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 oscillator circuit with two transistors is from a 1965 documentation. The circuit is of the...
This circuit was obtained in an old documentation, but it is still current by the used components....
This guitar effect pedal was found in 1982 documentation. The circuit can be easily assembled with...