The doorbell English is Doorbell, that is, the bell on the door, which can make a sound remind the owner to visit.The more common doorbells now include ordinary wireless doorbells, wireless doorbells without batteries, and wired doorbells.
Doorbell production
A simple method is: button processing, when there is a button, the PWM signal is output with a single chip machine, and then enlarged with audio such as 386 and the output to the speaker.If you want a good bell, you can use a special music chip to replace the PWM signal.
Doorbell installation
In general, the installation method of wireless doorbells is generally far from the wireless doorbell, some can reach about 300 meters, and the price is not too high.? First of all, the horn should be placed indoors, then the power is inserted, and then the plastic sheet of the insulator needs to be pulled out. Secondly, the button of the wireless doorbell is placed at your doorstep, fix it with double -sided or screws, and then the battery is fixed.Put it in, and finally pay attention to the selection of keys must be able to avoid rain. Although the wireless doorbells are mostly avoided now, they must be preventive in case.The installation of wireless doorbell installation of wireless doorbell is similar to the installation method of wireless doorbell, but it only has some details, that is, when installing wireless doorbells, you need to install another battery.
Doorbell circuit
The main components of the doorbell circuit are: several main roots, passive beeurges, sockets of bee tweets, universal plates, triode, diode, resistance, potentiometer, electrolytic capacitors, keys, IC seats, and acupuncture points.Of course, it will also increase or reduce related equipment because of the different forms of the doorbell designed.
Doorbell price
Communicate long -distance remote -control radio doorbells. The transmitter does not need a wire. One button+one receiver, the market price is 45.00 yuan; one button+two receiver, the market price is 76.00 yuan.Augnnalbell, a doorbell with a battery without a battery, a long -distance remote control of the house, one button+three receiver, the market price is 156.00 yuan.Augner wireless doorbell, wireless long -distance remote control, white optional, one button+two receiver, the market price is 117.00 yuan; one button+one receiver, the market price is 78.00 yuan.
Doorbell brand
1. Ying Runjia 2, Youka III, Heideman Four, Qiaohua

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