So what I'm basically trying to do is have a push-button motor with a solenoid to open when powered but then close and abruptly stop the gears of the motor from turning. The issue right now is that the lower voltage I want to use for the solenoid is enough to keep the arm retracted, but not enough to pull the arm back in the first place. My first idea was to use a capacitor to create a short but powerful flow of current through the solenoid as soon as I turn on the device so that it fully retracts on its own. Would this work?
I have lots of smaller capacitors and my power source is a 3.7v 750ma battery.