Discharging a capacitor at a steady current means that it’s voltage will drop steadily. A steady voltage change is called a ramp.
Video below shows how to build this circuit on a breadboard.
Updated diagram and video:
- One farad (1F) super capacitors will change their voltage by 1 volt each second that one amp of current flows. Those are very large values for most capacitors, and therefore it is usually a fractional amount. For example, a 0.001F (1,000µF) capacitor with 0.001A (1mA) of current flowing, will also change voltage at a rate of 1V per second.
- Brief fixed resistor voltage divider circuit
- Brief trimmer potentiometer trimpot variable resistor voltage divider circuit fragment
- Brief 555 bistable mode flip flop alternating LEDs circuit
- Brief 555 timer monostable one shot mode circuit
- Brief 555 timer astable multivibrator mode circuit
- Brief polarity indicator LEDs circuit
- Brief capacitor charge and discharge through LEDs circuit
- Brief capacitor charging RC time constant demonstration circuit
- Brief capacitor discharge RC time constant circuit
- Brief charging capacitor voltage ramp circuit using LM334 current source
- Information on this site is not guaranteed to be accurate. Always consult the manufacturer info/datasheet of parts you use. Research the proper safety precautions for everything you do.