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Old 2nd June 2007, 12:41 PM   #1791
Pocoyo is offline Pocoyo  Indonesia
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Default how many power output

for your product

- lm 3875 = ..... watt / channel
- lm 4780 = ..... watt / channel

that price for two channel ?

how about PSU ? are sale it too ?

thanks for your information
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Old 9th June 2007, 02:28 AM   #1792
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Received my package, everything looks perfect! Man the board looks 10X better in person than in photos. A VERY professional product and I am very happy with everything! Will post pics soon!
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Old 10th June 2007, 07:06 AM   #1793
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Default NOS DAC Premium Kit

Peter,

I have built the Premium NOS DAC kit and it has been running for about 5 hours. Reading peoples comments about this DAC did not prepare me for how it sounds in my system. It is the first time in using a digital source that I start to hear what I get from vinyl - and that is saying something!

My digital front end is QNAP TS101 320GB NAS feeding into a Squeezebox (SB3); after the DAC is a Promitheus TVC followed at the moment by an LM3875 Basic kit Gainclone (I did initially use the LM3886 but quickly changed to the 3875) into Spendor BC1s.

I am really looking forward to getting my Linkwitz Orions running with a set of gainclone amps but for the moment I am happy to listen to the system as it is and to hear how the DAC settles in.

Many Thanks

Alan
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Old 12th June 2007, 11:32 AM   #1794
orto is offline orto  United States
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Would a 330v toroid be overkill for a single paralleled lm4780? I managed to find two of them with 25+25. I'm trying to decide if I should use one for both channels or one for each.
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Old 12th June 2007, 03:51 PM   #1795
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330VA toroid will work fine per channel and won't be an overkill.
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Old 12th June 2007, 03:53 PM   #1796
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Here's an interesting device i put together recently. A customer who bough Patek had too much gain with the amp and asked me for an attenuator.

I made a simple adaptor, using Cardas hardware and nude Vishay, it came out really nice (and compact).
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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 13th June 2007, 02:45 PM   #1797
rabbitz is offline rabbitz  Australia
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Andrew Rothwell does some good in line attenuators. They also can make them to suit the attenuation you require.

http://www.rothwellaudioproducts.co....tenuators.html
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Old 24th June 2007, 05:47 AM   #1798
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Default Aargh ! DAC not working !

I finally started testing the DAC, but it's not making any music !!!

I started the tedious task of measuring the voltages on each of the ICs, and here are my results :

The only thing that doesn't seem right, is that on the schematic, pin 5 and 6 on the receiver got to pin 10 and 9 (respectively) is the CS8412, but on the board I've got, they go to 9 and 10 ...

There are no shorts on the SMD components, and I get 4V before the output capacitors (am using 0.47uF), and get 0V DC after.

Code:
SN75179      TDA1543
1: 5V        8V
2: 4.5V      2V
3: 4.5V      2V
4: 0V        0V
5: 5V        8V
6: 0.5V      4V
7: 2.3V      2V
8: 2.3V      4V

CS8412
1-3 : 2V
4-7 : 7V
8 :   2V
9 :   5V
10 :  0.5V
11 : 2V
12 : 7V
13 : 0V
14 : 2V
15 : 7V
16 - 19 : 0V
20 : 2V
21 : 0V
22 : 5V
23 : 0V
24 - 25 : 7V
26 - 27 : 2V
28 : 7V
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Old 24th June 2007, 06:18 AM   #1799
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It seems that the regulator supplying VD on the CS8412 is a 7V regulator (not a 5V one)!!!

Have I fried the chip ? (please say no !)
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Old 24th June 2007, 12:08 PM   #1800
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OK, found the problem (silly me).

Earlier I put a capacitor in the wrong place. Removing it left some solder closing the hole, which couldn't be removed, so I "scraped" it away, and put the correct cap in.

Now I realised that all that "scraping" removed the copper that joined the ground from top of the board to bottom. A wire jumper now connects the grounds, and the DAC is finally making music !

Albeit everything is connected with aligator clips ...

Sorry for spamming the board !
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