I have not found any crowbars with an inductor delay but I did find this=20
one that uses a capacitor delay. It looks like the only change needed=20
will be the SCR to bring it up handling full output power. Also, from=20
the other posts it appears to be a good idea to fuse the output in case=20
it is used as a battery charger or other external threat!

http://www.electronicdesign.com/files/29/21679/fig_01.gif

On 7/25/2012 1:52 PM, John Ferrell wrote:
> On 7/25/2012 11:21 AM, Bob Blick wrote:
>> ment I am thinking that an external crowbar circuit (SCR +
>> ZENER + RESISTOR) might be a really good idea...
>> A series inductor is useful in a crowbar if you expect the SCR to
>> survive. This is fairly standard in high current power supplies. It
>> slows the current long enough for the SCR to fully close.
>>
>> Best regards,
>> Bob
> Thanks for the tip, I will study up on the subject!
>

--=20
John Ferrell W8CCW
=93During times of universal deceit,
   Telling the TRUTH becomes a revolutionary act=94
      George Orwell


--=20
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