Current Source amplifier for low impedance loads

[Dr.H]

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]

Not answering your question, but anyway:
http://www.diyaudio.com/forums/pass-labs/8353-apogee-scintilla-amp.html
http://www.diyaudio.com/forums/solid-state/42385-diy-amplifier-apoogee-scintilla.html
and http://www.diyaudio.com/forums/solid-state/195154-current-source-amplifier-low-impedance-loads.html 😀

 

[Itsmee]

Maybe a tweaked Aleph 1.2 would do the job.

 

[Nelson Pass]

Maybe a tweaked Aleph 1.2 would do the job.

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

😎

 

[jackinnj]

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