Synchro
Videos
A synchro is, in effect, a transformer whose primary-to-secondary coupling may be varied by physically changing the relative orientation of the two windings. Synchros are often used for measuring the
A picture of a synchro transmitter
View of the connection diagram of a synchro transmitter
Amplidyne
Videos
An amplidyne is an obsolete electromechanical amplifier invented prior to World War II by Ernst Alexanderson. It consists of an electric motor driving a DC generator. The signal to be amplified is app
Three amplidynes, from a 1951 General Electric advertisement (not to same scale). (top left) 1 kW amplidyne motor–generator, (bottom left) 3 kW amplidyne motor–generator, (right) 5 kW amplidyne generator.