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Thread: Balanced DCB1

  1. #1
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 42
    I'm Dominic.

    Default Balanced DCB1

    Covid confinement has at least given me time to get on with projects that have languished in cupboards for a while. The dcb1 is working in balanced mode for the first time this morning and thankfully without any ground hum issues. Still quite a lot to sort out - some tricky metalwork for the volume display/controller and I still need to figure out the best way to get a 5V power supply inside the box (any suggestions? This is only my second build).
    https://imgur.com/gallery/EcvOZWf
    Last edited by Domg; 04-04-2020 at 13:27.

  2. #2
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 27,514
    I'm Martin.

    Default

    Separate box for the power supply?
    Current Lash Up:

    *Oppo BDT-101CI* Nelson Pass DCB1 / Krell KSA100 mkII * JM Lab Electra 926 *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

  3. #3
    Join Date: May 2008

    Location: Surrey

    Posts: 6,443
    I'm Rob.

    Default

    Stonking build there Dominic. I really like the enclosure. I can only access one pic from the Imgur link and it is difficult to see what sort of power supply you already have in there. I don't know if you ever heard of the Teddy Pardo Teddy Regs and Power Regs that were the rage about 10 years ago. There is info on the PFM forum.

    I mention these only that as a result of enforced confinement I have been playing with these for the first time since I built them. I have just added a Power Reg to a DIY ClassD amp and the results are very impressive. The Teddy Reg (not Power) were for Dacs, Preamps and other less demanding stuff.
    Buy Bose...And get your parking validated!.

    https://youtu.be/ZCBe7-6rw4M

    Friedrich Klappernost Extrovert Monoblocks, Acertum Triono 3 Speakers, Audio Mezzanine II Dac, Deo 2 NOS Dac, Vinyl Finyl TT with Scutt III Arm and Hiroko Plectrum Advanced MC Cart, Electro Wizard MC step-up, Twisted Phrame Super Balanced Interconnects, Dreadnought 7 speakers cables, Plattform Essential Isolation supports, Spectrum Definitive Flotilla Racks.

  4. #4
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 42
    I'm Dominic.

    Default

    Separate batteries just now, but as 5V DC PS only needed for volume control and display I’d like to include it in the enclosure. The traffos step down to 12V AC - not sure if I could step down from these to 5VDC or if it’s best to keep supplies separate.

  5. #5
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 42
    I'm Dominic.

    Default

    Tricky metalwork completed over last couple of days. Just the internal power supply for the display still to do.
    https://imgur.com/user/hanoidom

  6. #6
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 42
    I'm Dominic.

    Default






  7. #7
    Join Date: Sep 2013

    Location: s.wales

    Posts: 69
    I'm george.

    Default

    awesome looking build, what was the incentive to go balanced?
    i have the same board running SE, with a relay stepped attenuator,
    if it's for non audio and low power, i use these, https://cpc.farnell.com/myrra/47152/...reg/dp/TF01429
    you can get regulated and un-reg,
    tiny, and direct mains to 5V DC,
    great for control as they are so neat and self contained,
    i just solder it to veroboard, and use the verobaord to mount the take off pins and mounting points.
    they seem well made with no spurious interference etc. i guess a bit of copper tape over the top wouldn't hurt, or even a transformer can, but i'm using some without and no issues at all.

  8. #8
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 27,514
    I'm Martin.

    Default

    That is amazing, love the resistors on the volume pot.
    Current Lash Up:

    *Oppo BDT-101CI* Nelson Pass DCB1 / Krell KSA100 mkII * JM Lab Electra 926 *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

  9. #9
    Join Date: Apr 2016

    Location: Gravesend and France

    Posts: 1,402
    I'm paul.

    Default

    Looks very smart....what is it?
    Bakoon 11R Denon DP80 Stax UA-70 Shure Ultra 500 in a Martin Bastin body with jico stylus, project ds2 digital Lii audio crystal 10 tqwt speakers

    Office system, DIY CSS fullrange speakers with aurum cantus G2 ribbons Najda dsp as dac Akai AM-U02 Jvc QL-A51 direct drive turntable
    leema sub. JVC Z4S cart is in the house

    Garage system another Sony receiver, cassette deck


    System components are subject to change without warning and at the discretion of the owner.

  10. #10
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 27,514
    I'm Martin.

    Default

    A preamplifier.
    Current Lash Up:

    *Oppo BDT-101CI* Nelson Pass DCB1 / Krell KSA100 mkII * JM Lab Electra 926 *


    'You fool! To think that your ape-brain could contain the full knowledge of the Krell!'

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