This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a heat sink. R1 adjusts the load current. The transformer has 1 A of secondary current.
This circuit was found in a 1987 magazine. It generates signals in a range from 100 kHz to 10 MHz,...
This circuit was obtained from an Electronic Design from 1964. Transistors admit modern...
This circuit can generate audio signals at frequencies ranging from 0.01 Hz to approximately 20...