Wire wrap
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Wire wrap is an electronic component assembly technique that was invented to wire telephone crossbar switches, and later adapted to construct electronic circuit boards. Electronic components mounted o
Close-up of wire-wrap connections
Typical wire wrap construction of Bell System telephone crossbar switch. Some types of connection were soldered.
Wire wrapped backplane of an IBM 1401 computer, introduced in 1959
A modern wire wrap in a CFL
Printed circuit board
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A printed circuit board, also known as a printed wiring board, is a laminated sandwich structure of conductive and insulating layers, each with a pattern of traces, planes and other features etched fr
Printed circuit board of a DVD player
Part of a 1984 Sinclair ZX Spectrum computer board, a printed circuit board, showing the conductive traces, the through-hole paths to the other surface, vias connecting traces on both sides, and some electronic components mounted using through-hole mounting
Proximity fuze Mark 53 production line 1944
Through-hole (leaded) resistors on a paper tape. When mounted to a PCB, the resistors are removed from the tape and their leads are trimmed to required length.