Inverters are power generating devices that are able to convert DC battery potential to mains equivalent AC. These are personal power generators that can be used during mains power failure or during outings like picnics and camping. Basically an inverter consists of three stages viz: DC Source, oscillator circuit, and power transformer output stage. An inverter may be classified into a square wave design and a sine wave design.
Square wave inverters are very basic types involving a square wave oscillator stage which directly translates the DC low potential square wave oscillations into high voltage AC. These are never recommended for operating sophisticated electronic appliances like TVs, music systems, computers etc.
Sine wave inverters are more complicated in design but the output from these inverters become ideally suitable for operating the above appliances. However making a sine inverter is not easy, the main disadvantage being the exponentially altering waveform which result in a lot of heating of the output devices and wasting a lot of power in the form of heat. The present design of a simple sine wave inverter circuit is no exception and though it is equipped with the advantages of a sine wave, it definitely is not very power efficient. However keeping the huge advantage in mind that a sine wave inverter can deliver compared to the square wave designs, the power inefficiency factor quite becomes a trivial issue. The diagram of this sine wave inverter presented here is very simple to make and can be assembled by anybody having basic knowledge of electronics and soldering.