Re: 12v battery protector circuit

From: andy (news4_at_earthsong.free-online.co.uk)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 21:03:48 +0100

On Fri, 27 Aug 2004 12:29:39 -0500, John Fields wrote:

> On Fri, 27 Aug 2004 18:55:36 +0100, andy
> <news4@earthsong.free-online.co.uk> wrote:
>
>
>>That's looking promising -
>
> ---
> "That's looking promising. Thank you." would be so much nicer, don't
> you think?

OK, thanks.

>>the LMC6762 would also do nicely instead of the
>>393 in the main circuit I reckon, which should cut down the current a
>>fair bit more.
>
> ---
> Maybe, maybe not. the LMC6762 has push-pull outputs, so if you need an
> open-collector output, you're out of luck.

push-pull would actually be better - the open collector on the 393 just
meant that it was taking more current than needed with the output
transistor on so that the resistor could pull the output high enough when
the transistor was off.

> ---
>
>>The only thing I'd like to know is whether this is a fairly
>>standard part that's easy to get hold of, or is it one that's likely to be
>>out of stock or discontinued? (Thinking about if I publish the finished
>>design, and someone wants to build one a year or few from now.)
>
> ---
> Jesus, Andy, do some of your own leg work for a change. It's easy
> enough to do, just point your browser around and find out who's got
> what in stock. Since National makes the part that would be the
> logical place to start, and here's what they have on it:
>
> http://www.national.com/search/psearch.cgi?keywords=LMC6762

Sorry. I had a look, and it's less common than the lm393 (ten times less
hits on google, and stocked by only 2 out of 4 uk electronics suppliers I
looked at). So not so good from that point of view, but the low power
might make it worth trying. 

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