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Thread: DCB1 trials

  1. #21
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,564
    I'm Oliver.

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    Quote Originally Posted by smangus View Post
    weird I thought all short leads were negative ? all polarity as per the board i think really. from memory +ve on the circle side and -ve on the flat side. Someone less numpty like will be along to confirm/deny shotly I imagine.

    Sent from my SM-G950F using Tapatalk
    The +ve and the -ve are the same on both the leds in the picture to check which way round you have them. Personally. I'd make sure I used the same LEDS all over. .

    Use the pic below to check
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Raspberry Pi 3+/Allo Boss 1.2/Isolator 1.3 & Firebottle LPSU with Volumio & JRiver
    Amplification: Nelson Pass Derived DCB1 with Khozmo 48 Step Series Attenuator & Neurochrome Modulus 686 Amplifier
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  2. #22
    Join Date: May 2017

    Location: West Sussex, UK

    Posts: 761
    I'm Steve.

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    Hi Dominic
    I said it would be the led.

    I'm still happy for you to pop over.
    I'll check everything else and i also have a set of
    Audio Note resistors here if you want to fit them,they make quite a difference.

    Look at position you fit led and check board marking not square or round hole mate.
    Simple mistake....

    Steve..
    Technics SP10 tt. Cart: At33ptg
    Project 2xperience sb dc
    Nelson Pass DCB1 pre
    Audio Research 75hd
    Aragon 4004 dual mono
    Monarchy Audio SM70
    CD Player: Cyrus cd8se
    Spotfire Speaker Cable
    Rogers Ls3/5a 15ohm
    Tannoy Eaton

  3. #23
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 35
    I'm Dominic.

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    Quote Originally Posted by Bigman80 View Post
    The +ve and the -ve are the same on both the leds in the picture to check which way round you have them. Personally. I'd make sure I used the same LEDS all over. .

    Use the pic below to check
    The photo of five LEDs look the right way round according to the picture, but the two clear-red LEDs measure the 'wrong' way round - ill swap them and see what happens. BTW I added the two clear-red because the total Vf measurement was getting too high with 5 orange LEDs.

  4. #24
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,564
    I'm Oliver.

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    Quote Originally Posted by Domg View Post
    The photo of five LEDs look the right way round according to the picture, but the two clear-red LEDs measure the 'wrong' way round - ill swap them and see what happens. BTW I added the two clear-red because the total Vf measurement was getting too high with 5 orange LEDs.
    How strange!

    Fair enough, adding the clear ones.. Makes sense.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Raspberry Pi 3+/Allo Boss 1.2/Isolator 1.3 & Firebottle LPSU with Volumio & JRiver
    Amplification: Nelson Pass Derived DCB1 with Khozmo 48 Step Series Attenuator & Neurochrome Modulus 686 Amplifier
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  5. #25
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 35
    I'm Dominic.

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    Quote Originally Posted by STD305M View Post
    Hi Dominic
    I said it would be the led.

    I'm still happy for you to pop over.
    I'll check everything else and i also have a set of
    Audio Note resistors here if you want to fit them,they make quite a difference.

    Look at position you fit led and check board marking not square or round hole mate.
    Simple mistake....

    Steve..
    Thanks Steve,
    I'd like to call round and have you 'cast your eye over' in any case. Ill get in touch when Ive had another try with the LEDs this weekend. I want to try with the Shinkoh and Riken before fitting Audionote resistors. Probably want to experiment with better caps too, obligato or Jantzen silver perhaps. Hope all went well with your dad.
    Dom

  6. #26
    Join Date: May 2017

    Location: West Sussex, UK

    Posts: 761
    I'm Steve.

    Default

    Hi Dominic
    Look forward to meeting you.
    He moves to the care home on Monday
    Technics SP10 tt. Cart: At33ptg
    Project 2xperience sb dc
    Nelson Pass DCB1 pre
    Audio Research 75hd
    Aragon 4004 dual mono
    Monarchy Audio SM70
    CD Player: Cyrus cd8se
    Spotfire Speaker Cable
    Rogers Ls3/5a 15ohm
    Tannoy Eaton

  7. #27
    Join Date: Dec 2010

    Location: North Lincs

    Posts: 137
    I'm Keith.

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    Check post 5836 might be relevant.

    https://www.diyaudio.com/forums/anal...build-584.html

  8. #28
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,564
    I'm Oliver.

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    To save work
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Raspberry Pi 3+/Allo Boss 1.2/Isolator 1.3 & Firebottle LPSU with Volumio & JRiver
    Amplification: Nelson Pass Derived DCB1 with Khozmo 48 Step Series Attenuator & Neurochrome Modulus 686 Amplifier
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  9. #29
    Join Date: Nov 2017

    Location: Godalming, Surrey, UK

    Posts: 35
    I'm Dominic.

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    Spun the critters and it seems to have done the trick! Ive learned that I don't like resoldering one more board to go *X@!!
    Some quick measurements on first board suggest its running at about 450mA and an extra 64Ohms in parallel is needed across one resistor to balance. Is this worth worrying about.
    +ve -ve
    Vout 9.61 9.57 V

    Vdiff across resistor 1.216 1.167 Volts
    R 2.7 2.7 Ohms
    I 450 432 mA
    Rbal req 2.59 Ohms
    R2 req 64.3 Ohms



    Still - chuffed to get it running - thanks for advice

  10. #30
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,564
    I'm Oliver.

    Default

    Quote Originally Posted by Domg View Post
    Spun the critters and it seems to have done the trick! Ive learned that I don't like resoldering one more board to go *X@!!
    Some quick measurements on first board suggest its running at about 450mA and an extra 64Ohms in parallel is needed across one resistor to balance. Is this worth worrying about.
    +ve-ve
    Vout9.619.57V

    Vdiff across resistor1.2161.167Volts
    R2.72.7Ohms
    I450432mA
    Rbal req2.59Ohms
    R2 req64.3Ohms



    Still - chuffed to get it running - thanks for advice
    Well done!

    I'd get it as close as possible, it would niggle me lol. IIRC we had to add a resistor to one channel to match it up on mine.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage (Telefunken Valves)
    Digital: Raspberry Pi 3+/Allo Boss 1.2/Isolator 1.3 & Firebottle LPSU with Volumio & JRiver
    Amplification: Nelson Pass Derived DCB1 with Khozmo 48 Step Series Attenuator & Neurochrome Modulus 686 Amplifier
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Pioneer CS-77A

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

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