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12th November 2006, 08:12 PM
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#1 |
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diyAudio Member
Join Date: Jan 2006
Location: at home
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Amp non working
Hello!
It is an car amplifier 50W+50W but is not working. When i connect both channels everything is ok untill i turn high the volume speakers start buzzing. There is a small "protect" led and turn on when this happens. Some kind of protection. When i connect only "left channel" it works well at high volumes so i think the dc-dc convert stage is working perfectly, i have also measured dc-dc stage voltage and is +-30V. Also i have connected another amplifier and works without problems. I think the right channel is oscillating but i do not why. I have replaced all output transistors MJE2955/3055 but the phenomenom is always there. Could you help? Thank you! |
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