--0-1245255098-1054786112=:78580 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Content-Id: Content-Disposition: inline Crikey, this is all getting somewhat heavy seeing as the cct is a just a puny ol'audio amp. ;) Attached (4k gif) is a schematic of a hydrophone amp I made yonks back. It used a mylar spkr but didn't work too well under water coz it couldn't hack any pressure. But it should function ok as a microphone? Best - Debbie :) http://mobile.yahoo.com.au - Yahoo! 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