Flying Mole DAD-M100

[JonSnell Electronic]

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.
Welcome to my Web site

 

[nigelwright7557]

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.

 

[JonSnell Electronic]

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

 

[JonSnell Electronic]

The link is broken for Flying Mole Service. Please use Flying Mole Repairs
Thank you

 

[JonSnell Electronic]

Another batch of 16 are fixed. Still 100% success rate.

 

[Ben9266]

DAD M100 - Distortion when increasing the output level

Hello JonSnell,


Sorry to bother you with this :


Can you tell me more precisely which MOS FET should be replaced if you still have this in mind ?


Thanks for your contribution and best regards


B. Chagniot