SCHEMATIC WIRELESS DOORBELL

Wireless controlled Door-bell – Electronics Project
Circuit Description. As the wireless doorbell is wireless based project, it is divided into two major section i.e. transmitter and receiver. Transmitter:-This transmitter section is designed around oscillator transistor (BF194B) T 2 followed by two transistor (BC148) T 1 and T 3.
Circuit Project: Wireless Doorbell | EEWeb Community
The doorbell operates on the 303MHz band and the 30 metre range (100ft) is obtained without the use of an antenna! The circuit is actually radiating from the printed track of the tank circuit. The Tank Circuit is a single-turn coil and a small capacitor (5p & 4p in parallel).Author: Extreme Circuits