Build thread - building the Subbu DAC V3 SE - Page 11 - diyAudio
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Old 16th November 2013, 02:23 PM   #101
GaryB is offline GaryB  United States
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Default a new modification thread

I just opened up a new thread to discuss modifications of the Subbu V3 DAC. After discussion with JP, it was agreed that it's better to keep this thread focused on helping people with the BOM build of the V3 DAC. I want to assure everyone that the BOM results in a very good sounding DAC, especially the version with the SAL-RPM capacitors.

We can discuss changes from the BOM in the new thread here Modifying the Subbu V3 DAC

Thanks,
---Gary
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Old 16th November 2013, 03:13 PM   #102
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Quote:
Originally Posted by GaryB View Post
I just opened up a new thread to discuss modifications of the Subbu V3 DAC. After discussion with JP, it was agreed that it's better to keep this thread focused on helping people with the BOM build of the V3 DAC. I want to assure everyone that the BOM results in a very good sounding DAC, especially the version with the SAL-RPM capacitors.

We can discuss changes from the BOM in the new thread here Modifying the Subbu V3 DAC

Thanks,
---Gary
This is a great idea Gary, and many thanks for the reassurance regarding the stock DAC's performance.
I have 2 PCB's on order, so I will build one as per BOM and the other I can use for experiment and comparison using the new thread for guidance.

Cheers - Ken
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Old 17th November 2013, 01:37 AM   #103
Neville is offline Neville  United States
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Started soldering my PSU pcb and noticed that the B1 part number from Mouser is not correct - p/n 512-DF01S. I believe it should be p/n 625-2W01G-E4. Can somebody confirm this and is there an updated BOM?
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Old 17th November 2013, 08:32 AM   #104
atupi is online now atupi  Romania
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You are right. You should buy any thru hole rectififier bridge wich fit the pcb min 1A 50v.
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Old 17th November 2013, 12:33 PM   #105
Neville is offline Neville  United States
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Thx atupi...I'll start on the dac pcb and see if there is anything else I need to order but as long as the p/n are correct I should have everything else. it just dawned on me....do we need to order an rca/coax connector for input? is there anything different compared to regular rca input/outputs?

Can somebody explain the footnote of Q1? "** - Check the E/B/C depending on the transistor package you use as SOT-32 and TO-126 have different pin arrangement"
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Old 17th November 2013, 02:26 PM   #106
GaryB is offline GaryB  United States
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Quote:
Originally Posted by Neville View Post
....do we need to order an rca/coax connector for input? is there anything different compared to regular rca input/outputs?

Can somebody explain the footnote of Q1? "** - Check the E/B/C depending on the transistor package you use as SOT-32 and TO-126 have different pin arrangement"
You do need to get the SPDIF signal to the DAC. You could wire a cable directly to the board but that's not very convenient. Normally you'll add a connector. Even though RCA jacks are commonly used for SPDIF, I prefer to use BNC. The SPDIF signal chain is spec'd to be 75 ohm impedance and I've found that there is benefit in using 75 ohm coax for my digital interconnects and using BNC jacks and plugs spec'd for 75 ohms. But you only get the full benefit if you're willing to change the connectors on both sides - i.e. on both the DAC and the transport. If you want to go down this path, the Amphenol 112432 jack is a nice 75 ohm BNC connector that's available for a reasonable price at both Mouser and Digikey.

The footnote about EBC just says that the pin out of Q1 (BD140) is a function of the package so please check the datasheet and make sure you install it correctly.
---Gary
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Old 17th November 2013, 02:46 PM   #107
bcmbob is offline bcmbob  United States
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Here's a link to my attempt to have several inputs available. Different DAC but I use the BNC 90% of the time.

DAC Multi-Input.
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Old 17th November 2013, 05:29 PM   #108
atupi is online now atupi  Romania
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Quote:
Originally Posted by Neville View Post
Started soldering my PSU pcb and noticed that the B1 part number from Mouser is not correct - p/n 512-DF01S. I believe it should be p/n 625-2W01G-E4. Can somebody confirm this and is there an updated BOM?
I've ordered this bridge:

Mouser Part #:
625-2W04G-E4
Manufacturer Part #:
2W04G-E4/51

but anything similar will do, so no reason to order from Mouser.

Happy soldering,
Adrian
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Old 17th November 2013, 05:51 PM   #109
Neville is offline Neville  United States
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Quote:
Originally Posted by atupi View Post
I've ordered this bridge:

Mouser Part #:
625-2W04G-E4
Manufacturer Part #:
2W04G-E4/51

but anything similar will do, so no reason to order from Mouser.

Happy soldering,
Adrian
Atupi, I picked up NTE5305 at local store here.

Thx for the info and pics GaryB & bcmbob.. Hope to fire up the power supply by itself tonight.

btw I was really concerned about the small legs on the wmm804 and ess903 but I figured it out :

1. put liquid flux on the pads
2. wipe any excess off
3. place part on and align legs to pad
4. put solder on iron tip
5. put tip on one leg
6. apply liquid flux again on all legs
7. put solder on iron tip (little amount goes a long way) and place on legs
8. if you have any bridges just use wick.
9. check your work with a loupe or at least 4x magnification ... dependant on your vision I guess

Hope this helps.
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Old 18th November 2013, 01:37 AM   #110
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Default voltage regulators are now available from Mouser

U2, U3, U5 and U4 are available from Mouser. They're listed as "New Product". Catalog #'s are 998-MIC5205-3.3YM5TR and 998-MIC5205-3.6YM5T. Yay for those of us who prefer Mouser
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