50W Stereo Kit amp runs for 1 min, clips then turns off. - Page 3 - diyAudio
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Old 3rd March 2012, 07:25 AM   #21
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Looks to be 7.7ohms.
That is good!
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Old 3rd March 2012, 07:28 AM   #22
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yes that 7.7 ohms should not cause a problem. Rule that out as a problem
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Old 3rd March 2012, 07:32 AM   #23
Al600 is offline Al600  Australia
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I've tried out each channel seperatly by removing the 2 fuses within each channel. Unfortunatly the problem seems to occur in each channel regardless of if the other channel is being used.
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Old 3rd March 2012, 07:33 AM   #24
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Did you put the ground on both channels? Because if you see the right channel the wire is not like the left channel. missing ground from input. move the ground from speaker of the right channel and put the ground for the input where the speaker ground is now and get a wire from "0" power supply to there.
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Old 3rd March 2012, 07:39 AM   #25
Al600 is offline Al600  Australia
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Once again you're dead right. I'll go and fix that with a red face.
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Old 3rd March 2012, 07:45 AM   #26
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Once again you're dead right. I'll go and fix that with a red face.
lol...Make sure you do not have a "floating ground". it should be to the chassis.
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Old 3rd March 2012, 07:47 AM   #27
Al600 is offline Al600  Australia
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Ok. So although that was another mistake, unfortunatly it is not the mistake as it is a common ground between speaker and signal. Changing that wire has made it conform to the diagram but since it was already connected to ground it has not changed the problem. I have also run the speaker/input ground to the 0V of the power supply but to no avail.
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Old 3rd March 2012, 07:50 AM   #28
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Ok. So although that was another mistake, unfortunatly it is not the mistake as it is a common ground between speaker and signal. Changing that wire has made it conform to the diagram but since it was already connected to ground it has not changed the problem. I have also run the speaker/input ground to the 0V of the power supply but to no avail.
ok. if you fallow all from schematic, now is time to check those LM3886. if you have "spare" just replace one to see.
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Old 3rd March 2012, 07:52 AM   #29
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can you post a picture of your work so far?
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Old 3rd March 2012, 07:54 AM   #30
Al600 is offline Al600  Australia
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I don't have any spares as it came as a kit and I won't have access to any parts for a few days. I'm just relying on the intelligence of others at this point.
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