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Mezmerize DCB1 Building Thread
Mezmerize DCB1 Building Thread
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Old 6th August 2017, 06:54 PM   #1921
peafarmer is offline peafarmer  United States
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Thanks, Salas. I'll start building then. Andy
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Old 6th August 2017, 07:17 PM   #1922
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
Good luck and let us know.
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Old 11th August 2017, 12:56 PM   #1923
brookhart995 is offline brookhart995  United States
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Default Getting Ready

I am about to start my Mesmerize preamp build and had a couple of questions before I start ordering parts.
-I ordered the PCB from the DIY parts store. I assume I should follow the BOM listed below the PCB using the link on the product page?
-Concerning the listed relays, I only need to use as many relays as I plan on having inputs, correct? I am in the U.S. and typically order my parts from Mouser, the parts listed on the BOM are NLA, what current relays could be be used as replacements?
-What's the difference from using 5V or 12V relays?
-what's the recommended size of transformer? Would a 50VA 2X 12V work? Or should I get something different? Using a dual output transformer, do I twist the middle pair together to fit in the three inputs for power?
-Do I need to use a PSU or do you just wire the transformer straight to the board?

Sorry for all the questions, I would appreciate any input you can provide to help me out as I'm kind of new to DIY.
I plan on using this with a DIY Aleph J and possibly a LM3886 amp.
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Old 11th August 2017, 01:19 PM   #1924
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
As many relays as many inputs you need

NEC EA2-12NJ (Mouser has it in stock)

12V ones are less of a burden for the chip regulator in mA and they do not need the extra dropping resistors

50VA 15-0-15 is even better. Yes you create a midpoint if its a four wire double secondary trafo

Straight to the board. DCB1 has its own rectification bridge, reservoirs, shunt regulators, on board.
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Old 11th August 2017, 02:36 PM   #1925
brookhart995 is offline brookhart995  United States
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Great, thanks for the fast reply. I will try and post some pictures as I get going here in the next few weeks.
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Old 11th August 2017, 02:41 PM   #1926
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
Good luck and don't hesitate to ask as you go along.
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Old 11th August 2017, 04:52 PM   #1927
brookhart995 is offline brookhart995  United States
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What is a suitable replacement for the Toshiba 2SK170 BLF as they are no longer in stock?

Thank you
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Old 11th August 2017, 05:32 PM   #1928
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
Nothing except LSK170 B Grade from Linear Systems that you must find four in matched IDSS also. I haven't seen them offered as such lately. There are two guys on ebay who offer matched quads Toshiba 2SK170BL. Their feedback is 100% and comments say they are genuine. One is from Germany the other is from Israel. Maybe you can ask them for the rest of 2SK170BL too but in random picks since they not need be same IDSS.
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Old 11th August 2017, 09:46 PM   #1929
dbis is offline dbis  United States
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Hey guys,

I got mine from Spencer at fetaudio.com. That was after Salas helped me identify some fake ones I'd ordered from what was supposed to be a reliable source.

Hey brookhart995, the DCB1 was my first non-kit project. Thanks to help from Salas and others on this thread I got it done and it sounds great. Just search for "dbis" on this thread and you'll see some of the questions I had. Might help you out. Anyway feel free to ask any questions along the way. I'm still a newbie but I'll try to answer to the best of my ability. Good luck!

BTW, since the Mezmerize, I've built an F5 amp, working on Sony Vfet amp, and I've got Salas's new preamp and folded simplistic phono preamp kits waiting in boxes to be built.
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Old 12th August 2017, 04:42 AM   #1930
Salas is online now Salas  Greece
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Mezmerize DCB1 Building Thread
Correct, I forgot to mention Spencer this time. Thanks for mentioning.

You got quite busy with DIY since the Mez I see. That's nice.
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