Capacitor auto-charge-discharge circuit

[ramonegumpert]

Dear Experts,

I am thinking of making a capacitor auto-charge-discharge circuit.

Not sure if this is ok :


Idea :

1. hook-up a voltage comparator to the capacitor receiving charge.
2. the other voltage comparator input pin connects to ground.
3. make the comparator output a signal only when capacitor reaches 5v.
4. when voltage comparator outputs a signal, it triggers a transistor switch that makes the opens the circuit on the wire from the power source to the capacitor +ve connector. So, capacitor will discharge through a short that is turned on when transistor is triggered.

However, I am not very sure how the transistor should be used to open the circuit and close the circuit for discharge.

Please let me know how you think about this method.

Have a great day.

Best regards
Pascal

 

[NascentOxygen]

Hi ramonegumpert. Are you wanting to do this as a construction exercise to learn more about electronics, or do you have a practical need for such a circuit? If so, what is the need to do this, and how large is the capacitance?