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Old 30th April 2007, 09:02 AM   #51
spencer is offline spencer  Hong Kong
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OK got pins and put on and everything is working fine.
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Old 30th April 2007, 09:03 AM   #52
spencer is offline spencer  Hong Kong
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Some more photo of 5847 converter
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Old 30th April 2007, 09:04 AM   #53
spencer is offline spencer  Hong Kong
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more photo 2
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Old 30th April 2007, 09:06 AM   #54
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photo 3
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Old 30th April 2007, 09:07 AM   #55
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photo 4
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Old 2nd May 2007, 01:14 AM   #56
spencer is offline spencer  Hong Kong
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All the SM5847 chips have been sold out.

The sound for SM5847 is more harmonics while the SM5842 is thicker a bit in sound. Both sound good to me.

Thanks.
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Old 5th May 2007, 11:30 AM   #57
spencer is offline spencer  Hong Kong
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Shipped 10 boards and still pending 6 pcs for confirmation. Please contact me if I did not send a email to you.

Thus left 4 pcs ver2 boards for other diyer member.

Also, only limited parts available for those interested.

Also I would like to know if any one interested for a PCB with regulator and jfet IV (Single Ended design) only. I estimate the board will be priced at $5 each channel. This board will be great for CD player and DAC upgrade.

Thanks.
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Old 6th May 2007, 04:49 PM   #58
spencer is offline spencer  Hong Kong
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Update part list that still available.

All SM5847 chips have been sold out.

Thanks.
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Old 13th May 2007, 03:34 PM   #59
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Update: 13-May-2007

1. The output level at balance mode is about 4Vrms which is too high for my pre-amp (DIY jfet SE pre-amp). Thus I put a 4.7k resistor in parallel to R4, R13, R24, & R34 (solder at the bottom side of pcb). This has no effect to the sound but match the sound level of my pre-amp volume control. Due to this change, all the pot R1, R10, R21, % R31 has to be re-adjust till Point A back to 10Vdc (half of the +ve voltage 20V).
2. I change the 4 output BIG film cap from Vishay 4u7 back to Rifa PHE 426 10uF 250V type. I found the sound improves a lot and sonic is more sweet and relax (less harsh). Thus you should consider to invest on better capacitor at the output coupling.
3. I change the DF from 5847 and 5842 back and fore and find that the 5842 did sound better to me (more relax). No wonder VC America sell the 5842 so high. There is also sonic difference between 5842AP and 5842APT chip, APT is a bit better.
4. My original testing is using a China make 20VA transformer of 24V x 2. I put in the Farnell 9531750 30VA 25V x 2 potted transformer, the pre-regulated voltage is about 30.5V and is very stable. Sonic wide is more stable and sound is more relax also. Anyway I also recommend to use Farnell 9531718 30VA 9Vx 2 transformer.
5. I believe this DAC has lots of potential for diyer to play around to get and improve to better sound. One idea is to use DIR9001 receive IC instead of 8414. 9001 has only 50ps jitter and thus I believe the sound should improve more. I donít have this converter board yet and I may either build my own or buy one from China diy forum.
6. Thanks for all the support and I hope to receive more comment about this pcb. Thanks. Here is the update photo for reference.
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Old 14th May 2007, 07:39 AM   #60
spencer is offline spencer  Hong Kong
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A separate Jfet IV with super low noise regulator pcb is on sales in trade post. See link below.

http://www.diyaudio.com/forums/showt...hreadid=101874
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