These are many simple door buzzer circuits, use low voltage so safely.
I fall bored old buzzer. When using the AC line, the danger of leakage power in the heavy rain.
Three Circuits Below can help you! What is more?
Have you ever had a problem with the front doorbell or not?
When used with directly AC line, the danger of leakage power in the heavy rain.
And the doorbell quality is very expensive.
I think we try to make ourselves better, strange sounds are unique. Cheap pieces of equipment. And high performance. Because we have a Choose circuit.
I collected many of the circuits as follows.
# 1: Door buzzer circuit diagram using 555
This is an easy buzzer circuit. It uses IC 555 timer as key, Speaker 25 -80 Ω.
I demolish 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 25-80 Ω size loudspeakers. It will make good sound use force against electricity low work or economize the electricity. You will use 9V batteries all right.
# 2: Door Buzzer circuit using NE555 + LM386
Someday I go to visit a friend. He begs me for helps to seek an electric bell front door circuit. In the model to be simple, use a little equipment.
I then choose the Door Buzzer circuit this give. Because of use, IC NE555 produces electric bell sound and uses IC LM386 to amplify talk at one time. For R1 use fine decorate the sound as you like it. request have fun with 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.
#4: Door buzzer sound circuit using CD4001-CD4060
We like The Door buzzer sound circuit, in two-tone sound. It uses a low voltage, 6V power supply so it is safer than general AC main. We can install the push button outdoor, do not worry about rainy to makes a short circuit. It saves if you use a battery. Because it uses energy only press the push button. See the advantages, do not wait! You can build it.
How it works
When we press the switch-S1. An electric current flows to the circuit. The IC1 will makes two things.
- First, generates a oscillator in high frequency. Which the C1 and R1 set a frequency level.
- Second, it will divide frequency to lower into the tones.
This audio signal from pin 7 and pin 4 into the pin 1 and pin 8 of the IC2a, IC2c respectively.
The IC2b of a frequency converter to control IC2c. When the control signal in during the low state (Low), The 1.25 kHz frequency will come to IC2a.
At the same time, the control signal flows through IC2b to be a high state (High).
The 300 Hz frequency will come to the IC2c. Also, the output at pin 3 of IC2a is low in the same condition.
The output of IC2a and IC2c output is sent to the IC2d. Which it mixes both signal to output to the transistor-Q1.
The Q1 acts as switches and amplifiers. The tones can be heard as two strokes.
The R3 acts as a volume.—You add more value to make the softer sound, but it is lower.
This circuit uses a 6V power supply. You should use a 6V battery or 1.5V x 4 batteries.
How to build this projects
You can build easily circuit. We use the universal PCB board because has a few parts Cause faster for make than general PCB.
The component List
IC1: CD4060, 14 stage ripple counter and oscillator IC
IC2: CD4001, Quad 2-Input NOR(NAND) Buffered B Series Gate
Q1: BC338, 0.5A 50V NPN transistors.
S1: Switch Nomally open pushbutton.
C1: 0.0047uF 50V, Ceramic capacitors.
R1: 47K Resistor
R2: 4.7K Resistor
R3: 2.2K Resistor
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