Voltcraft fixed voltage power supply unit fps 113x series voltcraft fps 1136 the voltcraft fps 1136 is a dc linear fixed voltage power supply unit with electronic stabilisation it is used to supply the power for low voltage devices with a nominal operating voltage of 12v the power supply can be finely adjusted for an output voltage between 11 to 14vthe power supply unit has been constructed in safety class 1 protective insulation and may only be connected to and used on a standard house