Universal Audio 1176AE User Manual
Page 33
The Technical Stuff
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A bias level is applied to the diodes by the Compression Ratio pushbutton switches. This controls the
threshold of limiting, and is adjusted for the correct value as determined by the currently selected
compression ratio selection. R55 controls the compressor’s attack time
by regulating how fast C22 is
charged. Likewise, R56 determines the compressor’s release time by controlling the rate at which
C22 discharges. The output of this stage is then applied to the gate of the FET in the gain reduction
circuit, which in turn controls the gain in the manner previously described.