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Thread: SL-1200 DC Power Supply DIY

  1. #1
    Join Date: Aug 2012

    Location: Denver, Colorado

    Posts: 452
    I'm Jim.

    Default SL-1200 DC Power Supply DIY

    This is my go at an external power supply for the SL-1200.

    My most sincere thanks for this thread, it was extremely useful in this process - http://theartofsound.net/forum/showt...chnics-SL-1200

    After a conversation with Wayne Colburn of Pass Labs, learning that he has made a SP-10 PSU for in-house use, a few things became apparent - Get the bridge diodes out of the TT and just have DC on the umbilical. Use 1N4007 diodes, for whatever reason they sound the best, even better than exotic high-speed diodes. Snub the bridge on the AC side with a .22uF film cap. Use multiple stages of RC filtering.

    The biggest improvement is of course, no transformer vibration on the platter, easily done merely by locating the transformer outboard of the TT chassis, and this is what I was originally planning to do - but converting umbilical to DC wasn't much more work.

    Does it sound good? Of course! And the best part is that I'm not even done yet, the stock regulator hasn't been replaced... (mainly because I ran out of time...)

    UPDATE - The first regulator modification can be found here --http://theartofsound.net/forum/showthread.php?26620-SL-1200-DC-Power-Supply-DIY&p=467311#post467311

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    The first thing to be done is remove the bridge diode and snubber caps.


    These were located in the holes now visible.


    An umbilical is added. The white 3rd wire is capped off, but still there if I need it for something in the future. The bare metal wire is the shield drain, to be attached to ground.


    Fused IEC plug, switch, microphone connectors used for the umbilical.


    All to be placed into this ABS enclosure.


    There is no reason not to use the stock transformer, it's the proper voltage, soft-mounted, has a beautiful mu-metal shield, and is free with the purchase of a turntable.


    (3) 4700uF 63V volt capacitors, (2) 10ohm 3W resistors, .1uF polypropylene bypass cap, all wired up in a CRCRC filter. Why those values? I had them on hand. If I needed to buy new, I would probably use similar values.


    And here it is with the bridge to the side. (The yellow is the transformer secondary.) The eagle-eyed among you will notice the 1K bleeder resistor across the cap bank.


    The final configuration of the umbilical attachment to the PCB. Of note the shield drain wire (the bare one) is not connected to anything at the PSU box. The shield is just at ground potential.


    The insides after the modification. I utilized the now unused AC power switch to switch the strobe.


    A few zip ties to attach the wire to the studs for strain relief, and of course the obligatory ferrite clamp.


    Schematic of the Power Supply.


    This is stage one of my PSU modifications, a different regulator of some sort will be next.

    Questions or comments warmly solicited.

    Thank you for looking.
    Last edited by The Grand Wazoo; 06-08-2013 at 17:24. Reason: Added Schematic

  2. #2
    Join Date: May 2010

    Location: Leixlip, Ireland

    Posts: 142
    I'm Martin.

    Default

    Nice job.
    Presumably the little blue PCB after the TX is a discrete bridge rectifier?
    Analogue: Technics SL1210 M5G, AN Arm One/II, Blue Angel Mantis MC
    Amps: Devialet 200
    Speakers: Usher Mini 2 Dancer DMD
    Cables: Supra, Mark Grant, Reference Fidelity
    DIY System Audiosector Gainclone, Salas DCB1, AudioSector MC Phono stage

  3. #3
    Join Date: Aug 2012

    Location: Denver, Colorado

    Posts: 452
    I'm Jim.

    Default

    Yes. It's from a PSU board from Peter Daniel / Audiosector.com . The board is upside-down, so a little hard to make out.

  4. #4
    MartinT Guest

    Default

    Nice work, Jim. I'm following this as it represents the most inexpensive and possibly biggest first jump for many potential Technics modders. Well done!

  5. #5
    Join Date: Aug 2010

    Location: London, UK

    Posts: 539
    I'm Francois.

