TT6061A中文资料

ELECTRONICS FOR YOU

DECEMBER 2003

TOUCH DIMMER

S .C .

D W I V

E D I K. KRISHNA MURTY

B

y simply touching this touch dim-mer you can increase the light in-tensity of incandescent lamps in three steps. The touch dimmer is built around 8-pin CMOS IC TT8486A/TT6061A specifically manufactured for touch dim-

second touch, the bulb gives medium light.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. The circuit uses minimum exter-nal components. For touch plate, you can use a simple copper plate of 1cm×1cm or

touch signal is connected to the counter/decoder via a resistor and clock input CK is connected to the counter/decoder via a frequency generator.

Line frequency signal is taken through R4 at pin 2 of IC TT6061A. At zero cross-ing, the triac (BT136) triggers to drive a 200W bulb.

The 6.8V power supply is taken di-rectly from mains through resistors R1 and R3, diode D3, capacitor C4, and zener diode and fed to power-input pin 3 of the IC. Capacitors C1, C2, and C3 connected between touch input pin 4 and touch plate

remove the shock potential from the touch plate, so do not replace these capacitors with a single capacitor or with a capacitor of a lower voltage rating. Mains potential exists in the circuit. Needless to say, it is dangerous to touch the circuit when mains is ‘on.’

Note. The IC had been procured by the author from S M S emiconductors,Santacruz (W), Mumbai.

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