No any ic is used in this circuit. This simple and cost effective ding dong electronic doorbell circuit is based on ic 8021 2.
Lz 6079 Electric Bell Relay Circuit Wiring Diagram
Simple doorbell circuit diagram. 15v to 45v dc supply required for operation of this multi tone generator circuit. The working principal of the circuit doorbell is simple. The bell a button mounted at the door and a battery somewhere in between the two. There are two switches s2 and s3 for front and rear door respectively. The bc547 transistor along with the associated preset and the 100uf capacitor form a simple delay off timer circuit where the preset and the capacitor determines the delay for which the sound output may be sustained once the indicated push button is pressed. The diagram above depicts the proposed musical door bell circuit the various stages may be understood with the following explanation.
Simple doorbell circuit diagram and schematic using um 66 ic which is a music sound generator. The ic has an in built circuitry to produce ding dong sound each time its pin 3 is pulled low. As illustrated in the above diagram the parts of an old doorbell circuit include. The battery is the weakest link here and should be the first place to look for trouble. In this case circuit act as a two way doorbell with memory that is the audio alarm indicates whether the visitor is calling from the front door or from back door. This is an easy to make electronic doorbell circuit.
This automatic touch doorbell alarm switch is very sensitive with human finger and this is very simple to construct. The s1 is open the circuit act as a two way doorbell. Connects all components as given in circuit diagram. The sound is stored in the ic as bits as in a rom. Fortunately its likely a simple matter to get things back in working order. At first when power is on to circuit then switch remain off when any touch the touch plate then transistor q1 triggered and as q1 get on the transistor q2 is also turned on.
This is very simple project it requires very less component and then its make it easy and simple but interesting project. The sound output from the ic cant however drive a speaker directly as this puts strain on the device.
Gallery of Simple Doorbell Circuit Diagram
