Subject: Re: Easy question, I hope!
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Date: Thu, 07 Nov 2002 09:40:06 GMT
NNTP-Posting-Date: Thu, 07 Nov 2002 10:40:06 MET
"Randy" schrieb im Newsbeitrag
> Hi people,
> I have been looking around for the last few days for a particular
> application of electronics that seems so fundamental in nature, yet I
> can find no schematic or design that cites it anywhere I look.
> What I'm looking for is essentially a low-voltage version of a
> spark gap. If enough voltage is applied across it, current will flow,
> else, no current flows. Here are its properties:
> 1) Uses no external power source
> 2) dissipates little or no energy in "off" mode
> 3) resistance approaches infinity when the applied voltage is less
> than V0
> 4) resistance goes to zero when applied voltage is greater than V0
If resistance is zero and the voltage is higher than zero, then the current
will be infinite!
> I was pondering that a Zener diode might get the job done, but I'd
> like to hear your opinions, too.
A zener keeps the voltage at Uo.
A thyristor is very much like a spark gap, when you connect the gate through
a zener with the input you can fire it at a desired voltage and the device
keeps the voltage to around 1V until the current gets smaller than the hold
electronic hardware designer