TT6061A and TT8486A sensitive touch light dimmer circuit with explanation

A simple dimmer circuit can be constructed using the CMOS ICs TT8486A and TT6061A, allowing control over the intensity of an incandescent lamp through a touch contact. This electronic touch dimmer can increase the brightness of incandescent lamps in three stages. Initially, when the mains switch is activated, the bulb remains off. Upon the first touch of the touch plate, the bulb illuminates dimly. A second touch results in medium brightness, while a third touch turns the bulb to full brightness. A fourth touch will turn off the light. This sensitive touch dimmer circuit requires minimal external components and can operate on either 110V or 220V AC by modifying certain external components. The touch plate can be a small copper plate measuring 1 cm by 1 cm, a small piece of PCB, or even the end of a lead wire. The touch plate connects to the touch detector through 1000pF, 2kV capacitors C4 and C5, which are arranged in series. The touch signal from IC TT6061A is linked to the counter/decoder through a resistor, while the clock input (CK) connects to the counter/decoder via a frequency generator. The circuit requires a 6.8V power supply, derived directly from the mains through resistors R2, diode D1, capacitor C2, and a zener diode, which feeds into the power input pin 3 of the IC. Capacitors C4 and C5, connected between touch input pin 4 and the touch plate, eliminate shock potential from the touch plate; therefore, these capacitors should not be replaced with a single capacitor or one with a lower voltage rating. The provided circuit diagram is designed for 110V AC. For adaptation to 220V AC, component values must be adjusted: R1 should be changed from 510K to 620K (for 60Hz to 50Hz adjustment), R2 from 20K/1W to 40K/2W (for 110V to 220V), and R6 from 1M to 1.5M (for 110V to 220V). An additional capacitor may also be added in series with C4 and C5, ensuring that it is of the same type and value.

This touch-sensitive dimmer circuit is a practical application of CMOS technology, utilizing the TT8486A and TT6061A integrated circuits to implement a user-friendly lighting control system. The design's simplicity lies in its minimal component count, enhancing reliability and reducing potential points of failure. The touch plate serves as an intuitive interface, enabling users to adjust lighting levels seamlessly without mechanical switches. The inclusion of capacitors C4 and C5 is crucial for ensuring user safety by isolating the high voltage from the touch plate, thus preventing electrical shocks.

The circuit's versatility allows it to be configured for different voltage levels, making it suitable for various applications in residential or commercial settings. The modifications for 220V operation highlight the adaptability of the design, accommodating different electrical standards while maintaining functionality. By adjusting resistor values and ensuring proper ratings for all components, the circuit can be safely and effectively utilized across different voltage systems.

In summary, this touch dimmer circuit exemplifies a blend of simplicity and functionality, making it an excellent choice for those seeking to enhance their lighting control capabilities with minimal complexity. The careful consideration of component ratings and configurations ensures both safety and performance, making this design suitable for a wide range of applications.Using a CMOS IC TT8486A TT6061A you can build a very simple dimmer circuit which can be used to control intensity of an incandescent lamb by simply touch a contact. This electronic touch dimmer circuit can increase the light intensity of incandescent lamps in three steps.

Initially, when mains switch is on, ` the bulb is off`. Now, if you touch th e touch plate, the bulb glows dimly. On second touch, the bulb gives medium light. At the third touch, the bulb is driven fully and another touch puts off the light. This sensitive touch light dimmer circuit uses minimum external components and can be used for 110V or 220V AC by simply changing some external components. For touch plate, you can use a simple copper plate of 1cmG—1cm (a small piece of PCB) or even the end of the lead wire.

Touch plate is coupled to the touch detector through 1000pF, 2kV capacitors C4, C5 connected in series. Internally IC TT6061A`s 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.

This light dimmer circuit require a 6. 8 volts power supply, which is taken directly from mains through resistors R2, diode D1, capacitor C2, and zener diode and fed to power-input pin 3 of the IC. Capacitors C4, C5 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.

Te circuit diagram shown here is just for 110 volts ac, if you want to use this touch sensitivity light dimmer for 220 volts AC, you need to chance some components value. For 220 volts usage you`ll need to change R1 510K TO 620K ( FOR 60HZ CHANGE TO 50HZ ), R2 20K/1W TO 40K/2W ( FOR 110V CHANGE TO 220V ) and R6 1M TO 1.

5M ( FOR 110V CHANGE TO 220V ) and also you can add an additional capacitor in series with the C4 and C5 ( capacitor used must be the same type an value ). 🔗 External reference