Diode Tester (CB22137E)

This diode tester was found in an English publication from the 1980s. Transistors are general-purpose types of the time.

SCR mechanical drive (CB6572E)
This contact or reed switch actuation was found in a 1964 Electronic Design. The circuit can be...
Low Frequency Rectangular Generator (CB1448E)
This circuit was obtained in an American publication of 1977. The circuit generates rectangular...
Wireless FM Microphone (CB11526E)
This excellent wireless microphone circuit for the varicap-modulated FM band came out in...