Darkness Monitor (CB21019E)

Found in Popular Electronics this circuit triggers an SCR and lights an LED when the location of the sensor is dark.

| Clique na imagem para ampliar |

Distribution Amplifier (CB19012E)
This amplifier for distributing audio signals appears in other articles on this website and even...
MOSFET Parameter Meter (CB21398E)
This circuit was found in a 1964 MOSFET applications manual. The circuit uses period general...
Time Light (CB18745E)
This circuit works only with incandescent lamps, timing its activation at intervals that depend on C1....