Current Source amplifier for low impedance loads

Dr.H · 23rd August 2011, 05:18 AM

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?

Rodeodave · 02:44 PM

Not answering your question, but anyway:
Apogee Scintilla amp
DIY amplifier for Apoogee Scintilla
and Current Source amplifier for low impedance loads

Itsmee · 23rd August 2011, 04:14 PM

Maybe a tweaked Aleph 1.2 would do the job.

Nelson Pass · 23rd August 2011, 04:42 PM

Quote:

Originally Posted by Itsmee

Maybe a tweaked Aleph 1.2 would do the job.

I think it would have to be tweaked quite a lot.

jackinnj · 23rd August 2011, 05:43 PM

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

23rd August 2011, 05:18 AM	#1
Dr.H diyAudio Member Join Date: Apr 2002	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?

23rd August 2011, 02:41 PM	#2
Rodeodave diyAudio Member Join Date: Dec 2004 Location: in the alps Blog Entries: 1	Not answering your question, but anyway: Apogee Scintilla amp DIY amplifier for Apoogee Scintilla and Current Source amplifier for low impedance loads __________________ Gravity - Making the G since 13.7 billion B.C. Last edited by Rodeodave; 23rd August 2011 at 02:44 PM.

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23rd August 2011, 04:14 PM	#3
Itsmee diyAudio Member Join Date: Feb 2009	Maybe a tweaked Aleph 1.2 would do the job.

23rd August 2011, 05:43 PM	#5
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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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