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.
This telegraphy circuit generates an audio tone from a pure RF carrier. We found it in a...
Found in Popular Electronics from the 90's, this circuit uses 555 integrated and common...
This circuit was obtained in a 1982 English magazine. It is a regulator for outputs between 1 and...