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Class D Switching Power Amplifiers and Power D/A conversion

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Old 13th February 2013, 09:54 PM   #1
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Thumbs up Flying Mole DAD-M100

I have just repaired two of these rather nice amplifiers.
There is no schematic or information available, so it was experience alone!

The first one was fairly easy; Distortion when increasing the output level. I replaced the MOS FET output stages and that sorted that one.
The second had weird noises and distortion; replace the Sony BX chips and repair the power supply fault that caused the problem in the first place.
I replace the power supply components in the first one as well as the second for added reliability.
I do like a challenge.
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Old 14th February 2013, 11:41 PM   #2
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I have designed numerous class d amps.
They consist of output transistors, class d IC and discrete components.
Every fault I have found has been the output transistors and/or the class d IC.
The mosfets can go short D-S and sometimes G-S.
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Old 17th July 2013, 08:44 AM   #3
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Quote:
Originally Posted by nigelwright7557 View Post
I have designed numerous class d amps.
They consist of output transistors, class d IC and discrete components.
Every fault I have found has been the output transistors and/or the class d IC.
The mosfets can go short D-S and sometimes G-S.
Yes they do. With the moles the power supply running at 110volts tends to be strained and can fail at heavy and prolonged sound levels.
Nice amps though!
see Flying Mole Service
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Old 16th August 2013, 09:45 PM   #4
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The link is broken for Flying Mole Service. Please use Flying Mole Repairs
Thank you
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Old 17th August 2013, 10:51 PM   #5
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Another batch of 16 are fixed. Still 100% success rate.
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