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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