Precision Heater Control (CB25880E)

Based on a CA3059 zero-cross switch, this circuit was found in the July 1995 Electronics Now magazine. The circuit is not isolated from the mains.

| Clique na imagem para ampliar |

Logic level shifter (CB7254E)
This circuit was found in a 1966 EEE. What it does is it converts the logic levels of 0 V and +4 V...
Operational with Failure Test (CB3951E)
This circuit has been found in operational documentation of the 1970s. The circuit has a fail-safe...
Sound intensity indicator (CB23649E)
This simple circuit does not use active components and uses a small speaker as a microphone. The...