Electronics > Projects, Designs, and Technical Stuff
An audio amplifier designed for zero ohm loads?
fcb:
You are looking for a 'transconductance amplifier'.
It converts voltage into current (a transconductance amplifier with 1S (Siemens, the unit of transconductance) will output 1A for an input of 1V).
If you want to repurpose something from industry, probably look for a Fluke 5220A - 2nd hand these are quite expensive though (probably not high enough compliance voltage for ribbon speaker at 'tweeter' frequencies).
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