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Circuit Guards Amplifier Outputs Against Overvoltage

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Abstract: To protect audio amplifiers and other automotive electronic circuits in the event of an accidental direct connection to the car battery voltage, add the circuitry shown (a shunt regulator, diodes, and an n-channel MOSFET in series with each audio path).
Maxim > App Notes > Amplifier and Comparator Circuits Audio Circuits Automotive Circuit Protection
Keywords: automotive voltage protection, dual n-channel MOSFETs, shunt regulators, class AB amplifiers Jan 06, 2011

APPLICATION NOTE 4555
Circuit Guards Amplifier Outputs Against Overvoltage


Abstract: To protect audio amplifiers and other automotive electronic circuits in the event of an accidental direct connection to the
car battery voltage, add the circuitry shown (a shunt regulator, diodes, and an n-channel MOSFET in series with each audio
path).

A similar version of this article appeared in the July 7, 2007 issue of EDN magazine.

A universal requirement for automotive electronics is that any device with direct connections to the wiring harness must be able to
with……
Circuit Guards Amplifier Outputs Against Overvoltage
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