Friday, 20 November 2020

Boss FA-1 FET Amplifier

 Slightly modified, subbing the two single op amps of the original to a dual. 1458 or 4558 should match the spec of the original ones.



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5 comments:

  1. lostintime1 January 2021 at 23:34

    Verified with 2SK30 & 4558. Love the sound, keeper for sure!

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    1. fuzzhead2 January 2021 at 04:45

      Thanks a lot! Tagged.

      Delete
    2. Mr.Baiser29 August 2023 at 13:59

      What low current alternative to the 4558 works best in this circuit? I wanna use it inside a guitar, with 18V supply from two batteries.

      Delete
  2. Miguel3414 October 2024 at 13:18

    A bit late, but anyway... I'm building this one, but I'd like to try a mod. Has anyone put clipping diodes in the feedback loop? In such case, does it sound good?

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    Replies
    1. Chris Stelloh15 October 2024 at 00:32

      The madbean Fireaxe is a modded version of this circuit. There are three 1n914 clipping diodes (asymmetrical?) on the 1st op amp stage, as well as a master volume and some other tweaks: https://madbeanpedals.com/projects/_folders/DistBoostOD/schematics/Fireaxe.gif

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