[sdiy] power-question

[Happy Harry]

uhhh... yeah what you said.

Terry is correct here. I'm all wet !

You can still use the zener to drop the voltage. Its a better way
than a series resistor, which varies the drop with current.

H^) harry


>From: Terry Michaels <104065.2340 at compuserve.com>
>To: harry <harrybissell at prodigy.net>, synth <synth-diy at node12b53.a2000.nl>
>Subject: Re: [sdiy] power-question
>Date: Tue, 5 Jun 2001 10:30:16 -0400
>
>Message text written by harry
> >My favorite way would be to put a Zener diode in series with the 
>regulator
>input...
>maybe a 6.8V zener. Then 6.8V is dropped in the zener, leaving 6V for the
>regulator... If the input voltage drops, the Zener will go out of avalanche
>and the voltage drop will  be mostly in the regulator.
>
>Many diodes in series would give the same effect...
><
>
>Hi Harry:
>
>That's not correct, if the input voltage drops, the zener will maintain a
>6.8 volt drop until there is no headroom left on the regulator, and it will
>then go out of regulation.
>
>Terry Michaels

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