Mini solar organ (CB20506E)

This circuit was found in an old documentation and can be powered by a solar panel. The touch resistor is a nichrome wire.

Dip meter with tunnel diode (CB23732E)
This circuit was found in Radio Electronics magazine from April 1961. The device has a slot for...
FET Follower (CB6132E)
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...
Electronic fuse (CB8352E)
Found in a 1968 Motorola manual, this DC circuit uses components from the era. The circuit fires in...