill W1AC
Mike Bryce wrote:
Mike Bryce <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Gosh..
I thought about that, but here's no way to crowbar the bias circuit.
in the old supplies, the damage is caused by a "lack" of bias. So, if
there is a failure of the bias supply, i.e. it quits, how can you fix
that?
the only way I could come up with would have been a system that
deprives the transformer of it's primary voltage, shutting down the
supply. It would have to default in the off position too, as you would
not want the supply to cycle on, find the missing bias, then shut
down, the power up, find the missing bias supply, shut down and on and
on.
mike
Mike, WB8VGE
SunLight Energy Systems
The Heathkit Shop
http://www.theheathkitshop.com/
J e e p
o|||||||o
Note: No trees were killed in the sending of this message, but a large
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On Dec 15, 2007, at 5:28 PM, Bill Horne wrote:
Bill Horne <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Is there a provision in the kit for a crowbar circuit to safeguard the
rig if the bias (or other) supply fails?
Bill, W1AC
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