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Old 30th May 2013, 07:07 PM   #481
farhun is offline farhun  United States
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Thanks Jackal29a, I have been very picky with proper decoupling when I built the boards, I have extra 10uF and 0.01uF caps parallel to the ones on the board, good quality electrolithics, nichicon and panasonic at both sides of the board!
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Old 30th May 2013, 11:01 PM   #482
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Quote:
Originally Posted by farhun View Post
I meant IV opamps, 6 LME49990s. I've build two boards, both have the same heat problem. What may cause that?

Worst are the last two opamps, they reach ~90-100 degrees Celcius. I have changed power supplies, built multi-stage regulated supply with independent Salas LV regulators for analog, digital, and IV stages, noisewise they are very clean and voltages are not exceeding the standards; 3.3V for digital, 3.45V for analog, and 12.2V for IV. I'm seriously puzzled.
How about current load ?
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Old 1st June 2013, 05:09 AM   #483
farhun is offline farhun  United States
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I believe IV opamps oscillating at high frequencies was it, using 0.1uF caps between +V and -V pins of each opamp considerably reduced the heat. Interesting. Thanks Jackal29a.
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Old 1st June 2013, 05:20 AM   #484
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Your're welcome, glad it got better. I'd still recommend you read page #10 of the LME's data sheet->output drive and stability, output compensation and supply bypassing. Output compensation paragraph mentions high speed data conversion.
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Old 23rd June 2013, 02:34 PM   #485
Flac is offline Flac  Netherlands
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Smile Wondering ...

having an epson x-tal of 75 MHz and feeding my DIYINHK via an Amanero I've played my 1st 384 track just to see if it would lock on to it and play in the end and YES ... it locked, loaded and played instantly although at the end of the track it started to generate a lot of digital noise but that disappeared and stayed away as soon as another track started to play/stop.

I got the impression those higher rates (here 18432 kbps, 384000 Hz in foobar) were only possible with a 100 MHz clock ... seems it works with 75 MHz as well ... and sounds really good as well ...
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Old 24th June 2013, 01:25 AM   #486
glt is offline glt  United States
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I've done those tests with BII 80 MHZ. 384K Material would play, but 352K will not play... (don't know why)
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Old 15th August 2013, 03:53 PM   #487
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I have a question: I bought old version AVCC and Trident regulators from TPA. I did not separate AVCCL and AVCCR as I am a newbie and I want to make sure the board works fine with default configuration. While AVCC regulator has two output but the board has one AVCC input, could you advise how should I wire AVCC regulator to the board? By using only one output or bridging the two outputs?
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Old 16th August 2013, 10:48 AM   #488
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None replies but I have another question. If I cut the trace on my rev5 board, I can use CN8 as AVCC_R. I saw only one voltage divider (10k/10k), does it mean only one channel's offset will be used for both channel? Schematic has two voltage dividers for Offset_L and Offset_R
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Old 9th October 2013, 02:32 PM   #489
Ryssen is offline Ryssen  Sweden
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If I wan´t to use voltage out and a transformer,can I just leave out the opamps and take the signal there,no other settings to be done?
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Old 6th January 2014, 11:58 AM   #490
voy is offline voy
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I ordered the wrong resistors for the second time now. The first time I selected 1/4 watt on mouser but you are still able to order 1/2 parts. I learned from my mistakes I tried again. But again I *!@#$% up. I now have 1/4 watt dale resistors but again the wrong format. They are 71-RN65 parts and they are too big. I used them anyway but it really doesn't look nice.
Why don't you stay in the RN61 range then? well a lot of them were not available so I bought the more expensive ones.
What would you do? leave them or spend another 20 euro's shipping + parts and try again?
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