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Bitx40 Fuses

Donald
 

Jerry Gaffke, in post #44333, suggested using a 1/2A fuse for the main board, and using 2A or 3 A for the PA.
Any suggestions otherwise?

Woody
 

On 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.
Any suggestions otherwise?

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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