EXPOSURE X AMPLIFIER SERIES

In due course amplifiers for music and later television were also built using valves. Later, valve amplification was applied to the ' wireless' market that began in the early thirties. The first application of valve amplification was in the regeneration of long distance telephony signals. Depending on the other components in the circuit this modulated current flow can be used to provide current or voltage gain.

EXPOSURE X AMPLIFIER SERIES

The relationship between current flow and plate and grid voltage is often represented as a series of 'characteristic curves' on a diagram. This additional control grid modulates the current that flows between cathode and anode. In 1906 Lee De Forest added a third electrode and invented the first electronic amplifying device, the triode, which he named the Audion. The diode conducted electricity in one direction only and was used as a radio detector and a rectifier. The simplest valve (named diode because it had two electrodes) was invented by John Ambrose Fleming while working for the Marconi Company in London in 1904. Until the invention of the transistor in 1947, most practical high-frequency electronic amplifiers were made using thermionic valves. 4.2 Narrow band and radio frequency tuned amplifiers.4.1 Audio frequency (AF) and broadband amplifiers.

Exposure x amplifier