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PW3B-LPF Open Source Musical Instrument Preamp

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    The PW3B-LPF bass preamp uses fairly standard bass and mid controls coupled with a variable resonance, swept frequency treble control format, with a separate control for each function. The latter part is often called a "filter" EQ in the bass world, which is a bit confusing to many techs and engineers since pretty much all EQ circuits are actually filter based. VRSFLPF is a bit of a mouthful though, so call it what you will. ;)

    Although this was originally intended for onboard instrument applications, DIY'ers have clearly chosen pedals as the preferred format, so most of my effort for the last few years has gone that way.

    The printed circuit boards will be available from a very reputable U.S.vendor, directly from the shared project section on their website. They sell in multiples of three, so many of us will likely end up with a test build, a "real' one, and one for a friend. Bills of Materials using one of the most popular U.S. vendors will also be done as shares on that vendor's website, and linked in the GitHub repository.


    The original version is now obsolete. The newer design v2 and v4 forks will be documented via this Github link:
    GitHub - Passinwind/PW3B-LPF

    Long Talkbass thread: https://www.talkbass.com/threads/the-passinwind-open-source-preamp.1259692/