Cells and Batteries Test (CB22141E)

This circuit was found in old English documentation. It can be improved by using resistors of different values depending on the batteries tested.

Pocket Receiver (CB23692E)
This simple two-transistor receiver was found in Radio Electronics magazine from September 1960....
Flashing mobile bar with 4017 (CB25434E)
This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4...
500 mW Amplifier TA7117P (CB18897E)
This old integrated amplifier is from a Japanese publication from 1972. The integrated circuit is...