Electronic circuit for supplying a transmitting coil

The circuit has an output terminal and an input terminal (1) at which a supply voltage is applied by a battery of a vehicle. A supply circuit is connected to ground. A voltage transformer is connected between an input terminal (Se) of the transformer and the ground, where an input voltage of the transformer is adjusted to compensate dispersions of an antenna. An independent claim is also included for a motor vehicle comprising a hands free access system with an electronic circuit.