Double button light switch circuit (10)

Using the two-button touch switch made of TWH8751 power meter integrated circuit,
the touch panel is "isolated from the AC transformer" and is relatively stable and works very stably and
reliably.
    IWTI87 51 The input pin ① is connected to the positive terminal of the power supply
through the resistor R. This pin ① is in the high power state. At this time, the level change of the strobe pin ② of the integrated block can control the internal voltage When the parent power tube is turned on and off, the CE board of the three-turn tube VT is connected across the ② and ③ pins of the manifold. The change in the equivalent resistance between the ce poles can effectively control the resistance of the ② pin of the manifold. The level island is low. Since the ② pin of the integrated input has extremely high trigger sensitivity, when a human hand touches the M2 "両" electrode piece, the human body senses false clutter current and turns on the = diode wr. Its collector level changes instantaneously. Low, the ② pin of the integrated block is triggered to conduct the Darlington tube inside the integrated block. The ④ pin is low level. The relay K absorbs the platform, and its moving contact kl closes. The lamp F is energized and emits light after the human hand leaves the electrode sheet M2. The integrated block ② Yin is self-locked to the ground through the resistor R, so the relay K remains in the closed state.     When touching the Ml "off" electrode piece with your hand, the human body instantly gives a positive pulse to the integrated block ② foot sampan and the circuit status in the integrated block is reversed. , the ④ pin is cut off, the relay K is released, the contact kl is tripped, and the light F is extinguished. After the human hand leaves the electrode sheet, the ② pin can be connected to high level to keep the shutdown self-locking.     VT should use p≥ 200 type 9 014 brick NpN secondary switch, KⅡ, uses JZC-22F, DC12V small medium power electromagnetic relay. The circuit does not need to be debugged, it can work normally after connecting to the IU. If the connection is long , a shielded wire must be used (the shielded wire mesh is connected to the negative terminal of the 12V power supply ) to prevent interference.