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A breadboard (solderless breadboard, plugboard) is a reusable solderless device used to build a (generally temporary) prototype of an electronic circuit and for experimenting with circuit designs. This is in contrast to stripboard (veroboard) and similar prototyping printed circuit boards, which are used to build more permanent prototypes or one-offs, and cannot easily be reused. A variety of electronic systems may be prototyped by using breadboards, from small circuits to complete central processing units (CPUs). The term breadboard is derived from an early form of point-to-point construction; and in particular the practice of constructing simple demonstration circuits (usually using valves/tubes) on a convenient wooden base, (similar to a cutting board). Over time, breadboards have evolved greatly, with the term being used for all kinds of prototype electronic devices. For example US Patent 3,145,483 [1], filed in 1961, granted in 1964, describes a wooden plate breadboard with mounted springs and other facilities. Six years later, US Patent 3,496,419[2], filed in 1967 and granted in 1970, refers to a particular printed circuit board layout as a Printed Circuit Breadboard. Both examples also refer to and describe other types of breadboards as prior art. The classic plastic pluggable breadboard, illustrated in this article, was designed by Ronald J Portugal of EI Instruments Inc. in 1971[3]
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