This battery circuit provides a charging current of 500 mA depending on the solar panel. The switching circuit is from a National Semiconductor documentation from the 90s.
We find this circuit in a Radio Electronics of July 1984. It consists of the traditional version of 1 A...
A more efficient filter is the one that diverts the signal to the ground and not only short it, as...
This circuit with different colored indicator LEDs has an expanded scale. We found it in the March...