Sterling audio amplifier valve, c 1925, and printed circuit board, c 1950.

Sterling audio amplifier valve, c 1925, and printed circuit board, c 1950.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

By the 1920s valves were effective amplifiers and could be used in the home to drive loudspeakers. This amplifier gave out as much power as a modern transistor radio. Printed circuit boards are composed of an electronic circuit based on thin strips of a conductor on an insulating board, made by etching.

© Science Museum / Science & Society Picture Library

buy a print

Select size
 
Select finish
 
How many prints?
 
£20.00
 

buy a framed print

buy a canvas

buy a framed canvas

image details