An op amp/ voltage comparator with a zener diode feedback loop from the
output, isolated from the input by a capacitor works just fine. The zener
value determines the 'set' point for the auto shut down. Get an op amp that
will handle the voltage. An o-82 goes up to 36 volts. Radio shack sells
em. Most others are rated between 6 and 18 volts and will burn out.
It takes hours to hand wire the setup which must include current
regulation in order to function.
ken
At 11:59 PM 7/16/00 +1200, you wrote:
Maybe a voltage (or current) comparator opamp with a fet switch?
If any one nuts one out, please let me know.
Ivan.
----- Original Message -----
From: "Robert L. Berger" <bober...@swbell.net>
To: <silver-list@eskimo.com>
Sent: Sunday, 16 July 2000 06:14
Subject: Re: CS>Away too long
> Hi Erwin;
>
> I haven't found out how to program a relay with a selectable window
for shut-off.
>
> Given me a schematic and I will paly with it.
>
> No doctor just a crotchy old guy'
>
> "Ole Bob"
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