The inverter circuit shown in the figure provides a voltage of around 110 V with a rectangular waveform with slight distortion that, in a way, brings it closer to a sinusoidal form and a frequency of around 60 Hz. The power is around 20 W, depending on the efficiency of the transformer used, which makes the circuit interesting for powering devices that are not sensitive to the input waveform, such as shavers, incandescent lamps, etc. The power transistors must be equipped with heat sinks. The transformer has a secondary of 12 V + 12 V with a current of 3 A. Transformers with lower currents can be used, but we will have a lower output power as well. The TTL oscillator integrated circuit must be powered with 5 V, a voltage that is provided by a 7805 regulator. Since only one IC is powered, it will not be necessary to use a heat sink in the regulator. The paths traveled by the most intense currents must be wider. The 2N3055 power transistors must be mounted on good heat sinks, preferably on the outside of the box that will house the set.
