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Tuesday, August 27, 2019

Boss FA-1 FET Amplifier

Originally a bit of a flop from Boss, the FET Amplifier was made famous by U2's The Edge. It features a 2-band Baxendall tone stack and the Volume control is more like a gain control. Originals use 2 single opamps that are pretty hard to come by these days, so they've been replaced by a dual opamp. Pots are board mounted and it should all fit in a 1590B.


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14 comments:

  1. mourningwoodAugust 27, 2019 at 12:35 PM

    The transistor is a jfet or can we use any fet ?

    ReplyDelete
    Replies
    1. skizoideAugust 27, 2019 at 2:22 PM

      J201

      Delete
    2. plushAugust 27, 2019 at 2:25 PM

      no, you must use N-channel Jfet
      original had 2sk246 inside forming a simple buffer
      but you can use j201, 2n5457 and other jfets to your taste

      Delete
  2. DrStevensonAugust 28, 2019 at 2:48 PM

    I bought this pedal for £10 in a bargain bin back in the 90s - still got it now. I actually did a stripboard version on my site but I separated the 2 opamps so people could experiment a bit

    ReplyDelete
  3. MiquelAugust 29, 2019 at 1:18 AM

    Can you connect directly to a Cabinet?

    ReplyDelete
  4. MiquelAugust 30, 2019 at 11:27 AM

    Hello???

    ReplyDelete
  5. Grupo16_IySOctober 30, 2019 at 6:16 PM

    Would it be a good choice to place it before a Class D Module?

    ReplyDelete
  6. Sveto389March 19, 2020 at 2:39 AM

    cAN anyone help with adding mid control ?

    ReplyDelete
  7. SlackJune 4, 2020 at 6:54 PM

    Can you hook a brother up with the schematic you used?

    ReplyDelete
  8. wainer.said@gmail.comJune 20, 2020 at 12:39 PM


    You can Mark as checked. It Works very well. I just changed the capacitor from 470NF to 47UF non-polarized. it sounds better that way.

    ReplyDelete
  9. pabloyorkeSeptember 4, 2020 at 8:15 PM

    verified! all stock components. k246(note the pinout) and lm1458. works very well!

    ReplyDelete
  10. GenJune 19, 2024 at 4:45 AM

    Does anyone have an idea to
    Modify this pedal for
    Bass guitar?

    ReplyDelete