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From: "Anthony Q. Bachler"
Subject: Re: How to use a zener diode for voltage regulation?
X-Newsreader: Microsoft Outlook Express 5.50.4133.2400
Date: Mon, 09 Sep 2002 09:50:56 GMT
NNTP-Posting-Date: Mon, 09 Sep 2002 02:50:56 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
actually put the zener across the load after R1 and the zener will protect
the load, in your circuit it will only protect it for the few milliseconds
it takes for the smoke to escape. Like this:
The american people did to themselves
what Osama bin Laden could never do,
took away our freedoms in exchange for
a false sense of security.
"madcat" wrote in message
> "l.a.n.g.e.l" wrote in message
> > I'm trying to put one of those super bright LED into a circuit.
> > The forward drop at 11.96V is around 3.05V and at 6.3V, it's around
> > 2.87V.
> > The problem is the voltage fluctuates.
> > I've never used/seen a Zener diode but reading suggests they can be
> > used for this, but the application examples leaves me baffled since it
> > appears that the current cannot be controlled.
> > Thus would something like this work if I just want to use very basic
> > (read cheap *grinz*) components like resistors and diodes?
> > +6V~12V +---ZD---R1--LED-----Gnd
> > Where
> > ZD is 5.1V Zener
> > R1 is 110 Ohms
> > LED forward drop is 3V, 20mA nominal.
> A zender diode only will protect you against higher voltages, do if you
> en zener diode (in sper) like this
> | |
> zener load
> gnd |---------
> and your 5V is not 5V anymore, the zener will be open and the "load" is
> protected against anything higher then 5.1V
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