Sensitive triac controller (CB7864E)

This circuit, which can be used as a shield, was found in a 90s Electronic Design. The circuit uses a diac and the transistor can be general-purpose.

| Clique na imagem para ampliar |

Digital volume indicator (CB7008E)
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...
Ohmmeter (CB19751E)
This resistance meter has a linear scale, converting resistances to voltage. The operational...
Over-temperature alarm (CB10485E)
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...