The difference between touch switch and voice control switch IC and the wiring methods and steps

We often use voice-activated switches in our lives, especially in lighting environments such as stairwells, corridors, public toilets, etc., where voice-activated switches ic are used. This kind of switch is closed during the day. Only at night, it can automatically turn on as long as there is a slight sound, and then automatically turn off after a delay of 45 seconds. It is convenient to use and saves power. He is able to avoid long periods of illumination and react quickly to short bursts of sound. This article mainly describes the wiring method of voice-activated switch ic and the difference between touch switch and voice-activated switch ic.

Voice control switch ic wiring method

The contacts are reliable and the operation is flexible.

The wire insulation resistance test is qualified and there are insulation resistance test records.

Sound control switch IC installation and wiring steps

Removal of the original switch: Remove the original switch and accessories. Before disassembly, you should carefully observe its installation and wiring conditions to avoid damage to the switch caused by blind disassembly.

Cleaning:

(1) Use a brush to remove the debris in the junction box and clean the debris on the wires.

(2) If the inner surface of the metal junction box is rusted, it should be removed and painted with anti-rust paint in time, and the debris in the box should be cleaned up.

The difference between touch switch and voice control switch IC

Touch delay switch

When using the touch delay switch, just touch the touch electrode with your finger, the light will light up, and it will automatically go out after a delay of about 1 minute. It can directly replace ordinary switches without changing indoor wiring.

The right side of the dotted line of the touch delay switch circuit is the ordinary lighting circuit, and the left side is the electronic switch part. VD1~VD4 and VS form the main circuit of the switch, and IC forms the switch control circuit. Normally, VS is in the off state and the light does not light up. VD1~VD4 output 220V pulsating DC power, which is current limited by R5, stabilized by VD5, and filtered by C2 to output about 12V DC power for IC use. At this time, the LED lights up to indicate the switch position, making it easier to find the switch at night.

The IC is a double D flip-flop. Only one of the D flip-flops is used to connect it to a monostable circuit. In the steady state, pin 1 outputs low level and VS is turned off. When a human hand touches electrode M, the human body leakage current is divided by R1 and R2, and its positive half cycle causes the monostable circuit to flip. Pin 1 outputs a high level, which is added to the gate of VS through R4, turning on VS and turning on the light. Bright. At this time, pin 1 outputs a high level to charge capacitor C1 through R3, causing the level of pin 4 to gradually increase until the transient ends. The circuit returns to the steady state, pin 1 suddenly changes to low level, VS loses the trigger voltage, and the AC crosses zero. When it is turned off, the light goes out.

voice control switch ic

There is a microphone, photoresistor, transistor, capacitor and other electronic components in the voice-activated switch. During the day, the resistance of the photoresistor is small. This will block the microphone signal input. This way even if there is a loud sound. However, due to the pull-down of the photoresistor, the signal cannot continue to be transmitted, so it does not light up during the day.

At night, the resistance of the photoresistor becomes larger. If there is a loud sound at this time. Sound is converted into electrical signals through a microphone. The subsequent amplifier circuit then amplifies this small signal. Finally, push the thyristor to conduct, and the light bulb will light up. There is a resistor-capacitor discharge circuit in the thyristor drive circuit. This circuit is a delay circuit. The size of the capacitor value and the size of the resistor value will affect the change of the delay amount. When the charge in the capacitor is exhausted, the thyristor will automatically turn off after the AC crosses zero, and the light bulb will go out.

Through the content of the article, we can learn about the wiring method of voice-activated switch ic, and the difference between touch switch and voice-activated switch ic. In fact, comparing the two, if it is a place like a stairwell where you will not stay for a long time, it is really best to use a voice-activated switch IC. When it gets dark, it starts up according to the sound, and goes out within the specified time after the sound disappears. However, it is not suitable to install a voice-activated switch IC at home or somewhere where you need to stay for a long time. In this case, a touch switch must be installed.