Electromechanical Counter (CB21682E)

This photoelectric circuit from a 1960 publication uses a 6.3 V electromechanical counter, common at the time.

VHF TV Signal Generator (CB511)
This circuit produces a signal in the range corresponding the the VHH channels between 2 and 6....
2 Transistor Intercom (CB13991E)
The circuit presented is from a 1969 Radiorama magazine (Italy), and can be designed with more...
Triac Power Switch (CB25074E)
The maximum power of the controlled load depends on the triac used. The circuit is from a Radio...