Here is the 220V AC lamp touch dimming circuit. Just touch this touch dimmer and you can increase the light intensity of the incandescent lamp in three stages. The touch dimmer is designed around the 8-pin cmosictt8486a/tt6061a and is specially produced for touch dimmer applications.

At first, when the power switch is "on", the light is "off". Now, when you touch the touch pad, the light will emit a weak light. On the second touch, the lamp provides medium light. At the third touch, the bulb is fully energized. Press again and the light will go out.

Considering that the IC is very sensitive, please use a long wire to connect the IC to the touch sensor. This circuit uses a minimum of external components. For the touch pad, a simple copper plate of 1cm-1cm can be used or only the lead end can be used. The touch panel is connected in series to the touch detector through 820pf, 2KV capacitors C1, C2 and C3. The touch signal of the internal ictt6061a is connected to the counter / decoder through a resistor, and the clock input CK is connected to the counter / decoder through a frequency generator.

The line frequency signal is obtained through R4 on pin 2 of ictt6061a. At the zero crossing point, the three terminal bidirectional thyristor switch (BT136) is triggered to drive the 200W lamp.

The 6.8v power supply is directly obtained from the power supply through resistors R1 and R3, diode D3, capacitor C4 and zener diode, and is supplied to the power input pin 3 of the IC. Capacitors C1, C2 and C3 are connected between the touch input pin 4 and the touch panel to take away the shock potential of the touch panel. Therefore, do not replace these capacitors with single capacitors or capacitors with lower rated voltage. The supply voltage is available in the circuit. Needless to say, touch circuits are really high risk when the power is "on".