Photo FET trigger (CB8329E)

The photo FET is not a common component today. In this 1964 Electronic Design application we have a light switch circuit.

| Clique na imagem para ampliar |

Biestable Touch Switch (CB10246E)
This circuit is from an English magazine of 1977. The circuit is still current, just using BC547...
Battery Charger (CB16778E)
The adjustment of the maximum load voltage is made in the trimpot. The circuit is from 1994...
Differential Amplifier (CIR18634E)
In the figure we have the conventional configuration of a differential amplifier with the...