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Old 21st August 2006, 08:26 PM   #1401
lohk is offline lohk  Europe
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Paolo,

do you have two or four bridges?
If only two, maybe your transformers are connected wrongly (out of phase).
If you have four bridges and no other connections to the transformer you must check and double check ALL your connections and the PCB. Believe me, there is always room for faults and mistakes. Did you check out all voltages, offset etc.?
Hum and noise always means wrong or missing connections. If you sound is low and muddy, maybe the connections to your soundcard is loose. If you read the provided manual carefully nothing shoud go wrong at the end of the day.
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Old 21st August 2006, 10:21 PM   #1402
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I have the premium kit with two rectifier boards. Toroids out of fase? They have 2 brown wires for mains and 2 blacks and 2 whites for secondaries, no other indication.

Paulo, the newbie
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Old 22nd August 2006, 12:06 AM   #1403
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Did you measure all voltages?
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Old 22nd August 2006, 08:23 AM   #1404
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Peter, I know that this is not the most appropriate place to post this, and I'm sure that you don't like being asked this but i figure this is better than clogging your e-mail...

are the lm4780 kits in stock?

Thanks a ton!
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Old 22nd August 2006, 08:07 PM   #1405
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Everything is in stock.
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“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
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Old 22nd August 2006, 11:05 PM   #1406
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If I am going to use the 4780 kit in parallel, meaning one chip in parallel per channel, how big of a transformer should I use, and what voltage secondaries would you suggest? (they will be powering a pair of 4 ohm speakers)
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Old 23rd August 2006, 12:48 AM   #1407
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I'm using 300VA, 2 x 22V AC toroids.
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Old 23rd August 2006, 01:08 AM   #1408
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Do you mean one for each chip? Will 22v secondaries provide the most power or should I go with higher voltage secondaries?
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Old 23rd August 2006, 02:55 AM   #1409
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Preferrably one for each chip.

You can go with 2 x 25V transformer if you need more power, check page 13 of the datasheet for more info: http://cache.national.com/ds/LM/LM4780.pdf
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Old 24th August 2006, 05:42 AM   #1410
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According to the data sheet using 35 volt secondaries will provide the most power. Are the published voltages before or after rectification? IF they are after, what voltage secondaries will give these or near these voltages after rectification?
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