What do you think of this circuit to activate a solenoid? Does it need anything else? See attached.
Hopefully I calculated this correctly. I didn't factor in the diode (not sure how to), but calculated the capacitor and resistors. When you flip the switch it should initially give it a pull-in voltage of 20V for about 1.5 seconds and then hold the voltage at 8.5V until the switch is turned off.
Do I need a circuit to discharge the cap? Do I need any protection added? Any advice would be great.
Thanks!
Hopefully I calculated this correctly. I didn't factor in the diode (not sure how to), but calculated the capacitor and resistors. When you flip the switch it should initially give it a pull-in voltage of 20V for about 1.5 seconds and then hold the voltage at 8.5V until the switch is turned off.
Do I need a circuit to discharge the cap? Do I need any protection added? Any advice would be great.
Thanks!