Proportional temperature controller (CB21277E)

This circuit is from an Electronic Design from the 90's. The main integrated circuit is uncommon nowadays.

| Clique na imagem para ampliar |

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...