First Watt B1 clone - diyAudio
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I returned to DIY electronics in 2009 after a 20 year pause by building a few kits to get in shape. This blog is for me to keep track of my progress.
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First Watt B1 clone

Posted 12th August 2010 at 07:19 PM by alexcp
Updated 11th February 2017 at 02:16 PM by alexcp (Added photos)

What to say... B1 is a great design by Nelson Pass. Easy to build, absolutely transparent to the sound, compact, PCBs are available. I built one, using Nelson Pass' gerbers for making my own PCB, in an enclosure from (which sadly seems to be defunct now). The big blue film caps are 10uF Evox Rifa PHE426.

Update: I added a relay input selector, which reduced crosstalk between inputs. I also built another B1 clone (the last three photos), in an enclosure 1U (40mm) high.
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Attached Files
File Type: pdf B1 Buffer Preamp.pdf (273.8 KB, 182 views)
File Type: zip B1 R0 DIY GERBERS.ZIP (423.6 KB, 62 views)
File Type: zip (131.7 KB, 20 views)
Posted in Preamps
Views 6164 Comments 4
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Total Comments 4


  1. Old Comment
    marc brown's Avatar
    Nice B1! Where did you source your relay selector?
    Posted 18th April 2016 at 09:13 PM by marc brown marc brown is offline
  2. Old Comment
    alexcp's Avatar
    Hi Marc, sorry I was away from diyAudio for a few months. Thank you for the positive comment. To your question, I did not source the relay selector but designed and built it myself - there is not much to design there, so it was mostly soldering.
    Posted 30th July 2016 at 02:43 AM by alexcp alexcp is offline
  3. Old Comment
    marc brown's Avatar
    Do you happen to have the gerber files for your relay selector? It looks like you used Omron G6K-2P relays.
    Posted 25th October 2016 at 07:49 PM by marc brown marc brown is offline
  4. Old Comment
    alexcp's Avatar
    Marc, apologies again as I am not getting any faster... I am attaching the Eagle project, PDFs with the schematic and the board, and the gerber files.
    Posted 11th February 2017 at 02:14 PM by alexcp alexcp is offline
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