Abstract: A dosing system for precisely mixing two liquids in a predetermined volumetric relationship includes a flow meter having a fluid inlet, a fluid outlet, and two intermeshed counter-rotating gears positioned between the inlet and outlet. When a first fluid is directed from the inlet to the outlet, the first fluid causes the gears to turn, and the gears turn a predetermined amount for each unit of first fluid directed through the f low meter. The rotor of a peristaltic pump is coupled to one of the gears of the flow meter, such that for each increment of rotation of the gear, the rotor turns to pump a predetermined amount of a second fluid through the peristaltic pump. The outlets of the two pumps are in fluid communication, to permit mixing of the predetermined amounts of first and second fluid.

Abstract: An AC line filter having a balun coupled to an AC voltage input and an AC voltage output. The balun includes a first and a second set of windings with a first and a second tap on the first and second set of windings, respectively. A first Y capacitor is connected to a ground and the first tap of the first set of windings of the balun, and a second Y capacitor is connected to the ground and a second tap of the second set of windings of the balun.

Abstract: A circuit for automatically operating a switching power supply is capable of operating from first and second input voltage ranges. The circuit changes the switching power supply from a full-wave rectifier circuit to a voltage doubler rectifier circuit by electrically connecting first and second nodes. The circuit includes a rectifier circuit and a voltage level sensing device for generating an output voltage to trigger a triac, which connects the first and second nodes.