Which fuse to use?
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| Sep 12th 2012, 00:48 | |
N8FNRTotal Topics: 0 Total Posts: 0 |
I recently bought a switching gasafet ARR preamp for 70cm to use with a Arrow dual band handheld antenna to hear the downlink from the FM satellites. http://www.advancedreceiver.com/page7.html The preamp draws 100ma at 12v and the wire I am using is 16 gauge and about 1 meter long. I would like to fuse the positive line because I really want to protect the preamp and wonder what is the ideal fuse rating I should use? BTW I went to Radio Shack today and the smallest rated fuse they had was a quick blow 1/4 amp for 250v. Would it be ideal to use a blade type car fuse rated for 1 amp for my application as that seems the lowest rated commonly available one? Any suggestions on this will be greatly appreciated. Zack N8FNR |
| Sep 12th 2012, 13:33 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
A 1A fuse near the battery is a good idea if the supply voltage somehow gets shorted to ground. Without a fuse, many batteries can dump enough current into the wires to start a fire! ARR preamps typically have diodes for reverse polarity protection. Zack Lau W1VT ARRL Senior Lab Engineer |
| Sep 12th 2012, 19:22 | |
N8FNRTotal Topics: 0 Total Posts: 0 |
Thanks for the reply. I will go with the 1A fuse. Zack N8FNR |
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