This 6W amplifier with 4 tubes was indicated in an American documentation from 1947 to operate with recorders. The circuit uses a source with a transformer.
This operational amplifier configuration has gain controlled by an external voltage applied to a...
This circuit is from a 1978 publication, being connected to the contact breaker of cars that still...
January 2017 - STMicroelectronics' new TN4015H SCRs with 40 A currents and high temperature...