Printing electronic circuits

A new method of printing wiring and circuit components on an insulated surface, developed by the National Bureau of Standards in co-operation with electronic manufacturers for the tiny generator-powered radio proximity fuse, is applicable in the design of devices where extreme ruggedness and small size are imperative. The principal effect of the printing methods, which include hand spraying and photography, is to reduce electronic circuit wiring to two dimensions. Illustrated is a size comparison between a conventional 2-stage amplifier and a miniature amplifier for use with subminiature tubes. Their characteristics are identical.