Based on a 555, this 80's American documentation circuit detects the voltage of a battery and can then disconnect the charger. The transistor may be a general purpose type.
This circuit was obtained from an American technical manual from the 80's. The integrated circuit...
Found in a 1980s documentation, this amplifier features high common mode rejection. The operating...
This circuit is from a 1967 RCA documentation. Components can be replaced with modern equivalents. The...