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A Speech Processor for the FT-817 - Information from eHam and Ok1CDJ Back to Projects and Kits main page Speech Compressor for FT-817 OK1CDJ
FT-817
doesn't have any type of speech processing built-in.This audio speech
compressor is designed with the Analog Devices SSM2165 device. The
circuit is small enough that it can be built into the microphone.Gain of
whole circuit is about 18dB, compression ratio is set by R1 and can be
varied from 1:1 to 15:1. Output level can be set by R2, R3. Power
consumption is around 7.5mA. Compressor is supplied directly from
microphone, no external power supply is needed.
Compressor is completely build using SMT on small board (15x11mm).
Fig. 2 - PCB
Part list:
C1 22uF /10V size B
C2 10uF /10V size B
C3 10uF /10V size B
C4 100nF 0805
C5 100nF 0805
C6 1nF 0805
C7 100nF 0805
IC1 SSM2165 SO08
R1 180k 0805
R2 22k 0805
R3 620 0805
DYC-817 Speech Processor / Compressor |
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