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From: KLUDGE@AGCB1.LARC.NASA.GOV
Newsgroups: rec.audio.high-end
Subject: Low-Z Input Amp Question
Message-ID: <5962@uwm.edu>
Date: 27 Aug 90 13:21:27 GMT
Sender: news@uwm.edu
Lines: 13
Approved: tjk@csd4.csd.uwm.edu

Have any of you instrumentation amp gurus out there ever built an amp with
an extremely low-impedance (sub-ohm) input?  I say this because I routinely
use ribbon mikes which run around 2 ohms output at the most, and usually
contain a step-up transformer to match it to a more reasonable impedance.
Trouble is, the distortion in the transformer is usually pretty high, and
magnetic pickup becomes a problem.  I'd like to eliminate the transformer
and put a line-level amp in the mike head itself, but I don't know just
how feasible this is to do.
--scott

Stay tuned next week when Kludge builds an FM IF strip with video-grade op-amps
and gets abused by the Motorola "Manna from Heaven" distributor.