🚀 go-pugleaf

To build a reproducible time delay of several seconds to 
a minute - or more - a good approach is to do it digitally using
CMOS.  Build an inverter based oscillator out of two resistors
a capacitor and two inverter sections (any good CMOS application
manual will show how).  Follow this with a multi-stage counter.
The counter will have to be reset at power on - This will take a 
diode, a capacitor and a resistor.  Limiting yourself to 1 uf
capacitors and 1 meg resistors and using a seven stage counter IC,
you should be able to get delays up to 300 seconds.

I don't do schematics for free!

Arnold Frisch
Tektronix Laboratories