Let's Make Robots!

Capacitator

Pulsing circuit

Hi everybody. I have an idea for some wierd stuff (I don't want to say what it is untill it works), but I don't know how to make it and I don't know how to google it.

I need a circuit that uses one DC power source, and a capacitator, and it can't have any switches, it has to work all the time the power is conected. It needs to charge the capacitator and when it's full send all the electricity it to the "Parts"/electronics. But "Parts"/electronics shouldnt get any power while capacitator is charging.