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DIY & Tutorials
DIY For Audio
The ultimate speaker protection system
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<blockquote data-quote="valvesound" data-source="post: 579354" data-attributes="member: 14075"><p>Hi Ian....an idea that should work is:</p><p></p><p>Have two relays both NOC. Call them A and B. A is used in series with the speaker and B shunted to ground through a low resistor value.</p><p>(Lower value than the speaker voice-coil resistance you trying to protect.)</p><p></p><p></p><p>Relay B is placed between amp output and relay A.</p><p></p><p>Under normal conditions A is closed and B is open.</p><p>As the fault condition appears relay B is closed immediately and now shunts most of the current to ground. You then open relay A (which now has very little current flowing through it and should be able to open contact easily)</p><p>Then once A is open you open relay B again and all is safe. Except for the fault condition on the amp of course.</p><p></p><p>This process will be quick enough that the low resistance shunt resistor need not be of such a great wattage as before it gets too hot it will be out of the circuit again.</p></blockquote><p></p>
[QUOTE="valvesound, post: 579354, member: 14075"] Hi Ian....an idea that should work is: Have two relays both NOC. Call them A and B. A is used in series with the speaker and B shunted to ground through a low resistor value. (Lower value than the speaker voice-coil resistance you trying to protect.) Relay B is placed between amp output and relay A. Under normal conditions A is closed and B is open. As the fault condition appears relay B is closed immediately and now shunts most of the current to ground. You then open relay A (which now has very little current flowing through it and should be able to open contact easily) Then once A is open you open relay B again and all is safe. Except for the fault condition on the amp of course. This process will be quick enough that the low resistance shunt resistor need not be of such a great wattage as before it gets too hot it will be out of the circuit again. [/QUOTE]
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DIY & Tutorials
DIY For Audio
The ultimate speaker protection system
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