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Old 23rd August 2011, 05:18 AM   #1
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Default Current Source amplifier for low impedance loads

I have a very difficult speaker, Apogee Scintilla, impedance dropping to 0.7 ohms or so.
I'd like to DIY a CURRENT SOURCE amp, something like this:
http://apogee-acoustics.de/download/..._Apogee_EN.pdf

Any leads/ideas/schematics?
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Old 23rd August 2011, 02:41 PM   #2
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Not answering your question, but anyway:
Apogee Scintilla amp
DIY amplifier for Apoogee Scintilla
and Current Source amplifier for low impedance loads
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Last edited by Rodeodave; 23rd August 2011 at 02:44 PM.
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Old 23rd August 2011, 04:14 PM   #3
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Maybe a tweaked Aleph 1.2 would do the job.
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Old 23rd August 2011, 04:42 PM   #4
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Quote:
Originally Posted by Itsmee View Post
Maybe a tweaked Aleph 1.2 would do the job.
I think it would have to be tweaked quite a lot.

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Old 23rd August 2011, 05:43 PM   #5
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I've made a Howland Current Source with an LM3886 -- and it wasn't very happy! The OPA2544 did a better job. Probably not enough current for what you're trying to do...

Read these:
Bob Pease: http://www.national.com/an/AN/AN-1515.pdf
Apex VCCS: http://www.cirrus.com/en/pubs/appNote/Apex_AN13U_D.pdf
http://www.passdiy.com/pdf/cs-amps-speakers.pdf
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