This research was design and built circuits for controls the flow of gas ,which consisting IC 7805 2 A, IC 7815 1 A, IC 7915 1, a capacitor 8, a diode 4 and Transformers 1 phase. by the tack printed circuit pattern on a copper plate. The circuit that can control the flow of gas, according to a Mass flow Controller To test the voltage with a multimeter. Found that the voltage is +5 V, 0 V, +15 V and -15 volts.