An ultrasonic cleaning is one of several application of ultrasonic to find its way into industry on a relatively wide scale. Many commercial systems are now available throughout the world. Ultrasonic vibrations are backbone of this module. These are elastic waves at high frequency, which are propagated, in gaseous, liquid or solid medium. The range of ultrasonic waves is above audible frequency 20 KHz. An important feature of ultrasonic waves is that they are directional and energy can be focused on to the density and elasticity of the medium. The principal requirements that apply to generators intended for an ultrasonic cleaning are : The frequency should be stable and smoothly controllable over certain range : - The output should be controllable over a certain range. - The generator output voltage curve should not contain higher harmonics. - The generator should be small, cheap, reliable and easy to operate.