Power sources, in particular inverter power sources being inverters, frequency converters, power supplies for plasma cutting machines, welding power sources, namely, welding transformers, inverter power sources, plasma welding power sources; electrical transformers; electronic control systems composed of electronic controllers for handling devices in the nature of machines or robots for welding, namely, a digital TIG (tungsten inert gas) power inverter source for TIG (tungsten inert gas), MIG/MAG (metal inert gas/metal active gas) and MMA (manual metal arc) welding