Split Coil Wiring Diagram - Product Details. Want single coil tones from a humbucker-size pickup? You got it! Our single coil for humbucker offers P-90 tonality with a little less mid-range and a more open sound.. Reciprocating compressors are driven by a motor and use pistons, cylinders and valves to compress the refrigerant. Reciprocating compressors are usually used in smaller systems up to 100 tons and are available in hermetic, semi-hermetic or externally driven versions..