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Nuts & Volts Magazine (January 2018)

Speaker Protection and Muting with an Optical Coupler

By Vasile Gorcea    View Digital Edition  


Vintage amplifiers may sound great, but in many cases they lack any form of output protection. In the event of a catastrophic output failure, some amps deliver the full power supply rail voltage to the speakers! This circuit not only protects your speakers from amp failure, but also eliminates the dreaded “turn on thump” some classic solid-state amplifiers exhibit.

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201801-Gorcea.zip

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Parts List
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