I am considering to use a hall-effect current sensor such as ACS-712 (http://www.allegromicro.com/en/Products/Part_Numbers/0712/0712.pdf) to protect amplifier output stage. The resistance of the copper conductive path of ACS712 is just 1.2 mR which is effective zero resistance in the intended application. It is also electrically isolated from other part of the chip. The output analog signal can be used to drive a relay circuit or sampled by ADC of an MCU.
Since the conductive path is just a piece of copper, it should not introduce any distortion. Although the chip employes chopper stabilization technique, the electrically isolated path should not be picking up any interference. Well, it might via capacitive or inductive paths.
Any comment?
Since the conductive path is just a piece of copper, it should not introduce any distortion. Although the chip employes chopper stabilization technique, the electrically isolated path should not be picking up any interference. Well, it might via capacitive or inductive paths.
Any comment?
Looks like a great idea.
But probably no worse than any other technique.
Well, it might via capacitive or inductive paths.
But probably no worse than any other technique.
I posted one a while back, Still in daily use
hall effect dc speaker protection
hall effect dc speaker protection
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