A spring, especially for use in a belt tensioning device, with a number of at least 1. In one embodiment, the method of forming the integrated circuit includes forming a power switch of a power train of the power converter on a semiconductor substrate, and forming a driver switch of a driver configured to provide a drive signal to the power switch and embodied in a transistor. The chair further comprises a seat bottom, the seat bottom comprising: a seat bottom frame; a sinuous spring base coupled to the seat bottom frame; a plurality of coil springs coupled to the sinuous spring base; and a second gel infused foam layer coupled to the coil springs. The duration of application of the magnetic field is controlled to achieve a joining temperature that is approximately halfway between the storage and operating temperatures of the integrated circuit chip. The database of events is filtered to produce a set of events comprising those events that match the set of criteria.