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Thread: Swiss Army Synth Audio Board?

  1. #1
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    Swiss Army Synth Audio Board?

    The stand alone audio board and the prop shield are great, but...I'd love it if there was a board that had support infrastructure for all manner of audio projects, whether they be CV based, stomp box, or stand-alone instruments. Basically spots for the buffers, optoisolators, and DACs that accrue.

    Ideally it'd have pads to support (*=eurorack version concessions):

    • MIDI in and out, with optoisolator
    • Buffered audio in (ideally stereo)
    • Stereo audio out, with and without amplification
    • Connections for teensy ADC pins
    • Buffered inputs for ADC *that can handle CV voltage range
    • Buffered inputs for logic *that can handle typical gate voltages (up to 12V)
    • Connections for DAC pin
    • Dual outboard DAC *with op-amp for modular CV scaling (+/-5V or 0-10V)
    • micro SD slot
    • onboard memory
    • barrel and *eurorack power connectors


    One could argue that I should just switch over to the Axoloti, which has most of the I/O covered and a fairly slick GUI-to-finished-program process. OTOH: It's expensive in a per-board level and I like the control that the Teensy audio set-up offers.

    I have poked around for teensy based projects with PCBs, and the closest I found is a partial match that isn't available anymore. Anyone have pointers for a better match, a PCB they've tested, or interest in designing something along these lines, with or without the eurorack safety/compatibility considerations? I'll get around to designing something eventually, but 1) probably not before the next version of teensy comes out, and 2) not without a lot of painful iterating on my part (I'm a doctor, not an PCB designer). Bonus: If there was a standard board that people were working with, it would decrease noob mistakes and enforce best practices, just as the other audio boards have.

  2. #2
    Senior Member
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    Feb 2013
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    563
    Quote Originally Posted by drjohn View Post
    I have poked around for teensy based projects with PCBs, and the closest I found is a partial match that isn't available anymore. Anyone have pointers for a better match, a PCB they've tested, or interest in designing something along these lines, with or without the eurorack safety/compatibility considerations? I'll get around to designing something eventually, but 1) probably not before the next version of teensy comes out, and 2) not without a lot of painful iterating on my part (I'm a doctor, not an PCB designer). Bonus: If there was a standard board that people were working with, it would decrease noob mistakes and enforce best practices, just as the other audio boards have.
    fwiw, Paul seems to have had a vague plan along these lines.

    as for available PCBs, there's quite a few teensy-based eurorack modules, of course; ie if that's what you're after, but none that would cover every item on your list, AFAIK. for example (though i won't work on this until the next teensy comes around) i once made a small 6HP version of the audio adapter (+/- some details): https://github.com/mxmxmx/minitrash ; or https://github.com/mxmxmx/eurotrash_mkII (with display, but lacking audio inputs); useful up to a point, but in lots of cases dedicated hardware ( = designed for some specific purpose) ix the more desirable thing to have, imho.

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