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Re: [TenTec] Airpax Breaker Part and Source

To: tentec@contesting.com
Subject: Re: [TenTec] Airpax Breaker Part and Source
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
Reply-to: geraldj@weather.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 02 Jan 2011 14:42:53 -0600
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Crowbars are usually a fast shut down to protect from over voltage (like 
a shorted regulator transistor). Current limits shut down the supply 
when overloaded without shorting it out, they just cut back on the drive 
the pass transistors.

73, Jerry, K0CQ

On 1/2/2011 2:31 PM, nl7vl wrote:
>> The question is, how fast does a fuse or circuit breaker have to be
>> to protect the final transistors?  It may be better to build an
>> outboard circuit that duplicates the over-current circuit inside the
>> Ten-Tec power supplies.  I've tripped the power supply for my Corsair
>> many times without damage.
> So what you are getting at is recreating the crowbar circuit to trip
> things just like the AC supplies do? (At least that's what the Century
> 21 does off the top of my head.)
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