Summary: Set up a circuit for charging and discharging a capacitor. Use corresponding resistors to control the charging/discharging time. Monitor the voltage change with a oscilloscope and determine if the actual charge/discharge time is close to the desire value.
Schematic.
Source voltage=10V, charging interval is 20s, discharging interval is 2s. The energy stored is 2.5mJ. Time constant is 1/5 of time interval. Calculate the proper resistance and capacitance, verify if the values meet actual components' power restriction.
Voltage change curve caught by oscilloscope. Final voltage after charging is 9.24V. Both charging and discharging interval are close to designed value.
Charging
Discharging
Consider the leak resistance of the capacitor. Compare the observed result with the calculated result.
Notes: The overall process meet the designed expectation; however, the Thevenin resistance has great difference. Maybe the graph of voltages-time is not very accurate.
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