[vcf-midatlantic] A little electronics hack

Evan Koblentz evan at vcfed.org
Sun Sep 29 23:05:26 EDT 2019


>> It's called a 'crowbar' circuit.  Prevents things from burning up.

Thanks. I've heard that term (and seen it used on this list) but never knew
what it meant.

What are common reasons why those stop working? Neville and I didn't see
any obvious signs of damage to it.

On Sun, Sep 29, 2019, 1:56 PM Mike Loewen <mloewen at cpumagic.scol.pa.us>
wrote:

> On Sun, 29 Sep 2019, Evan Koblentz via vcf-midatlantic wrote:
>
> > Neville noticed something that I wouldn't have. The circuitry contains a
> > safety mechanism to shut off all power if the current jumps too high,
> such
> > as a kid inserting a paper clip. There's probably a technical name for
> that
> > but I do not know it. Anyway, for unknown reasons this circuit was
> kicking
> > in! He jumped it with an equal-length wire. :)
>
>     It's called a 'crowbar' circuit.  Prevents things from burning up.
>
>
> Mike Loewen                             mloewen at cpumagic.scol.pa.us
> Old Technology                          http://q7.neurotica.com/Oldtech/
>


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