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Old 28th May 2009, 10:02 PM   #1
diyAudio Member
Join Date: May 2009
Default AB Amp keep blowing fuse

I have an AB amplifier that keep blowing fuses.
Iam using the correct fuse.
It will power up then slowly the power light goes out after few second.
Thanks for some help.

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Old 28th May 2009, 10:24 PM   #2
diyAudio Member
Join Date: Oct 2007
Hi! Can you post the schematic, or its link? There's got to be a trimpot to set the quiescent current, take a look at it to know if it's all the way to right or left... probably quiescent current is too high, and be careful, if the trimpot is set at max quiescent current, the output trannies will reach the Hades in less than two
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Old 28th May 2009, 10:36 PM   #3
Arcaman is offline Arcaman  Italy
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Join Date: Mar 2009
Does it without any load connected ?
Have you checked if the voltage selector is in the right position, if present?
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Old 29th May 2009, 01:19 AM   #4
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Join Date: Apr 2008
Location: Carlisle, England
If you havent adjusted the presets then its probably the output transistors gone.
Anything else usually doesnt take enough current to blow the fuses although a shorted capacitor might.
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
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