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This is an interesting project where the intensity of a lamp can be controlled by touch. Having such a built-in feature is available for some expensive lamps. But the same can be achieved without emptying your wallet if you have the know-how of basic electronics. If you have a wall-mounted lamp one easiest way to control its brightness is to use a regulator switch the ones we use for fans.
But if you want to make it more interesting by adding a touch feature check out our project. T his is a simple touch dimmer circuit made of IC TT TT is specifically designed for this purpose. By touching this touch dimmer you can increase the light intensity of incandescent lamps in three steps. When you touch the plate, the lamp glows dimly. At the second touch, the bulb gives medium light. On the third touch, the bulb is driven fully. Next touch puts off the light. L ine frequency is taken through R4 to pin 2 of IC.
At zero crossing the IC fires a pulse to trigger the Triac. The width of this firing pulse depends on the n0: of touches on the plate. Thus by each touch, the firing angle of SCR is varied which in turn varies the brightness of the lamp. Resistors R1 and R3 limit the inrush current. Diode D3 is used for rectification while Zener diode ZD does the job of rectification.
C4 is the filter capacitor. Pin 1 and 2 of the system frequency input pin and input frequency input pin respectively. Pin2 is connected to the mains voltage using a 1. Capacitors C1, C2 and C3 are meant for isolation. Never change their value or replace them with a single one. For the touch plate, we can use a 1 square cm metal plate.
If you are interested in light-based circuit applications, try our super bright led night light and also this mains operated led circuit. Most people love to build an emergency light, and if you like to build one here is our automatic led emergency light. If you still need more lighting circuits, visit our category collection of lighting circuit applications.
Use exact rating capacitors with the touch plate. Do not touch any other part of the circuit other than the touch plate. Ensure that the touch plate is not live, using a tester before using or testing the circuit. Do not use a bulb with a power rating of more than Watts. Do this circuit under your own risk. I have no responsibility for any mishaps. Pin No. This circuit gives you a good idea of handling triacs, IC TT, Zener diodes, and other components.
This is an easy to build circuit and can be used for the school level or entry-level projects. Hello, is it possible to have the effect using 24V operated circuit? Hi, Good Day.. How can we connect this circuit to a same voltage but of 60 Hz Frequency, any circuit modification to make? Thanks in advance. I have been waiting for you.
Excellent circuit. Thanks Best regards! Electronic Circuits Light Related. Author jacky. Edgardo 8 years ago. Murilo 10 years ago. Submit Type above and press Enter to search. Press Esc to cancel.
Touch Dimmer for Lamps
Line frequency signal is taken through R4 at pin TTA. At zero crossing, the triac BT triggers to drive a W bulb. The 6. Pin No. At the third touch, the bulb is driven fully. Another touch puts off the light. Since the IC is highly sensitive, use a long wire to connect the IC to the touch sensor.
TT6061A TOUCH-DIMMER. Datasheet pdf. Equivalent