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23-12-2009 #5
thats the second of these that went bang... see [ame="http://www.mycncuk.com/forums/showpost.php?p=9250&postcount=24"]here[/ame]
I think they are unable to cope with the back-emf from a bigger motor and above 30v suffer some catastrophic breakdown... could be the protection diodes are not fast enough...
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