This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

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 Originals use 2 single opamps that are pretty hard to come by these days, so they've been replaced by a dual opamp.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.


13 comments:

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

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    1. 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

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  2. 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

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  3. Can you connect directly to a Cabinet?

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

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  5. cAN anyone help with adding mid control ?

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

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  7. 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.

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

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