The circuit begins with a vacuum tube used as a plain audio amplifier usually placed electrically near the main input. The method was quite simple.
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This would be accomplished with a rectifier most often a twin diode tube.
Audio expander circuit. The companding process input compression output as expander is improving the signalnoise ratio on a communication line. The incoming audio signal is amplified and then must be changed into a direct current controlling voltage. NE575 contains 2 ics pins 1 to 9 works as expander and the 11 to 19 pins can work as expander.
This audio compander circuit schematic is equiped with NE575 produced by Signetics it is working with a 3 7V battery and has a current consumption of 35mA at 3V and 5mA at 7V. Thus a controlling voltage was produced that varied with the intensity of the audio.
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