Re: Low Voltage Cutoff Circuit

From: Ken Smith (kensmith_at_green.rahul.net)
Date: 08/25/04 

Date: Wed, 25 Aug 2004 17:59:02 +0000 (UTC)

In article <u4voi0plahs651s4o1kdqre8ia2bfhbs6f@4ax.com>,
Jonathan Kirwan <jkirwan@easystreet.com> wrote:
>Ah... But now that you've gone through all that, Win, what about "zero power"
>versions, eh? Remember the CD4069/4007 discussion a while back? Those 358
>circuits you just added suck power from that poor battery after it is already
>kind of down and out...

How about this:

Use a comparitor that allows the output to be pulled above Vcc. Have the
comparitor pull down on the gate of a P channel switch. Power the
comparitor, reference and divider on the load side. Put the start switch
across the output of the comparitor.

This way, it draws no power when off and latches off without any added
parts to make it do it. 

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