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DIY & Tutorials
DIY For Audio
The ultimate speaker protection system
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<blockquote data-quote="handsome" data-source="post: 579129" data-attributes="member: 772"><p>Since the relay is the problem why not look at electronic switching? MOSFETs are designed to switch at very high speeds far quicker than any relay and do not suffer from 'bounce' as relays do.</p><p>Switch the rails instead of the speaker; place a MOSFET configured as a source follower in each rail, when a fault is detected the MOSFET can be switched off thereby removing the rail/current path. </p><p>Or shunt the current around the speaker; use a MOSFET (or triac as mentioned before) to connect the speaker line to earth thus diverting the fault current. The Fukushima scenario could be avoided by having the same circuitry that triggers the shunt also shutdown the amplifier at the same time - which any protection circuitry intuitively should do anyway as an extra layer of protection.......</p></blockquote><p></p>
[QUOTE="handsome, post: 579129, member: 772"] Since the relay is the problem why not look at electronic switching? MOSFETs are designed to switch at very high speeds far quicker than any relay and do not suffer from 'bounce' as relays do. Switch the rails instead of the speaker; place a MOSFET configured as a source follower in each rail, when a fault is detected the MOSFET can be switched off thereby removing the rail/current path. Or shunt the current around the speaker; use a MOSFET (or triac as mentioned before) to connect the speaker line to earth thus diverting the fault current. The Fukushima scenario could be avoided by having the same circuitry that triggers the shunt also shutdown the amplifier at the same time - which any protection circuitry intuitively should do anyway as an extra layer of protection....... [/QUOTE]
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DIY & Tutorials
DIY For Audio
The ultimate speaker protection system
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