Electronic doorbell how to choose electronic doorbell working principle

With the improvement of people's living standards, electronic doorbells are gradually used to people's lives. At present, electronic doorbells have a wide range of product types and various types. Each product has a unique design. Next, small series explains how to choose and electronic doorbell electronic doorbell works for everyone.

How to choose the electronic doorbell

1, according to performance choices: buzzer-style electronic doorbell pronunciation will be better, cheap, this kind of doorbell sound crisp, long duration of music, but the power consumption is relatively large; while the doorbell is electromagnetic and integrated Circuit type, but there is a good reverberation for the good product.

2, according to the current selection: electronic curtain power can be divided into battery and AC power. The electronic doorbell using the battery consumes more power than the alternating current. It will take a long time for the battery to be replaced. It is rather troublesome. The electronic doorbell of the alternating current can be divided into high voltage and low voltage. Pay attention when using a high-voltage electronic doorbell. Safe, avoid electric shock.

3, according to the quality of choice: quality is the most important, the electronic doorbell to choose a better sensitivity to avoid false triggering when used; electromagnetic touch will use two pieces of metal film sound and reverberation of a longer type.

Electronic doorbell working principle

The electronic doorbell working time base circuit integrated block 555 constitutes an astable multivibrator. When the button is pressed, the oscillator oscillates. The frequency of the oscillation is about 700 Hz and the speaker emits a "bang" sound. At this time, the power supply charges C1 through the diode D1. When you release the button, C1 discharges through resistor R1 and maintains oscillation. However, due to the disconnection of the AN, the resistor R2 is serially connected to the circuit to change the oscillation frequency, which is about 500 Hz. The speaker emits a “buzz” sound until the voltage at C1 cannot be maintained at 555 oscillation. The length of the reverberation of the "pop" sound can be changed by changing the value of C1.

Editor's summary: The selection of the electronic doorbell and the working principle of the electronic doorbell are introduced here. We hope to help everyone. Want to learn more related knowledge can focus on this site information.

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