Matching antenna (CB7458E)

The coil and sockets of this circuit found in a QST depend on the frequency band that is intended to be tuned.

15 V x 200 mA Power Supply (CB25018E)
This simple 15 V power supply was found in an article describing an assembly in the January 1987...
Symmetric Power Supply (CB15712E)
The voltage of this symmetrical power supply depends on the regulating integrated circuits, which...
Light-Operated Lamp (CB23961E)
This circuit appeared in the July 1969 issue of Radio Electronics magazine. The sensor is an LDR....