Resistor's Burn :( on STK-4046XI

Morbid · 25th August 2004, 09:56 PM

hi, I've built the STK-4046XI amp and it worked well...there is
4 output resistors (0.22ohm )in parallel that connect to speaker via L1 and 4.7ohm resistor....
the 4.7ohm resistor burned while ago and it kept playing
and then few days ago the L1 (4mh) burned.. i dont know the reason cause it worked well....so i tried to connect the loudspeaker to the end of the 4 output (0.22ohm) resistors and the fuse for the speaker end burned...

the schematic attached..
load is 4ohms, maybe i need different configuration or bigger resistor? it was 1 or 2 WATT the resistor.....

thanks!

Morbid · 26th August 2004, 03:19 PM

help someone?!

maybe i should change the configure to 16ohm (serial) instead of 4ohm (parallel)?

pleaseeeeeeee!!!

thomas997 · 26th August 2004, 10:51 PM

Same thing happened to me, resister emit a puff of smoke and shorted.

What wattage are they?

Seeing as you used 4 in parallel, assuming they are quarter watt, should give you a watt which should be fine.

hm

Morbid · 26th August 2004, 11:07 PM

the 4 resistors in parrallel was 5WATT EACH
and they didn't get burned but the 4mh (l1) and the 0.47 resistor burned (maybe i will put them 5WATT too)....

Gofer · 26th August 2004, 11:50 PM

I think your STK module oscilated, thats why your zobel resistor burned out. During that your chip heated up. Did you use a heatsink?
I hope so because your project can be saved.
Check the schematic and the outlay of the PCB.
Did you used ''good'' grounding ?
Show me how you build this thing. (picture please)
Good luck !

Gofer

Morbid · 27th August 2004, 04:55 AM

i use BIG heat sink, never de-attached...the module is still ok when i tried to connect the speaker directly to the 4 output end (before the burned resistor and L1) i heared a little hum sound and when i connected the signal the fuse burned (i think too much current before the resistors)

m60gpmg · 27th August 2004, 09:51 AM

You write:

Quote:

and then few days ago the L1 (4mh) burned.....

Quote:

and they didn't get burned but the 4mh (l1) and....

But in the schematic L1 is 4uH not 4mH

Regards
D.N.

Morbid · 27th August 2004, 03:22 PM

okits micro Henry uH, eitherway it was

any suggestions?

Morbid · 28th August 2004, 09:46 PM

no one?

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26th August 2004, 03:19 PM	#2
Morbid diyAudio Member Join Date: Jun 2004 Location: israel	help someone?! maybe i should change the configure to 16ohm (serial) instead of 4ohm (parallel)? pleaseeeeeeee!!!

26th August 2004, 10:51 PM	#3
thomas997 diyAudio Member Join Date: Feb 2004 Location: Vancouver	Same thing happened to me, resister emit a puff of smoke and shorted. What wattage are they? Seeing as you used 4 in parallel, assuming they are quarter watt, should give you a watt which should be fine. hm

26th August 2004, 11:07 PM	#4
Morbid diyAudio Member Join Date: Jun 2004 Location: israel	the 4 resistors in parrallel was 5WATT EACH and they didn't get burned but the 4mh (l1) and the 0.47 resistor burned (maybe i will put them 5WATT too)....

26th August 2004, 11:50 PM	#5
Gofer diyAudio Member Join Date: Oct 2002 Location: Amsterdam	I think your STK module oscilated, thats why your zobel resistor burned out. During that your chip heated up. Did you use a heatsink? I hope so because your project can be saved. Check the schematic and the outlay of the PCB. Did you used ''good'' grounding ? Show me how you build this thing. (picture please) Good luck ! Gofer

27th August 2004, 04:55 AM	#6
Morbid diyAudio Member Join Date: Jun 2004 Location: israel	i use BIG heat sink, never de-attached...the module is still ok when i tried to connect the speaker directly to the 4 output end (before the burned resistor and L1) i heared a little hum sound and when i connected the signal the fuse burned (i think too much current before the resistors)

27th August 2004, 03:22 PM	#8
Morbid diyAudio Member Join Date: Jun 2004 Location: israel	okits micro Henry uH, eitherway it was any suggestions?

28th August 2004, 09:46 PM	#9
Morbid diyAudio Member Join Date: Jun 2004 Location: israel	no one?

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