Abstract: A ring oscillator comprises a first logic block having a first input connected to a specific point along a delay path, a first output and a second output and a second logic block having a first input connected to the first output of the first logic block, a second input connected to the second output of the first logic block, a third input connected to the end of the delay path and a first output connected to the beginning of the delay path. The first logic block is arranged to, in use, alternately switch its first output and second output from logical HIGH to logical LOW, and vice versa, every time a rising edge is input into its first input. The second logic block is arranged to, in use, alternately select its first input and its second input every time a rising edge is input into its third input.

Abstract: A refrigerant assembly includes a refrigerant housing for receiving and containing refrigerant. In one embodiment, the housing has an upper end cap extending over and covering an open upper end of the housing to define a central cavity for the refrigerant. The upper end cap has a bore extending from an inner surface of the end cap to the outer surface. A pick-up tube extends inwardly into the bore from the inner surface of the end cap and is dimensioned so as to be closely received therein. The pick-up tube includes an annular bead toward its outlet end which is received within a counterbore formed coaxial with the bore from the inner surface of the end cap. The counterbore is dimensioned to closely receive the bead on the pick-up tube. The inner surface of the end cap surrounding the counterbore is then mechanically deformed, preferably by staking, around the entire circumference of the pick-up tube such that end cap material is forced radially inward toward the tube.