Simple Calling Bell Circuit Diagram. The image below shows the internal mechanism of an electric bell. The circuit basically comprises three stages viz.
This circuit uses fsr force sensing resistor as an activator instead of a button and this provides the touch activation feature. The image below shows the internal mechanism of an electric bell. Wiring for two doors is the same as for one with the transformer hardwired to the 120 volt source from a house circuit.
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.
We will be constructing a simple wireless calling bell using arduino and nrf24l01 2 4 ghz module which can work around your home or your office without any hiccups or coverage issue. 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 momentarily. The electric circuit is completed by installing a push switch which you can press to generate sound in an electric bell. Wiring diagram for a two chime doorbell.
