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Speaker Protection and Fan Control Circuit

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This loudspeaker and fan controller has been specifically designed to suit the Ultra-LD 100W per channel amplifier described in the March and May 2000 issues. Not only does it provide muting at switch-on and switch-off to prevent any thumps from the loudspeakers, it also protects the loudspeakers against catastrophic failure in the amplifier. In addition, it provides temperature control for the fan-cooled heatsink, switching the fan on if the heatsink temperature rises above 60°C.

Speaker Protection Fan Control Project

Speaker Protection and Fan Control Circuit  speaker protection circuit

Source: http://www.siliconchip.com.au/cms/A_103286/article.html

Speaker Protection schematic Fan Control Circuit PCB alternative link: speaker-protection-and-fan-control-circuit.rar alternative link2 alternative link3

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