[sdiy] Delays and companders

Tim Ressel timr at circuitabbey.com
Mon Mar 4 19:07:27 CET 2019


In making a BBD delay often a compander is used to reduce noise. One 
schematic had a clever circuit that used one rms-dc block to run both 
the compressor and expander VCAs. This would make sense in a non-delay 
circuit. But in a delay where the output is not time aligned with the 
input, is it the right thing to do? It seems to me you want completely 
separate compressor and expander circuits with their own rms-dc blocks. 
Say a pair of 4305s from That Semi. Or am I in the weeds here?

--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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