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Jetek-Pcb Co.,Limited is one of the leading China power supply pcb manufacturers and suppliers,Website:http://www.jetekpcb.com, welcome to wholesale power supply pcb from our factory.product namePower supply PCB?Product SpecificationsFR-4 1.6MM 1OZGreen solder mask/White silkscreen, HASL?product descriptionBoard material: FR-4 TG≥130Board thickness: 1.6mmPCB Layers: 4 layersCopper thickness: 1ozSurface finishing: HASLSolder mask: GREENSilk screen: WHITEMin line width: 0.10mmMin line spacing: 0.10mmMin hole size: 0.20Impedance control: YesBuried and blind holes: NoSpecial process: No?* All products approved by ISO9001/TS16949 and UL certificate* High quality products on Easy & safely way* Quick turn & Reasonable price & excellent quality & Professional service* Paypal payment for secure client& acute;s funds* 100% open/shorted testing???Product TipsPCB History 2Before printed circuits (and for a while after their invention), point-to-point construction was used. For prototypes, or small production runs, wire wrap or turret board can be more efficient. Predating the printed circuit invention, and similar in spirit, was John Sargrove& acute;s 1936–1947 Electronic Circuit Making Equipment (ECME) which sprayed metal onto a Bakelite plastic board. The ECME could produce 3 radios per minute.During World War II, the development of the anti-aircraft proximity fuse required an electronic circuit that could withstand being fired from a gun, and could be produced in quantity. The Centralab Division of Globe Union submitted a proposal which met the requirements: a ceramic plate would be screenprinted with metallic paint for conductors and carbon material for resistors, with ceramic disc capacitors and subminiature vacuum tubes soldered in place.[42] The technique proved viable, and the resulting patent on the process, which was classified by the U.S. Army, was assigned to Globe Union. It was not until 1984 that the Institute of Electrical and Electronics Engineers (IEEE) awarded Mr. Harry W.