Re: Bitx40 Fuses
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Woody
¿ªÔÆÌåÓýOn 8/22/2019 21:38, Donald wrote:
Jerry Gaffke, in post #44333, suggested using a 1/2A fuse for the main board, and using 2A or 3 A for the PA. Perhaps a little over-kill, but... That would provide the ultimate protection for the board, mostly by avoiding burning of circuit board traces in the event of a short.? As they say, silicon is faster to blow than a fuse ;)?? Reverse polarity power can kill semiconductors, then (if they go shorted) blow the fuse.? That is why a shunt power diode is useful in addition to a only fuse - to blow the fuse before the reverse polarity voltage reaches critical devices.? A series diode will stop the reverse voltage without blowing the fuse but will add about a 0.6 volt drop to the equipment. Woody --
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