Audio Compressor Expander Circuit

The led from the opto isolator is connected to the speaker terminals via a current limiting resistor in conjunction with potentiometer vr 1 to sample the program.

Audio compressor expander circuit. An audio compressor is designed to compress the dynamic range of an audio signal by reducing the volume of loud sounds while amplifying quieter sounds. Some might get confused sometimes when compressor expander and gate are discussed and especially when concepts like upward downward parallel or such like are thrown in. The differential amplifier is interconnected by a diode attenuator circuit which varies the gain of the differential amplifier as a function of a rectified signal derived from the expander input signals. A p channel jfet.

Dynamic range compression drc or simply compression is an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds thus reducing or compressing an audio signal s dynamic range compression is commonly used in sound recording and reproduction broadcasting live sound reinforcement and in some instrument amplifiers. The original 100 db of dynamic range is thus compressed to a 50 db range for transmission through a restricted dynamic range channel. The companding process input compression output as expander is improving the signal noise ratio on a communication line. A complementary expansion on the receiving end restores the original signal levels and reduces the channel noise by as much as 45 db.

Fortunately things can easily be explained just by looking at the according transfer curves and as an added sugar some more sophisticated insights can be obtained es well. Audio limiter circuit p. Audio feed forward compressor limiter compressors are flexible products commonly used in sound recording live sound productions and broadcast. 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.

Optical compressors in this type of compressor a photo optical detector circuit controls how much gain will be reduced. The significant circuits in a compressor or expander are. The expander compressor uses an opto isolator. Passive dynamic audio compressor.

This is an audio compressor agc automatic gain control with an astonishing 75db input voltage range. This audio limiter circuit is easy to build works with ba741 8pins or 4pins so pay attention and. This results in a more transparent sound. The circuit expander compressor furnishes both the functions compression and expansion often expressed by the term compander easily.

This type of compressor adds a lot of color or changes to the original sound but this can be exactly the type of energy and result you are looking for.