Road construction machine particularly a road finisher or road finisher feeder

A road finisher or a feeder for a road finisher with a primary drive unit, comprising

• at least one electrical heating apparatus operable with alternating voltage with varying frequency,
• a combustion engine driving at least one three-phase generator for supplying the at least one electrical heating apparatus with alternating voltage with varying frequency, and
• at least one connection means for at least one conventional alternating current consumer,
• a stabilized voltage supply unit having at least one universal conversion circuit including a bridge rectifier or an intermediate circuit containing a controlled power supply, respectively for first generating an intermediate voltage and secondly generating a standard mains voltage with a permanently stable frequency from the intermediate voltage, the stabilized voltage supply unit being connected between the connection means and the three-phase generator to provide the standard mains voltage at the connection means which is connected via a connection line to the universal conversion circuit, the voltage supply unit being connected directly to the three-phase generator or to a securing system or a secured supply line of the at least one electrical heating apparatus.