Found in a 1947 publication, this circuit uses 4 parallel/push-pull tuber in the output stage. The circuit employs dual power supply with two rectifier tubes.
This circuit was found in National Semiconductor documentation from the 90s. The circuit uses two...
We found this circuit in the March 1984 issue of Radio Electronics magazine. The module used is a...
This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The...