In this simulation, there is no solar panel and battery ( to charge ) in the library of components, so i decided to replace those with DC voltage source and LED respectively. The push button and potentiometer which connected to pin 2 of 555 timer, was to manually switch the circuit into charging mode, and set the minimum charging voltage. The push button and potentiometer which connected to pin 6 of 555 timer, was to manually switch the circuit into dumping mode, and set the maximum charging voltage.
This circuit was set to be in charging mode, if the voltage from solar panel is between 12V and 14.9V. upper or lower than the range, the circuit will be in dumping mode.
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