The doorbell is powered by a 9 V battery. The circuit is designed to operate without a power switch, as the current consumption when the button is not pressed is very low.
The sound frequencies can be adjusted by changing the values of:
- R2, R3 and C1 - tone when the button is pressed;
- R4 and C2 - tone when the button is released.
Any dynamic loudspeaker with an impedance of 4 to 8 OM can be used.
The printed circuit board dimensions are 46 x 29 mm.
Technical Specifications:
Type: electronic melody doorbell.
Integrated circuit: NE555.
Supply voltage: 9 V DC.
Generated tones: two, depending on button state.
Output: dynamic loudspeaker.
Speaker impedance: 4 - 8 OM.
Idle current consumption: very low.
PCB dimensions: 46 x 29 mm.
This product is a DIY assembly kit.
Electronic Melody Doorbell - HK1034
- Brand: Hobbykit Ltd
- Product Code: 1034
- Availability: In Stock
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2.17 € (4.24 ЛВ.)
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- 3 or more 2.10 € (4.11 ЛВ.)
- 5 or more 2.05 € (4.01 ЛВ.)
- 10 or more 1.90 € (3.72 ЛВ.)
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