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Hi there, welcome to my blog - La Revolution Deux. It's an odd name - but I like it! Here you will find all the info on my various DIY Guitar effects builds, amplifiers and guitars. Everything from a humble Ibanez tubescreamer to the holiest KLON Overdrive.

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Sunday, 5 March 2017

Friedman - Brown Eye 100 BE-100


Check this schematic out for the critically acclaimed (and very popular with big stage acts!) Friedman BE-100.

It's a fairly standard hot-rodded Marshall design with a few interesting twists - the "Sat" clipping control off the cathode follower and the FX loop design (which I believe is the MetroAmps loop design).

Also check out the way the global negative feedback is applied - it's level changes depending on which impedance tap the amp is set to output to. This could be intentional OR it could be a layout error. I've checked this on a real BE-100 and it is actually wired like that!

8 comments:

  1. So if you select the 4 ohm tap you get less? Can you safely run that into an 8 ohm cab?

    ReplyDelete
  2. hi, do you have the schematic of the zvex lo-fi loop junky ?

    ReplyDelete
  3. Fred, do you have a bigger version of the schematic? I can't read anything...

    ReplyDelete
    Replies
    1. Roseblood11, i believe the link to the schematic is here
      http://schems.com/bmampscom/freidman/BE100%20-V2%20REV1.5.png

      Delete
  4. Nice. Hey friend, please, could you help me? I have two questions:
    1) The schematic was verified? In the pictures of the Metroamp fx loop sold on internet i see at least 5 diodes;
    2) Do you know the specs of the transformers and the choke?
    Thanks a lot!
    Ricardo from Brazil

    ReplyDelete
  5. Have you ever thought about creating an ebook or
    guest authoring on other blogs? I have a blog based on the same information you discuss and would love to have you share some
    stories/information. I know my visitors would appreciate your work.

    If you're even remotely interested, feel free to send me an e mail.

    ReplyDelete
  6. The FX-Loop will not work if you use a mono plug at the receive jack cause you'll get a short cut at the send jack.
    Cut the connection between SEND and stereo jack pin R.
    Connect the switch contact of the send jack with the pin R of the stereo jack.

    ReplyDelete
  7. Hello, let's shake this thread alive:-)
    I'm planning to build after this schematic. I have one question, why is V1B's cathod capacitor a Electrolyth?
    cheers
    Kristian

    ReplyDelete

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