diy short circuit protection

andrewlebon · 28th September 2011, 12:32 AM

hi
greetings looking for simple diy short circuit protection schematic which can be incoporated into amplifiers any help will be helpful
short circuit i mean if speaker wires touch each other ACCIDENTALLY
warm regards
andrew lebon

nigelwright7557 · 28th September 2011, 12:38 AM

You really need a circuit integrated into the amplifier itself.
Do a search of DIYAUDIO and you find loads.

Alternatively use a fast blow fuse.

stratus46 · 28th September 2011, 12:53 AM

Quote:

Originally Posted by nigelwright7557

<snip>

Alternatively use a fast blow fuse.

Fuses suck. They blow right after the amplifier fails. How about don't fool with the wires while it's running? After I blew up enough amps I decided not to mess with the wiring while it's playing and haven't had an issue in over 30 years.

G²

nigelwright7557 · 28th September 2011, 01:03 AM

Quote:

Originally Posted by stratus46

Fuses suck. They blow right after the amplifier fails. How about don't fool with the wires while it's running? After I blew up enough amps I decided not to mess with the wiring while it's playing and haven't had an issue in over 30 years.

G²

I have had some success with fuses.
I tripped over a speaker wire and shorted it out and the fuse blew before the amp. I guess its getting the fuse value right, not so small it blows for no reason and not so big it doesnt blow at all.

Tajzmaj · 28th September 2011, 01:19 AM

Transistor is the fastest fuse...

Amplifier must have all protections included in it's own circuit. It is almost impostble to do it ,,outboard,,
But of course fuse can work ..... at least sometimes and it depends what is the amp....build for. If you need it to power some pub....sound system than is more than ok. In case of hi-end, no thanks....it is not just a wite in glass tube but is unlinear element in pwr rails.....or in the signal chain.....it depends. But one thing is sure. In terms of safety very recomended to prevent fire.....or at leat high damage...
Regards, Taj

gmphadte · 28th September 2011, 07:06 AM

U have to watch the voltage across the high wattage resistors connected in series with output transistors.

Gajanan Phadte

28th September 2011, 12:32 AM	#1
andrewlebon diyAudio Member Join Date: Feb 2008	diy short circuit protection hi greetings looking for simple diy short circuit protection schematic which can be incoporated into amplifiers any help will be helpful short circuit i mean if speaker wires touch each other ACCIDENTALLY warm regards andrew lebon

28th September 2011, 12:38 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	You really need a circuit integrated into the amplifier itself. Do a search of DIYAUDIO and you find loads. Alternatively use a fast blow fuse. __________________ http://www.murtonpikesystems.co.uk PCBCAD50 pcb design software.

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28th September 2011, 01:19 AM	#5
Tajzmaj diyAudio Member Join Date: Mar 2011 Location: Ljubljana	Transistor is the fastest fuse... Amplifier must have all protections included in it's own circuit. It is almost impostble to do it ,,outboard,, But of course fuse can work ..... at least sometimes and it depends what is the amp....build for. If you need it to power some pub....sound system than is more than ok. In case of hi-end, no thanks....it is not just a wite in glass tube but is unlinear element in pwr rails.....or in the signal chain.....it depends. But one thing is sure. In terms of safety very recomended to prevent fire.....or at leat high damage... Regards, Taj

28th September 2011, 07:06 AM	#6
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	U have to watch the voltage across the high wattage resistors connected in series with output transistors. Gajanan Phadte