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Old 15th November 2008, 12:26 AM   #301
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Yes, you can connect the speakers and the source.

You can connect heatsink to Earth ground (isolate the LM1875 chips)
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Old 15th November 2008, 05:43 AM   #302
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Quote:
Originally posted by Peter Daniel
Check the fuse.
Thanks. Some mothers do have them...

Measuring the power supply without the amp boards connected, both measure approx 25VDC across both pos and neg.

Voltage at the wall is approx 216VAC

Now I have connected the amp boards, both amps read approx 29V and 33V across positive and negative respectively.

The chip gets pretty hot pretty quickly. I have changed the pcu heatsinks for pieces of aluminium sheet measuring 4" x 8" x 1/8" which hopefully will dissipate heat better.


Tested amps through two four ohm speakers from a pc speaker system using ipod as a source. Barely audible badly distorted sound from both amps. What to check next?

Thanks as usual

Matt
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Old 15th November 2008, 06:03 AM   #303
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Are you sure you didn't mixed up resistors on amp PCBs?
The values should be according to schematic here: http://www.diyaudio.com/forums/attac...amp=1210693738
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Old 15th November 2008, 02:29 PM   #304
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Can I really hear the difference between the Premium LM3875 and Classic LM3875 Kit?
I mean, they are the same but use different (pricy) components.

And what about their PCB used with "common" components? Would such a version be a bad expierence?
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Old 15th November 2008, 02:38 PM   #305
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Only you can answer that: some people hear the difference, some not. When in doubt, I usually recommend to start with standard components and upgrade later, when you feel it might be worth it

What do you mean by 'PCB version with "common" components'?
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Old 15th November 2008, 05:32 PM   #306
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I mean ordering the PCB only, and filling
it with standard components.
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Old 15th November 2008, 05:55 PM   #307
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That should work too.
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Old 15th November 2008, 09:52 PM   #308
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Well, to be honest I have more faith in your kit. And it saves me time and shopping for the right parts.

Anyway, I ordered your classic kit this afternoon (Wester-Europe time) and hope I can build this beauty soon. :-D
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Old 16th November 2008, 04:18 PM   #309
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My first chipamp works and sounds fine. Thank you to everybody, it should be impossible without the help of this thread

Renato
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Old 16th November 2008, 10:28 PM   #310
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About the transformer. What is the minimum VA (Watt) and minimum/maximum Volt?
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