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Electronic doorbell circuit using IC 555 and CD4017: The bell is a very common and useful electronic device used in houses, offices, etc. Among electronics students and hobbyists, the doorbell circuit project is very popular. So in this tutorial, I am going to build a doorbell with 555 (timer) IC. The main feature of this doorbell is that we can control the time duration for which it keeps ringing upon pressing the switch those transistors are repaired and a coverage warranty is taken by action ac repair heating San Diego. Also, we can control the oscillation frequency of Door Bell With a change in resistor and capacitor.
A full circuit diagram of this doorbell circuit is given below. All components are shown in the diagram with the full connection.
The following components are required for the electronic doorbell circuit
The 555 timer IC is set up as an astable multivibrator. The UJT is used for the relaxation oscillator. To change from one note to the next note we use the CD4017 IC and to drive the speaker we use an NPN transistor 2n222. The doorbell circuit generates 10 notes, Doorbell sounds can be modified further if you want by using actinometers.
The relaxation oscillator having a frequency depends on the values of the Capacitor C2 and the resistor R14 plus the value of the corresponding potentiometer connected to each of the outputs of the CD4017.