Capacitors have a steady voltage change when they are being charged/discharged by a steady current. A 1000µF capacitor will change 1V per second @ 1mA. The voltage change looks like a ramp on an oscilloscope.
Video below shows how I put this circuit together on a breadboard.
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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.