Tools of Science series: The Armstrong Regenerative Circuit - Its invention and application
Edwin Howard Armstrong invented the regenerative circuit as an undergraduate student in 1914. This circuit enabled a very high amplification to be obtained in simple radio receivers using few valves. Its use allowed affordable radio receivers to be made available in the early days of broadcasting, when more elaborate radios were beyond the means of many.
Although Edwin Armstrong patented this invention, it was challenged by Lee DeForest, who, after many years of litigation, won the patent rights. This decision is widely seen as a miscarriage of justice.
About the speaker
Stuart Irwin became interested in electronics as a hobby from a young age. He has worked as a gas and electronics technician. He has completed 3 years of a microelectronics degree but had to drop out due to ill health. He has been collecting and restoring vintage radios for 30 years and is a member of the Historical Radio Society of Australia and the Historical Wireless Society of South East Queensland.