Archive for May, 2008
NE/SA575 datasheet specifications
The NE/SA575 is a precision dual gain control circuit designed for low voltage applications. The NE/SA575’s channel 1 is an expandor, while channel 2 can be configured either for expander, compressor or automatic level controller (ALC) applications.
NE/SA575 applications: portable communications, cellular radio, cordless telephone, consumer radio, portable broadcast mixers, wireless microphones, modems, electric [...]
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 [...]
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 [...]
