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Old 19th September 2013, 04:49 AM   #1
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Default Digital design

Hi guys:
I'm working on a digital design amp, not sure what the model
Number is all it has is a sticker, see attached picture.
All MOSFET output are shorted out, and the audio driver board
Have 7 ICs all are Burt out, and can not reed the part number, can
Some one please tell me the part number of these ICs,
Thnaks in advance.
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Old 19th September 2013, 04:56 AM   #2
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2nd pic
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Old 19th September 2013, 04:58 AM   #3
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3rd pic
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Old 19th September 2013, 05:10 AM   #4
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I believe the amp you have is a Digital Designs Z2

The 4 large IC's are IR21844S

The IC in U6's location is a LM293

U3 is a TL072C

U4 is a LM211

If rebuilding the driverboard also replace all transistors marked 1D,2D,1A,2A

Also Q6 fails sometimes which is a KTD1304

Last edited by S Merlington; 19th September 2013 at 05:12 AM.
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Old 19th September 2013, 12:47 PM   #5
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It appears that some of the resistors burned. If so, the attached image should help.
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Old 19th September 2013, 02:17 PM   #6
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After rebuilding the driver board, can I test this unit without
Audio output mosfets? Just want to play it save if possible.
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Old 19th September 2013, 02:38 PM   #7
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Without a bit of extra work, you won't be able to tell much without the output transistors. You can check all of the regulators and other supply inputs without the driver board in place. You should do that first.
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Old 19th September 2013, 06:44 PM   #8
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After testing all components of the driver board, I found out that surface mount transistor
Q10 is also shorter, it has printed MAX and 08 on small numbers on it, I think that 08 is for the manufactory year. But can not find the cross reference for that transistor.
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Old 20th September 2013, 04:06 AM   #9
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Hi perry babin, do you have a photo that includes Q10?
Thanks in advance.
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Old 20th September 2013, 04:19 AM   #10
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Ive used a 2sc3326 in Q10's location and the amp works fine
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