Hi-fi-expander-with-de-emphasis

  
The expander to complement the compressor is shown. An external op amp is used for high slew rate. Both the compressor and expander have unity gain levels of 0 dB. Trim networks are shown for distortion (THD) and de shift. The distortion trim should be done first, with an input of 0 dB at 10 kHz. The de shift should be adjusted for minimum envelope bounce with tone bursts.
Hi-fi-expander-with-de-emphasis - schematic

When applied to consumer tape recorders, the subjective performance oi this system is excellent.




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