Privacy policy and cookies - INCBTech uses cookies and similar technologies to help deliver the best experience on our site. Our cookies are necessary for the operation of the website, monitoring site performance and to deliver relevant content. You can visit our Privacy Centre to learn more about your online settings.


Time Light (ART494E)

Keep the lamp on for a fixed time after S1 is pressed. Do not use with another type of lamp. The circuit can operate on both 110 V and 220 V mains with lamps up to 100 W. The circuit is half-wave, ie the lamp lights up with half the normal brightness.

In figure 1 we have the complete circuit of the time light. The maximum interval is of the order of a few minutes and depends on C1.






• Lighting of hallway lights and elevator halls

• Timed activation of various loads such as fans and heating elements.

• Timing of industrial automations where high accuracy is not required.


Constructive Details:

The printed circuit board for mounting the time light is shown in figure 2.


Figure 2
Figure 2



The capacitor C1 is a high voltage electrolytic, for 200 V if the grid is 110 V and 400 V if the grid is 220 V. The SCR must be mounted on a heat radiator. The values in parentheses are for the 220 V network.

The load must be resistive and the control is half wave.



SCR - TIC106B or D - SCR for 110 V or 220 V according to the local network

D1 - 1N4004 (110 V) or 1N4007 (220 V) - silicon diode


Resistors: (1/8 W, 5%)

R1 - 100k ohm

R2 - 47 k ohm



C1 - 2 uF at 16 uF x 200 or 400 V - high voltage electrolytic - see text



X1 - incandescent lamp up to 100 W

Printed circuit board, heat radiator for SCR, wires, solder, etc.