This circuit was fond in an old publication of the years 1950. The transistors are germanium types and equalization is RIAA.
This battery circuit provides a charging current of 500 mA depending on the solar panel. The...
This circuit measures millivolt voltages. The corresponding current range of the multimeter can be...
This is a very useful autotransformer circuit on the bench. We found it in the September 1970...