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Dark-activated 230V Lamp circuit (TIC106D)

2016-08-04 15:59  
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This article describes the Dark-activated 230V Lamp circuit (TIC106D). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:TIC106D.

Compact circuitry using small-size parts only

Circuit diagram:

Dark-activated Lamp


R1_____________Photo resistor (any type)
R2____________100K     1W Resistor
R3____________200K   1/2W Trimmer Cermet
R4,R7_________470R   1/4W Resistors
R5_____________12K   1/4W Resistor
R6______________1K   1/4W Resistor

C1_____________10nF   63V Polyester Capacitor

D1_________TIC106D   400V 5A SCR
D2-D5_______1N4007  1000V 1A Diodes

Q1___________BC327    45V 800mA PNP Transistor
Q2___________BC337    45V 800mA NPN Transistor

SK1__________Female Mains socket

PL1__________Male Mains plug & cable

This device allows one or more lamps to illuminate at sunset and turn off at dawn.
Q1 and Q2 form a trigger device for the SCR, providing short pulses at 100Hz frequency. Pulse duration is set by R2 and C1.
When the light hits R1, the photo resistor assumes a very low resistance value, almost shorting C1 and preventing circuit operation. When R1 is in the dark, its resistance value becomes very high thus enabling circuit operation.


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