This circuit was found in a 1967 RCA documentation. The components are of the time. The circuit limits the current to 50 mA when the battery is fully charged.
A passive mixer with few components is that of the circuit shown, found in a 1982 documentation. As readers...
This circuit produces a pulsating intermittent sound in frequency that can be adjusted in P1. The...
This circuit was found in an Elektor from the 90s. The circuit uses common components even today,...