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Old 24th February 2006, 07:45 AM   #1
anton is offline anton  Italy
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I have a question about a PPI amps. since 1990 i have a 2075M
(very nice amp) 75x2 4 ohm, 150x2 2ohm 300x1, manual says to put a 20A fuse. last week i saw a PPI art serie, model was A300, 75x2 150x2 300x1, fuse 40A. My question is why a so big difference of fuses between 2 amps of same power.
I look inside the 2 amps and they are almost the same, I mean mosfet for power supply, BJT for amp stage etc... How is possible that fuse difference?
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Old 24th February 2006, 10:41 AM   #2
anton is offline anton  Italy
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Old 24th February 2006, 11:20 AM   #3
AndrewT is online now AndrewT  Scotland
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Hi,
is this the mains supply fuse?
or the secondary fuses in the DC power rails?
or the output fuse on the loudspeaker line?

It seems mighty large for any of them!
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regards Andrew T.
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Old 24th February 2006, 01:55 PM   #4
clem_o is offline clem_o  Philippines
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Car amplifier perhaps?? Power-in fuse...
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Old 24th February 2006, 06:34 PM   #5
anatech is offline anatech  Canada
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Yup, it's a car amp.

-Chris
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Old 24th February 2006, 08:01 PM   #6
K-amps is offline K-amps  United States
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If the latter amp has more OP devices then it can handle more current thus ok with 40amp fuse. Do not assume your's can run with the 40A fuse unless you have compared the schematics of both and they are identical.
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Old 25th February 2006, 07:12 AM   #7
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Quote:
Do not assume your's can run with the 40A fuse unless you have compared the schematics of both and they are identical.
Even if they were identical,why double the rating of the fuse for no reason? If it works with a 20A fuse without blowing it,I'd just leave it at that.
You might lower the resistance of the power supply with a larger fuse,but you also defeat any protection the fuse offered in the first place.
Then again,We all know the silicon will die first to protect the fuse,So what's it matter?! The magic smoke would get out one way or another!
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