Abstract: Stamped and formed terminal receptacle for a printed circuit board comprises a hollow tubular receptacle portion, a transition portion, and a mounting portion. The tubular receptacle portion has a lead-receiving upper end and contains a hairpin type spring which extends downwardly from one wall of the receptacle and is reversely bent so that it extends upwardly toward the lead-receiving end. The tip of this spring is formed laterally of the axis of the receptacle to provide an inclined lead-in surface for the lead. The transition portion has features which prevent the flow of solder into the receptacle portion during soldering and the mounting portion has improved means for holding the terminal in the hole on the printed circuit board during handling prior to wave soldering.

Abstract: An eyelet-shaped type connector for connecting together opposite sides of a printed circuit board and having a first end section of a generally cylindrical shape extending out of one side of a hole in a printed circuit board and a second end section of a generally cylindrical shape extending out of the other side of the printed circuit board. A plurality of legs, bowed towards each other, connect the two end sections together. Because the legs are bowed inwardly they will give and become more bowed as the extended first and second ends are soldered to conductive areas around the holes in the printed circuit board and the board contracts after the solder has cooled, thereby eliminating cracking of the solder joints. The inside surfaces of the connector are coated with a soldering repellant material such as chromium and the outside surfaces with a solder attracting coating such as tin.

Abstract: A low profile DIP socket comprising a block-shaped housing with two parallel rows of box-like contact retaining cavities therein and with a rib extending from the inner side wall of each cavity. A DIP lead retaining contact is retained in each cavity and has a generally U-shaped configuration with a first of the two free ended legs having an extension on the free end thereof which is bent back into the channel of said "U" and towards and adjacent to said second leg. A tab is sheared from the bottom of the U-shaped contact and also the first leg thereof to form a slot in said bottom and said first leg thereof and into which said rib fits to orient and stabilize said contact. The tab extends from the closed end of the second leg and through an aperture in the bottom of the cavity in the housing for wire wrapping or other type connection purposes.

Abstract: A thyristor connection which includes a plurality of thyristors each parallel to a voltage divider and a test device for individual testing of the individual thyristors. The test device includes a feeding circuit and a device for measuring the leakage current in one thyristor. The voltage divider for each thyristor is provided with output terminals for connecting the feeding circuit across a part of the voltage divider during measurement. There is a measuring section in series with such part of the voltage divider for connection of the measurement device. The thyristor connection is provided with an outer voltage divider in parallel with the connection which is provided with an output for connection of a point of the voltage divider to a pole of the feeding circuit.

Abstract: An energy source for large heating systems, such as municipal systems, is disclosed which includes a heat pump driven directly by an internal combustion engine. The exhaust gases from the engine are passed through a heat exchanger to provide additional heat input to hot water leaving the condenser of the heat pump. In one embodiment, the exhaust gases also provide heat input to the evaporator of a second heat pump unit also driven directly by the internal combustion engine.