Push the button and the solenoid actuates and holds for a time, then turns off atomaticly.

Time Delay 555 Solenoid

Push the button and the solenoid actuates and holds for a time, then turns off atomaticly. Adjust the time delay with the potenciometer. Replace the solenoid with a motor if you want. You can use a different capacitor for C1 to change the maximum on time. S1 is used to activate the timing cycle. S1 can be replaced by a NPN transistor so that the circuit may be triggered by a computer, other circuit, etc.