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Description

Working voltage:DC3V-9V
Product Overview:
This kit is a doorbell circuit that can make a "ding, dong" sound. It is composed of a time base circuit integrated block and peripheral components. It has beautiful and realistic sound quality, simple and easy installation, low cost, and low power consumption. The core IC is the time base circuit integrated block 555, which constitutes an unstable multivibrator. Press the button AN (installed on the door), the oscillator oscillates at a frequency of approximately 700Hz, and the speaker emits a "ding" sound. At the same time, the power supply charges C1 through diode D1. When the button is released, C1 discharges through resistor R1 to maintain oscillation. But due to the disconnection of AN, the resistor R2 is connected in series to the circuit, causing a change in the oscillation frequency, which is about 500Hz, and the speaker emits a "thump" sound. Until the voltage on C1 drops to a level that cannot maintain 555 oscillations. The length of the remaining sound of the "dong" sound can be changed by changing the value of C1

Package Type:
All goods will pack into cartons and wrapped full of waterproof tape before shipment.

We can accept customized package to meet different requirements:
1.Every item will separately pack into plastic bag,component,module can be packed in anti static bag.
2.Some fragile products such as the display screen can be packed in bubble bag.
3.Some large machines can be packed in wooden cases.
4.We can label JH code or client's code on package so that customers can check easily after receive goods.

NE555 Electronic Doorbell Kit

SKU : YXS1269 Brand :

Price : $ 0.27~0.68

100 +: $0.27~0.68500 +: $0.27~0.681000 +: $0.27~0.68

Style：

Processing board
Universal board
Individual PCB board(10pcs)

Quantity :

- +

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