In article ,
Fred McKenzie wrote:
There is an IC that might get you started, the NE-555. Other sources
make it, but always with the "555" number.

This chip can be configured to start timing on command, and charge-up a
capacitor through a resistor, until a preset time has past. At that
point it should reset and generate an output pulse or level shift.

The trouble with this approach is that it is best for short time delays.
Ten minutes is a relatively long time, so circuit leakage may cause the
delay to be longer than what you would calculate based on the R-C time
constant.

If you use the CMOS version - usually 7555 - the low current allows times
of much more than 10 minutes.

--
*Even a blind pig stumbles across an acorn now and again *

Dave Plowman London SW
To e-mail, change noise into sound.