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Old 9th April 2010, 07:45 PM   #1
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Thumbs down Newb DIY DAC kit questions

Good day, everyone.

After repairing some vintage audio, I want to dive deeper.

It has been a long time since I actually played with electronic kits for fun. Years of avionics repair sort of took the fun out of doing it in my off time. But now I am really getting into it again.

I have a JVC XL-V33 CD player I re-belted. works fine, but it is a first or second gen player with single PCM56P DAC. I picked up the DAC kit with the Crystal chips CS8416 as digital receiver and CS4397 as DAC. Supposedly the new DAC is an improvement in music reproduction.

The JVC uses Yamaha YM3613B DIR and NPC SM5807EP DIF to feed the Burr Brown PCM56P.

The kit has an RCA and TOSlink input and is compatible with SPIDF. Came with power supply.

Questions-

1. Will the output from the JVC digital chips be readable by the crystal chips? does not look like it uses SPDIF.

2. If it will read it- where do I pick off the signal? 16bit serial into the DIR? Dig out from DIF?

3. Will I need to put in some kind of equalization circuit- like a 75ohm resistor and inline cap? I will use very small coax line I have left over from work. Not sure of it's rated impedance.


Any and all advice appreciated.

Jim L.
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Old 10th April 2010, 01:48 AM   #2
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Join Date: Oct 2005
Location: Central Florida
Quote:
Originally Posted by Fasterdamnit View Post
Good day, everyone.

After repairing some vintage audio, I want to dive deeper.

It has been a long time since I actually played with electronic kits for fun. Years of avionics repair sort of took the fun out of doing it in my off time. But now I am really getting into it again.

I have a JVC XL-V33 CD player I re-belted. works fine, but it is a first or second gen player with single PCM56P DAC. I picked up the DAC kit with the Crystal chips CS8416 as digital receiver and CS4397 as DAC. Supposedly the new DAC is an improvement in music reproduction.

The JVC uses Yamaha YM3613B DIR and NPC SM5807EP DIF to feed the Burr Brown PCM56P.

The kit has an RCA and TOSlink input and is compatible with SPIDF. Came with power supply.

Questions-

1. Will the output from the JVC digital chips be readable by the crystal chips? does not look like it uses SPDIF.

2. If it will read it- where do I pick off the signal? 16bit serial into the DIR? Dig out from DIF?

3. Will I need to put in some kind of equalization circuit- like a 75ohm resistor and inline cap? I will use very small coax line I have left over from work. Not sure of it's rated impedance.


Any and all advice appreciated.

Jim L.
Pin 7 is the SPDIF out. I tried to attach a pdf.
Attached Files
File Type: pdf 3613b.pdf (71.4 KB, 78 views)
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Old 10th April 2010, 03:26 AM   #3
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Outstanding! Thank you.
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Old 10th April 2010, 05:32 AM   #4
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It sounds great but I need to attenuate the output signal from the DAC board, pair of Burr Brown OPA637's for final output. Suggestions welcome.
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Old 11th April 2010, 04:10 PM   #5
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Location: Central Florida
Lower the gain of the output circuit, if it has any.

Or use a simple voltage divider.

Last edited by Bill Fuss; 11th April 2010 at 04:12 PM.
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Old 11th April 2010, 06:10 PM   #6
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As it is a surface mount board, I like the idea of an external divider as long as it doesn't affect the sound quality.
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