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Thread: EE challenge PIC && 12V
www.piclist.com/techref/power/batterys.htm?key=12v
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face BY : Roman Black email (remove spam text)



GMorbe wrote:
>
> Hi all,
>
>  thanks for your comments that far. Most of your suggestions tend more or
> less to eitherone of my initial concepts except using a reg with a shutdn
> capability which is a third idea.

> By taking a cheap reg or even a zener then add up 2 transistors, 3 diodes
> and some passives, i think there will be no big difference left compared to
> the LDO, but it needs to be calculated more exactly to say. The discrete
> approach however relies on standard components only.

1. I think you can do it with one transistor/fet. Maybe on
the -ve leg of the battery with some lateral thinking.

2. Diodes and transistor VERY cheap in large quantities,
especially when you factor in the ability to buy broad
spec of parts of reasonable compatibiity, cheapest
tender, specials that month, etc etc. Much better for
your manufacturer, and safer when supplies are
unpredictable.

3. I would look at running the transmittrer section
straight from the battery in a way that it is normally
off. This means your reg only has to do the pic.
So you can use the tiniest of zeners for the reg.

4. I would definitely choose an option that is
completely open circuit when off. Those 23A 12v
batteries are hard to get and expensive. Very
annoying in remotes that go bad when you haven't
used them for a while. We sell these batteries,
to lots of annoyed people I might add! ;o)
-Roman

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