/diy/ - Do It Yourself

>>1216917
Something like this. The nominal supply voltage range for the IC is 3...15V.
Choose the mosfet according to your output current/load requirements (RL). 2N7000 is ok for small (50mA or so) loads and when using it, you could even omit RG. For larger loads something like IRF540 could be suitable. In that case RG is nice to have, 1k is a suitable value. 2N7000 is ok with 5V supply voltage, but IRF540 requires more.
RS isn't strictly necessary (you can short it), but it makes the timer somewhat more accurate at short delays. D is required only if your load is inductive, like a relay or a motor.
This circuit uses 4541's power-on reset circuit, but you can add an external reset button if you want to. In that case you would pull pin 5 low with a 10k resistor and use a switch to connect it momentarily to V+.
C should be non-polarized, preferably a plastic capacitor.