This is the simplest ever musical calling bell that can be easily built. It uses themusical 3 pin IC UM66 and a popularly known Transistor BC548b. The circuitcan be made even without soldering and the ideal for the first electronic projectfor newbies. Here the musical IC UM66 generates the music when it receivessupply and drives a small speaker through a class c amplifier using silicontransistor BC548b.