Re: on/off circuit

David Harmon wrote:
On Thu, 29 May 2008 17:38:01 +0100 in sci.electronics.basics, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote,
A monostable is what you need. Press the switch and it will stay on for X
minutes.

How would one design that in such a way that there would be zero (or practically zero) battery draw after it shuts itself off?

Power the "power up" circuit from the switched line, and from the 'on' switch.

If power is off, and the on switch isn't pushed, current draw will be the leakage current of the pass MOSFET, which will be minuscule.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html
.