Air has pressure because air has mass and weight. In 1945, Life magazine published a four-page spread about air conditioning, entitled "Air Conditioning/ After the War it Will be Cheap Enough to Put in Private Homes." The technology was described as a prewar luxury that was being manufactured in large quantities and sold at a moderate cost in the postwar mass market. Safety: Unlike heavy wall adapters using large iron 50/60 Hz transformers, these have input circuitry running at up to 300 V which must be very well isolated from the low voltage output. Corners may be cut in terms of the amount of insulation in the tiny transformer, physical separation of the high voltage (input) and low voltage (output) circuitry, and build quality. These utilize switchmode technology to chop the rectified and filtered input at high frequency and convert it to low voltage DC. These may be many times that of a high quality unit. Are repairs and high energy bills from your older system costing you money? I bought a bunch of close-out tips for the system and broke them open to see how the pins relate to output. Recently I noticed one of these thingies in K-Mart as part of a modular power system for cell phones.
