Electronics > Projects, Designs, and Technical Stuff
An audio amplifier designed for zero ohm loads?
cvanc:
Hi all-
Do we know of any prior art on amps made to drive zero ohm loads? I'm toying with a ribbon design that is a very low impedance and wonder if it is possible to find an amp that will drive it directly.
Is there perhaps something from another industry that might be re-purposed to do this?
Thanks...
dzseki:
I think it all boils down to continuous output current capability of the amplifier. With "zero Ohm" load an infinite current would flow, that ain't gona happen, so perhaps you should refine that "zero" into some more realistic number defined in mili or micro Ohms.
Gyro:
I remember an elektor magazine project for a direct drive ribbon speaker amplifier in years gone past. It will take a bit of searching, but you should be able to find it in this online archive, sorry I can't tie it down to a date...
https://www.americanradiohistory.com/Elektor.htm
NiHaoMike:
Just add a series resistor for testing. A more efficient design can be built based on the kind of MOSFET power stages used for low voltage, high current voltage regulators.
OwO:
If you have to drive a low impedance load and need low distortion, current mode feedback might work better; voltage feedback will lead to low loop gain and higher distortion.
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