DIY

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  • Boomstar Modular 3003 Filter DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    The 3003 filter is a voltage controlled, discrete analog 18 db/oct ladder low-pass filter, employing hand-matched transistors. Drop the FREQUENCY knob to 0 and things get pretty dull; swing it back up and those "Transistor Bass” highs come crashing through the gate. The 3003’s RESONANCE circuit at max will sing out more than the TB’s signature chirping in a fun, bubbly, if washy, poorer relation, Mini “clone-ish" way; use it tastefully, or throw moderation to the wind for overwhelming chirp force. More Information.

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    $45.00
  • Boomstar Modular 4075 Filter DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    The 4075 filter is a voltage controlled, discrete analog, 24/db/oct cascaded transconductance low-pass filter, employing hand-matched transistors. In its lowest FREQUENCY setting it shaves off higher frequency harmonics; its RESONANCE or “Q” circuit pushes those harmonics past the self-oscillation boiling point, projecting a thumpy, thrashing squeal, with explosive low to mid-range power and depth. The design is actually pulled from the four-pole ARP 4072 (better: more parts and trims), sans the 12kHz design flaw which hamstrung the original’s high end. More Information.

    (Not available for online sale in the UK and EU—please refer to our International Dealers List)
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    $45.00
  • Boomstar Modular 5089 Filter DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    The 5089 filter is a voltage controlled, discrete analog, 24 db/oct transistor ladder, low-pass filter, employing hand-matched transistors. Our ladder low-pass filter—a subtractive analog sound synthesis foundation—in its lowest FREQUENCY setting removes, or cuts off higher frequency harmonics; its RESONANCE or Q circuit emphasizes those harmonics to the point of “squealy,” giddy self-oscillation, tracking the keyboard in its FULL setting quite nicely if seeking an alternative sine wave. More Information.

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    $45.00
  • Boomstar Modular 8106 Filter
    Boomstar Modular 8106 Filter DIY
    BOM (PDF download), bare PCB, and front panel only. No parts included.

    Designer Tim Caswell: "The 8106 is a 6db/oct hi-pass filter followed by a recreation of the Roland® IR3109 module, which is a 4 pole, 24 db/oct voltage controlled lowpass filter with voltage controlled resonance. Three dual OTAs with similar topology to the BA662 used in the Jupiter 8 (and the IR3109 module) were employed, one amp for the hi-pass filter, four (with added buffers) for the low-pass, and one for the resonance. This filter takes a wide range of input signals, and tracks control voltage extremely well. Tap points are available for 6db, 12db, and 18db/oct. Although the topology is similar to the 4075, the tonality, especially when overdriven, is distinct..."

    More Information.
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    $45.00
  • Boomstar Modular Levels DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    LEVELS is a versatile, low-noise six channel summing mixer/attenuator for audio and CV, which can be used rather effectively in a variety of ways: 6 in 1 out, or two separate mixers: 4 in 1 out, and 2 in 1 out, e. g., when only jacked-in to MIX 5/6 output all input channels pass through; utilizing the 1-4 OUT removes channels 1-4 from the MIX 5/6 output. Handy indeed. More Information.

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    $32.50
  • Boomstar Modular SE88
    Boomstar Modular SE88 Filter DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    Our version of the boxy, Blade Runner-sweet and Boomstar-brash dual mode CS80 filter, initially married to the Omega Series Synths, and then tucked-in the 'Stars, now joins the Modstar Collective. We've twisted and turned the SE88 to unflatten the earth, so to speak; the original CS80 fed a HP filter into a LP filter, but with the SE88 your can select MODE 1's HP or BP to feed MODE 2's LP or BP, or patch it to reverse that pleasant path. The audio signal is completely controllable with input and output levels for each filter. Cherish and respect your filter's input gain stages, for a smooth yet often brassy sound—shed your mercy to strike hard for boiling, snarling bite, even to the blackout/cutout point; then and only then, uniquely blend mode settings for the filter family values you revere.
    More Information.

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    $50.00
  • Boomstar Modular SEM Filter DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    Our SEM is known as a 'Voltage Controlled State Variable Filter' because it provides simultaneous high pass, low pass, and band pass outputs, all with a 12 dB/oct slope. The notch is the inverse of the bandpass, achieved by summing the Low Pass and high pass outputs. This version is a combination of the original SEM filter and the newer design from the OBX, along with improvements by SE. More Information.

    (Not available for online sale in the UK and EU—please refer to our International Dealers List)
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    $45.00
  • Boomstar Modular Slim O
    Boomstar Modular Slimo DIY

    BOM (PDF download), bare PCB, and front panel only. No parts included.

    The SLIM O shares our beefy OSCILLATION sound engine, so it is every bit as gorgeously stable—and of course tracks pitch remarkably well—but is sensibly slimmed down to 8hp essentials, with no tonal or quality sacrifice allowed; the Slimo is MIDIMINI big sonically, with a three position octave switch for smart and easy octaving...

    More Information.

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    $40.00
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