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Old 22nd January 2009, 01:32 PM   #461
westers151 is offline westers151  United Kingdom
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Got my spare chip today and have wired it up properly and sat here listening to it.

Conclusions: For a non "power" amp it has got a lot of drive, but then again I have two speakers working and not just one so I always expected for the volume to be set lower.

The bass has come back to me and it's less bright now, but again that's not surprising as I had 12A going to just the one channel until today (two 6A secondaries), and I always wondered if the greater ampage was making it too bright.

The sound is nice and warm too.

Next steps: Listen to this like it is for a couple of weeks and then build myself a pre-amp as per Nuuk's site and see what difference that makes.
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Old 24th January 2009, 01:56 PM   #462
raypalmer is offline raypalmer  Canada
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Okay, I swapped out my bridge for the spare one and re-filed the tips of my secondary wires. I think I've got that licked. Although the DC voltage coming out seems high....

What really bugs me is that my LED still won't work!!! Is it possible to cook the led while soldering it's points? Should I try ordering up a fresh one?
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Old 24th January 2009, 02:34 PM   #463
AndrewT is offline AndrewT  Scotland
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LED back to front will destroy it. It is not a good diode for blocking DC.
Too much current will destroy it.
Too little voltage will not turn it on. It must be forward biased and expect between 1.5V to 2.0V across it when lit.
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Old 24th January 2009, 03:08 PM   #464
raypalmer is offline raypalmer  Canada
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I've got it running off a 22.1k resistor in r3. But I had a 680R in before, which was a mistake. Probably killed the led eh.
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Old 25th January 2009, 05:46 PM   #465
westers151 is offline westers151  United Kingdom
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Default Grounding?

Quick question. Is the Input Signal ground a completely seperate ground from all the other grounds (including the chip ground) - i.e no physical connection between the two?

If so, why?

And if it isn't seperate then why not just connect the input ground directly to the star ground?
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Old 25th January 2009, 06:06 PM   #466
Peter Daniel is offline Peter Daniel  Canada
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All grounds are connected together, they must be connected together. However, in my setups, the star ground is for power ground only and I prefer to keep signal ground separately, that's why the wires from RCAs (or potentiometer) connect directly to amp board and not to power star ground.
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Old 25th January 2009, 06:10 PM   #467
westers151 is offline westers151  United Kingdom
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Ok, so presumably there is a connection between SG and OG on the PCB?
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Old 25th January 2009, 06:25 PM   #468
Peter Daniel is offline Peter Daniel  Canada
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Yes, it is:
Attached Images
File Type: jpg lm3875_se_pcb.jpg (11.5 KB, 1210 views)
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Old 25th January 2009, 06:30 PM   #469
westers151 is offline westers151  United Kingdom
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Ok, I see.

So why did you prefer to have a seperate input for SG ?
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Old 25th January 2009, 06:56 PM   #470
Peter Daniel is offline Peter Daniel  Canada
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I don't know if I prefer it, but people 'who know' kept saying this is the way it's supposed to be done. There were long discussions on a subject when I was coming up with a final layout.
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