Capacitor voltage changes steadily when provided a steady current. This creates a straight line if you look at the voltage change on an oscilloscope. A steady voltage change is called a ramp.
Video below shows how I put this circuit together on a breadboard.
- One farad (1F) capacitors will change their voltage by 1 volt each second that one amp of current flows. Those are very large values, so usually it is 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.
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Updated video and diagram:
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- 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.