    Default

    I take my hat off!
    This is indeed very very exciting.
    I shall follow this with great interest.
    Well done.
    If you are looking into bespoke voltage regulation, check my thread about the fidelity audio Spower...

    http://theartofsound.net/forum/showt...ics-SL1210-M3D

    Last edited by Frankyc2003; 03-07-2013 at 07:17.
    Francois, London, UK
    Source component/s:
    Cambridge Audio Azur 540C, Raspberry Pi 2 with IQ Audio DAC+ running Volumio, Lenco GL75 in original plinth, Audio Note Arm One, Technics SL1210 with external PSU (6L6 design) and Mike New bearing, Audiomods Mk IV with micrometer, Heybrook TT2, Jelco 750D, Tellurium Q Iridium, Home Brew TX1003 Based SUT, Sumiko BPS iii, Goldring 2200 MM, Audio Note IQ3 MM
    Amplification:
    Audion Silver Night 300B SE
    Loudspeakers:
    Fostex 206 Based Horn Speakers, Supertweeter from Bespoke, Tannoy LGM 12"
    Cables/stands:
    LAT SS1000 Mkii to speakers, silver litz between SUT and phonostage

  6. #6
    Join Date: Oct 2012

    Location: The Black Country

    Posts: 4,054
    I'm Alan.

    Default

    Good job Jim and thanks for the clear pictures for the benefit of others

    Alan
    Firebottle - for the no bottleneck approach.

    I love Hendrix for so many reasons. He was so much more than just a blues guitarist - he played damn well any kind of guitar he wanted. In fact I'm not sure if he even played the guitar - he played music. - Stevie Ray Vaughan

  7. #7
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

    Posts: 76,467
    I'm AudioAl'sArbiterForPISHANTO.

    Default

    Brilliant work, Jim! Many thanks for taking the time and effort to do this. Your work is reference quality and a credit to AoS. Well done

    Marco.
    http://www.thestainedglasscompany.com

    "A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do" -- Milan Kundera.

  8. #8
    Join Date: Aug 2012

    Location: Denver, Colorado

    Posts: 452
    I'm Jim.

    Default

    Marco, et all,

    Thanks for the kind comments. I really enjoy making the guides and have done quite a few at DIYaudio. A couple of my favorite -

    http://www.diyaudio.com/forums/pass-...amplifier.html

    http://www.diyaudio.com/forums/pass-...pearl-2-a.html

    Both of these projects are gobsmackingly good sounding. The F4 is an amp that would happily be my desert island piece, and the Pearl is so musical it belies description. I'm not one for writing buckets of audio prose, but both these are worthy of novels.

  9. #9
    Join Date: Apr 2011

    Location: Surrey

    Posts: 3,953
    I'm Mike.

    Default

    Quote Originally Posted by 6L6 View Post
    http://www.diyaudio.com/forums/pass-...amplifier.html

    http://www.diyaudio.com/forums/pass-...pearl-2-a.html

    Both of these projects are gobsmackingly good sounding. The F4 is an amp that would happily be my desert island piece, and the Pearl is so musical it belies description. I'm not one for writing buckets of audio prose, but both these are worthy of novels.
    Seriously impressive

    You thought of doing this for money ?

    and a dog for a Pic !
    Technics 1210, MCRU Linear PSU, Mike New Bearing & Platter, Stillpoints LP1 weight, Speedy Steve Ebony armboard, Fidelity Research FR64FX arm, Ortofon SPU. LP12/Aro/Lyra Dorian, Aurorasound VIDA Phono Pre Amp, Ortofon ST80SE SUT, Rega Isis CD, Marigo Labs Clear Transformation CD mat, Belles VT-01 MK II Pre Amp, Belles MB200 Mono Power Amps, TAD E1 speakers. Creaktiv racks, Mains Cables: Coherent, MCRU Ultimate, Interconnects : Coherent and Yannis 223.5 Connect Litz, TQ. Coherent speaker cable. Audio Magic Transcendence Conditioner. Coherent socket

    Mike

  10. #10
    MartinT Guest

    Default

    Wonderful guides, Jim.

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