This is a simple touch dimmer circuit made of IC TT6061 . TT 6061 is specifically designed for this purpose.By touching this touch dimmer you can increase the light intensity of incandescent lamps in three steps
At first, when mainsis ‘on,’ the lamp is ‘off’. When you touch theplate, the lamp glows dimly. At second touch, the bulb gives medium light. On the third touch, the bulb is driven fully.Next touch puts off the light off.
Line 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 pulsedepend 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 lamp.
The 6.8V power supply is taken directly from mains through resistors R1 and R3, diode D3, capacitor C4, and zener diode and fed topin 3 of the IC.For the touch plte we can use a 1 sqcm metal plate.
Use exact rating capacitors with the touch plate. Do not touch any other part of circuit other than 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 power rating more than 200 Watts.
Pin Assignments of IC TT6061A.
Pin No.Pin nameFunction description
- CK System clock input
- FI50Hz line frequency
- VDDPower input pin for VDD
- TITouch input
- CISensor control input
- NC Not connected
- VSSPower input pin for VSS
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