Audio compander schematic
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 3.5mA at 3V and 5mA at 7V. The companding process ( input compression, output as expander) is improving the signal/noise ratio on a communication line.
NE575 contains 2 ic’s , pins 1 to 9 works as expander and the 11 to 19 pins can work as expander or compressor or automatic load control ( ALC ).
NE575 has a a high input sensitivity, the maximum input level is 1.5Vef. This compander covers a frequency domain from 20Hz to 20KHz, the total distorsions are below 1% and the signal/noise ratio is 80dB.
The compander circuit schematic :
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Miniature audio amplifier
This miniature audio amplifier delivers up to 250mW and can be used like a final stage audio amplifier for radio sets. The schematic is very simple: one BC547 transistor controls a balanced power amplifier built with BC337 and BC327. The total amplification is around 15x and is determined by R1, R3 and P1. The input sensitivity is 95mV and the total current consumption is 180mA.
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Electroschematics in RssHugger
Today we’ve registered at RssHugger.com and hope to be listed in the RssHugger blog. They seem to be ok, the site is nice and you can find good information.
