No fuses in gainclones?

MtBiker · 1st February 2005, 05:41 AM

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?

digi01 · 1st February 2005, 06:13 AM

I think fuses and circuit protection is necessary,I do not hope the expensive loudspeaker is risky.

Mr Evil · 1st February 2005, 11:17 AM

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!

peranders · 1st February 2005, 11:32 AM

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.

kmj · 1st February 2005, 05:34 PM

Same here, one primary, two secondarys.

OT
PA
Du nämnde en trådleverantör i göteborg på hififorum, var det månne en trafolindare?
om så, har du lust att berätta vad företaget heter?

MtBiker · 1st February 2005, 05:45 PM

Secondary fuses between the transformer's secondaries and the diode bridges, or after the bridges on each rail?

scone · 1st February 2005, 06:35 PM

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.)

skyraider · 1st February 2005, 11:56 PM

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.

peranders · 2nd February 2005, 05:11 AM

Quote:

Originally posted by kmj
OT
PA
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...

scone · 2nd February 2005, 01:37 PM

Quote:

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.

1st February 2005, 05:41 AM	#1
MtBiker diyAudio Member Join Date: Jul 2002 Location: Northern Virginia	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?

1st February 2005, 11:17 AM	#3
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	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! __________________ https://mrevil.asvachin.eu/

1st February 2005, 11:32 AM	#4
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me

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1st February 2005, 06:13 AM	#2
digi01 diyAudio Member Join Date: Mar 2003 Location: BEIJING	I think fuses and circuit protection is necessary,I do not hope the expensive loudspeaker is risky.

1st February 2005, 05:34 PM	#5
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	Same here, one primary, two secondarys. OT PA Du nämnde en trådleverantör i göteborg på hififorum, var det månne en trafolindare? om så, har du lust att berätta vad företaget heter?

1st February 2005, 05:45 PM	#6
MtBiker diyAudio Member Join Date: Jul 2002 Location: Northern Virginia	Secondary fuses between the transformer's secondaries and the diode bridges, or after the bridges on each rail?

1st February 2005, 11:56 PM	#8
skyraider diyAudio Member Join Date: Jan 2004 Location: malaysia	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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