Power driver and fail safe circuit (10, 10', 10", 10"') for a gas valve in order to open or close the gas valve in such a way that the gas valve is opened when a coil of the gas valve being connectable to output contacts (13, 14) of the power driver and fail safe circuit (10, 10', 10", 10"') is energized with a defined, fully controlled DC output power level of the power driver and fail safe circuit and that the gas valve is closed when said coil of the gas valve is not energized with the defined DC output power level of the power driver and fail safe circuit, comprising: input contacts (11, 12) to which a power source providing a defined DC input power level for the circuit is connectable; an inductance coil, a transistor and a resistor being connected in series to each other in such a way that said inductance coil is connected to the drain of the transistor and that said resistor is connected to the source of the transistor; an input capacitor being connected in parallel to the series connection of said inductance coil, said transistor and said resistor; an output capacitor being connected between the output contacts (13, 14) to which the coil of the gas valve being connectable; a first diode being connected in series to the parallel connection of the output capacitor and the coil of the gas valve; wherein said series connection is connected in parallel to said inductance coil, wherein the anode of said first diode is connected to said inductance coil and to the drain of the transistor, and the cathode of said first diode is connected to the output capacitor and to a first output contact; a micro controller and a peak current detector both being connected to the gate of said transistor so that the transistor can be turned on into a current conducting mode by a signal provided by the micro controller and that the transistor can be turned off into a current blocking mode by a signal provided by the peak current detector; a fuse connected to said inductance coil, wherein a second diode is connected in series to that fuse, whereby the anode of said diode is connected to first input contact, and whereby the cathode of said diode is connected to the fuse. input contacts (11, 12) to which a power source providing a defined DC input power level for the circuit is connectable; an inductance coil, a transistor and a resistor being connected in series to each other in such a way that said inductance coil is connected to the drain of the transistor and that said resistor is connected to the source of the transistor; an input capacitor being connected in parallel to the series connection of said inductance coil, said transistor and said resistor; an output capacitor being connected between the output contacts (13, 14) to which the coil of the gas valve being connectable; a first diode being connected in series to the parallel connection of the output capacitor and the coil of the gas valve; wherein said series connection is connected in parallel to said inductance coil, wherein the anode of said first diode is connected to said inductance coil and to the drain of the transistor, and the cathode of said first diode is connected to the output capacitor and to a first output contact; a micro controller and a peak current detector both being connected to the gate of said transistor so that the transistor can be turned on into a current conducting mode by a signal provided by the micro controller and that the transistor can be turned off into a current blocking mode by a signal provided by the peak current detector; a fuse connected to said inductance coil, wherein a second diode is connected in series to that fuse, whereby the anode of said diode is connected to first input contact, and whereby the cathode of said diode is connected to the fuse.