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Old 12th October 2016, 11:34 PM   #1
Tea-Bag is offline Tea-Bag  United States
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Default GB For Salas DCG-3 and DCSTB Power Supplies

This is the official GB thread for the DCG-3 and DCSTB Power supply boards.

The DCG-3 is a JFET and MOSFET, 2 stage-single ended preamplifier/headphone amp
The preamplifier uses a DC Servo and three MOSFETs, hence the name DCG-3.

Click the image to open in full size.

There is also simple series DC stabilizer designed to compliment the circuit. It is called the DCSTB board. It is of mirrored Configuration and is sized to fit in same width footprint as the preamplifier board. A BIB SSLV1.1 board or other regulator can be used as well, if you know how to set to 17.5V recommended voltage as well.

Click the image to open in full size.

The main construction thread is located below. Most technical questions should be approached there.

Salas DCG3 preamp (line & headphone)

For selling and delivery purposes, this thread will do.

The costs for the DCG-3 board is 20.00, and 25.00 for the DCSTB Power supply.
Click the image to open in full size.
Additionally, Transistor kits are available for components that need matching and can be seen in detail in the later part of the my kit blog

http://www.diyaudio.com/forums/blogs...full-kits.html

Here is a picture of my prototype running.
Click the image to open in full size.

Board sizes are
DCG-3 -160x50mm
DCSTB- 160x106mm

The sign up sheet is in my signature for these boards, and are located on the right of the spreadsheet. Once enough boards are in demand, I will post the GB close date on this thread and in my signature. You should also receive a private message if you have signed up on the thread.
Attached Files
File Type: pdf BOM-SCH-GUIDE_DCG3-DCSTB.pdf (785.3 KB, 588 views)
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Last edited by Tea-Bag; 7th November 2016 at 04:29 PM.
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Old 13th October 2016, 02:44 AM   #2
bk856er is online now bk856er  United States
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Sweet!

BK
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Old 13th October 2016, 07:00 AM   #3
JimT is offline JimT  Canada
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For the DCSTB Full kit (No board, includes trans.) per side $40, do I need to order one, or two for the board?

Jim
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Old 13th October 2016, 09:36 AM   #4
Marra is offline Marra  United Kingdom
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I'm in for both boards.
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Old 13th October 2016, 11:17 AM   #5
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally Posted by JimT View Post
For the DCSTB Full kit (No board, includes trans.) per side $40, do I need to order one, or two for the board?

Jim
You need to order two of them. I did this to keep the costs in check, as it is substantially more money to build a fully loaded dual mono setup in both transformers and parts. The heatsinks are painfully expensive to ship and caps, and so some of that is reflected in the shipping.

I will need a consensus if people plan to build using dual mono or one PS, if it's one power supply, in the final throws of the GB, I will need to change the fuses and diodes. They both costs a bit more. Still figuring that point out.
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Old 13th October 2016, 12:37 PM   #6
Tea-Bag is offline Tea-Bag  United States
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????

Would you guys prefer TO-220 MSRF860G for all diodes? It will be needed for using one DCSTB to run a DCG-3. It's easier to stock, and but cost doubles for the diodes. If everyone runs dual mono, then diode and fuse stock needed can be minimized. Let me know
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Old 13th October 2016, 02:01 PM   #7
JimT is offline JimT  Canada
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Whatever makes it better for you.

Your work helps me an enormous amount and saves me money. I don't make those oops ordering mistakes and only have to pay one shipping and customs fee.

Thanks
Jim
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Old 13th October 2016, 05:09 PM   #8
JimT is offline JimT  Canada
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Forgot the most important reasons for buying your Group Buy kits. You make better parts choices than I do. I always learn from your kits. I also end up completing the project in a reasonable time as you have sent me the hard to get parts. Some of my projects wait forever. Too many times I have needed to order one more part but can't bring myself to make a $5 order and pay for shipping and customs on top.

What ever works best for you.

Jim
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Old 14th October 2016, 09:48 AM   #9
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Signed up.
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Old 14th October 2016, 05:58 PM   #10
JimT is offline JimT  Canada
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Tea,

I already have an In-Select board that will go in this preamp but am wondering if I need to be extra careful with transformer choice for the In-Select relays. Don't want it spreading hum around. What do you recommend?

Jim
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