Abstract: A linear DC power supply provides high efficiency with substantially lower total capacitance than prior art linear DC power supplies. The power supply includes first and second input terminals, first and second output terminals, a center tap transformer, first and second capacitors, first and second charging circuits, and first and second discharging circuits. The center tap transformer has a primary connected to the first and second input terminals and has a secondary with first and second phase terminals and a center tap terminal which is connected to the second output terminal. The first charging circuit is connected to the secondary and the first capacitor to fully charge the first capacitor during a first portion of each cycle. Similarly, the second charging circuit is connected to the secondary for fully charging the second capacitor during a second portion of each cycle.

Abstract: An optical character recognition device including means to define a scanning area which includes portions of a printed character to be scanned by a television camera, said camera scanning discrete points of said area arranged in spaced vertical paths, and including means to measure the optical density of the character portion encountered at each point and to assign a binary-coded numerical value to each point and to store each of said numerical values in a matrix-like fashion corresponding to the respective point's position in said scanning area.