Re: Help requested for LM318

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From: Ian Stirling
Date: Tue, 29 Apr 2003 16:44

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In sci.electronics.design Werner <Werner@nospam.com> wrote:
> Hi fellow electronics enthusiasts,
> 
> I'm trying to build a on/off detection circuit, which is able to check if
> the connected LCD monitor TV is in standby mode (31 mAmps/12 volts) or
> active mode (725 mAmps/12 volts). I have put a 0.3 Ohm resistance in series
> with the 12 Volts DC power supply, so I have a small voltage drop across my
> 0.3 Ohm resistance, maybe enough to measure this drop using an LM311
> comparator IC.

There should be no problem with oscillation.
Add a bypass capacitor across the resistor to cut down on any problems.

A simple 100 ohm/1.2K divider between 12V and 0V, and the comparator connected
to the TV end of the 0.3 ohm resistor.

-- 
http://inquisitor.i.am/    |  mailto:inquisitor@i.am |             Ian Stirling.
---------------------------+-------------------------+--------------------------
Lord, grant me the serenity to accept that I cannot change, the
courage to change what I can, and the wisdom to hide the bodies
of those I had to kill because they pissed me off.                  -  Random

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From: Ian Stirling <root@mauve.demon.co.uk>
Newsgroups: be.science.electronics,sci.electronics.basics,sci.electronics.components,sci.electronics.design,sci.electronics.misc
Subject: Re: Help requested for LM318
Date: Tue, 29 Apr 2003 16:44:17 +0000 (UTC)
Lines: 22
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