Xref: utzoo rec.audio:16895 sci.electronics:8793
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ginger.acc.com!ivucsb!todd
From: todd@ivucsb.sba.ca.us (Todd Day)
Newsgroups: rec.audio,sci.electronics
Subject: Current Amplifiers (are there any on the market?)
Message-ID: <1989Nov27.084236.1496@ivucsb.sba.ca.us>
Date: 27 Nov 89 08:42:36 GMT
Reply-To: todd@ivucsb.sba.ca.us (Todd Day)
Followup-To: rec.audio
Organization: Lazy Engineers Who Drive Sportscars, Santa Barbara, CA
Lines: 21

Recently, a co-worker and I built a voltage controlled current amp to
drive a set of huge coils which had about the same characteristics as
speaker coils.  So, we thought, what the heck?  I brought in a 15"
woofer and ran some tests.  The current amplifier worked very well, even
at the free-air resonant frequency of the woofer.

It seems to me that since the magnetic field of the coils is proportional
to the current passing through them, a current amplifier will control the
cone much more accurately than a voltage amplifier would.

Has anyone else done or know of experiments in this area?  There is an
article on it in the latest JAES, but I think it's kinda hokey.  Also,
has there ever been an current amplifier on the market?  I don't think
there are any today.

[Note: followups-to rec.audio]

-- 
Todd Day  |  todd@ivucsb.sba.ca.us  |  ivucsb!todd@anise.acc.com
"A rubber hose is just as effective, and it doesn't leave any marks"
					-- Donna Reed


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