HYDROPHONE PREAMPLIFIER

  
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Cathode-follower hydrophone isolation amplifier and high-gain preamplifier feed Navy RBA-6 low-frequency radio receiver on trawler, to receive modulated 21-kc beam that transmits trawl net depth data. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl Fishing, Electronics, 32:13, p 66-68.
HYDROPHONE PREAMPLIFIER - schematic




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