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Old 1st February 2005, 05:41 AM   #1
MtBiker is offline MtBiker  United States
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Default No fuses in gainclones?

I rarely see many (if any) fuses on chip amps. I can find tons of schematics for large solid state amps that have a fuse before the transformer and one on each rail within the amp, but I never see more than a single fuse in a gainclone? Is the short circuit protection on the LMxxxx so good that fuses are not necessary?
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Old 1st February 2005, 06:13 AM   #2
digi01 is offline digi01  China
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I think fuses and circuit protection is necessary,I do not hope the expensive loudspeaker is risky.
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Old 1st February 2005, 11:17 AM   #3
Mr Evil is offline Mr Evil  United Kingdom
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I think a fuse before the transformer primary is assumed to be there, and thus not necessarily shown. You should most definitely not build anything mains powered without a fuse!
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Old 1st February 2005, 11:32 AM   #4
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The primary fuse is mainly for the protection of the transformer. Secondary fuses help better to protect things after the fuses. I have fuses in both locations, but that's me.
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Old 1st February 2005, 05:34 PM   #5
kmj is offline kmj  Sweden
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Same here, one primary, two secondarys.

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Du nämnde en trådleverantör i göteborg på hififorum, var det månne en trafolindare?
om så, har du lust att berätta vad företaget heter?
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Old 1st February 2005, 05:45 PM   #6
MtBiker is offline MtBiker  United States
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Secondary fuses between the transformer's secondaries and the diode bridges, or after the bridges on each rail?
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Old 1st February 2005, 06:35 PM   #7
scone is offline scone  United States
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Quote:
Originally posted by MtBiker
Secondary fuses between the transformer's secondaries and the diode bridges, or after the bridges on each rail?
I've seen both. I have one on the AC mains and two after the PS board on the +V and -V rails... reasoning is that I'm protecting my amplifier boards from my PS just in case something shorts near the opamps. (Perhaps not a problem in most cases, but my PS can do 15A at 31V on paper and I'd rather not take the chance.)
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Old 1st February 2005, 11:56 PM   #8
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best fuse is no fuse at all. Ceramic fuse 'mellows' the sound, but silver fuse can make the sound 'thin' hehehe...

Not using fuse is breaking the law from another point of view. I just use the fuse in the 3-pin plug for protection purpose. I didnt use secondary fuse for cost and simplicity reason. But if your chip is the last piece you have on earth, you better use it.
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Old 2nd February 2005, 05:11 AM   #9
Electrons are yellow and more is better!
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Quote:
Originally posted by kmj
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Du nämnde en trådleverantör i göteborg på hififorum, var det månne en trafolindare?
om så, har du lust att berätta vad företaget heter?
You have got email...
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Old 2nd February 2005, 01:37 PM   #10
scone is offline scone  United States
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Originally posted by skyraider
best fuse is no fuse at all. Ceramic fuse 'mellows' the sound, but silver fuse can make the sound 'thin' hehehe...
Only if you fuse the audio signal.
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