Light switch delay circuit

Details Light switch delay circuit Light switch delay circuit

1980-06-16

1982-07-13

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Time-controlled

307141, 315199, 315362, 361196, H05B 3900

Patent

active

043396968

ABSTRACT:
A delay circuit comprising two leads adapted to be connected across a light switch for delaying the turn off of a light bulb after the switch has been turned off. A silicon controlled rectifier (SCR) is connected across the two leads for applying power to the bulb when the SCR is on. A capacitor is connected to one of the leads for controlling circuitry coupled to the gate of the SCR for turning the SCR on for a given time period following the opening of the switch. A quick discharge circuit is provided for rapidly discharging the capacitor when the switch is closed.

REFERENCES:
patent: 3732484 (1973-05-01), McKenna

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