NE555 Electronic Doorbell Kit
This exciting DIY electronic product enables users to understand the circuit more clearly and learn soldering skills.
$4.99
Out of stock
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This NE555 Electronic Doorbell Kit can make a “ding, dong” sound.
It is composed of a time-based 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. When the button AN (installed on the door) is pressed, the oscillator oscillates at 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.
However, due to AN’s disconnection, the resistor R2 is connected in series to the circuit, causing a change in the oscillation frequency, which is about 500Hz. 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
Specifications: (The Speaker size is random in different batches, not always the same as the picture) |
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| Notes: |
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| Weight | 0.055 kg |
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| Dimensions | 4 × 5 × 1 cm |
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