These are many simple door buzzer circuits, use low voltage so safe. I am boring old buzzer. When use AC line, danger of leakage power in the heavy rain. Three Circuits Below can help you!..
Have you ever had a problem with the front door bell or not? Are I am boring old buzzer. When used with directly AC line, danger of leakage power in the heavy rain. And doorbell quality is very expensive. I think we try to make yourself better, strange sounds a unique. Cheap equipments. And high performance. Because we have Choose circuit. I collected many of circuit as follows .
1. Door buzzer with 555
This is easy circuit buzzer. It use IC 555, Speaker 25 -80 OHM.
I demolishes a store-room , see old loudspeaker and other equipment a little again. Then born the though builds Door Buzzer by use , IC 555. Perform sound electric bell origin. When press S1 as a result have a voice fair loud. This circuit almost must not do anything. Because divisible Amen! should use 25-80ohm size loudspeakers. will make good sound use force against electricity low work or economize the electricity. You will may use 9V batteries all right sir.
2. Door Buzzer circuit using NE555 + LM386
Someday I goes to visit a friend. He begs me helps to seek electric bell front door circuit. In model to be simple, use the a little equipment. I then choose the Door Buzzer circuit this give. Because of use , IC NE555 produce electric bell sound and use IC LM386 for amplify talk at one time. For R1 use fine decorate the sound as you like it. request have fun this circuit.
3. Simple Electronic Bell Generator using LM741
This is a basic electronic ell circuit, it is interesting. We use a number of IC-741 Op-amp, it works. When you press S1 will be mimic the bell sound at the output pin 6 of IC1, which we can fine tone sound with three potentiometer are VR1-1M, VR2-1M and VR3-1M to control sound as close as possible. We set form of the audio oscillator generator or sine wave form can be changed with by pressing our S1. But sound is slight required to use power amplifier for boost up its. And this circuit need the dual power supply positive, ground, and negative 9V power supply.
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