COMPACT SYN power sources represent an evolution towards the simplification process of the welding operations by allowing, in a user friendly way, also non expert users to very easily adjust the welding parameters. Equipped with an innovative synergic microprocessor, based on the most modern digital technology, this series of machines has got several pre-set welding programs which, depending on used material, gas and wire diameter, will automatically select the best parameters according to the preset welding voltage. The synergic function may be easily excluded by changing the way of setting of the welding parameters like in traditional MIG's. Depending on used material thickness, an easy-to-read table shows in which position to set both commutator switches to automatically obtain the best welding result. Technologically advanced, robust and easy-to-use, the COMPACT SYN power sources provide the additional synergic feature on top of the excellent characteristics of the COMPACT machines.