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. Circuit Door Buzzer by 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.
Door buzzer sound with CD4001 CD4060
The Door buzzer sound circuit was two-tone sound. With the switch S1. working of circuit,The IC1 is a frequency dividing circuit, and generator a sound frequency came out.by the C1, R1 are the frequency generator. 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 during the low (Low) 1.25 kHz frequency matches will IC2a.At the same time, the control signal is in a state IC2b high (High), frequency 300 Hz matches will IC2c. Output at pin 3 of low IC2a in the same condition,IC2a and IC2c output is sent to the IC2d.Which acts as both a signal and output to the transistors, 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 sound softer, but smoother, a +6 volt power supply.
Sound bell circuit with ic 8021
This is a simple bell sound generator circuit,Power supply 3Volt, and used on small speakers,and there is less equipment to create simple, well offline.
Operation of the switch S1 is in ON position to a current flowing into pin 5 of IC.To IC1 by IC1 to work with a sound production IC Ting Tong.When we switch S2 will cause the voltage at pin 3 of IC1 is 0 volts, IC1 to function as a result.The output signal from the pin 6 of IC.The signal will be increased by the amplifier Q1 and Q2.This is the audio amplifier. Extending the leg B of the Q1 signal to noise in the speaker SP1.
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.