[vcf-midatlantic] A little electronics hack

Mike Loewen mloewen at cpumagic.scol.pa.us
Sun Sep 29 23:41:06 EDT 2019


    I'm no expert on those circuits.  Dave McGuire could probably offers 
suggestions.  Here's some further reading:

https://en.wikibooks.org/wiki/Practical_Electronics/Crowbar_circuit

On Sun, 29 Sep 2019, Evan Koblentz wrote:

>>> 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/
>>
>

Mike Loewen				mloewen at cpumagic.scol.pa.us
Old Technology				http://q7.neurotica.com/Oldtech/


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