I am looking to power a circuit using a 5.5V, 5F supercapacitor. I want to charge it to approx. 5V but I don't want it to discharge into my circuit until it has charged to 5V. I can do this by simply using a switch or disconnecting/connecting the appropriate wires of the switch, but I want to control this automatically. Is there any way to do this? Thank you for your help!
Edit 12/8/18: I built the following circuit, kindly suggested by user Transistor. For my SCR, I am using a NTE5402 and for the Zener diode I am using a 4.7V 1N4732A. The resister is 1k ohm and the circuit is a simple buck booster (Adafruit Powerboost 1000) connected to an Arduino.