362e1fa968
Power: standardise the whole family on a single USB-C input — drop the Micro's 2×AA and the Stage's 9V DC pedal jack (+ buck/reverse-polarity). Bring a power bank; nothing internal to wear out. BOMs updated (Micro ≈$35, Stage ≈$56) and all copy/cards/READMEs follow. Micro form: detach the two end caps from the body with a gap (set-back, darker end faces) so the TRS/USB-C jacks read as being on the ENDS of the bar, not the front panel. Landing: add a Philosophy section — "program on the web, play on any device" (author once → load the program string into whichever form factor fits) and "USB-C power everywhere — no batteries" (future-proofing rationale). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
118 lines
8 KiB
HTML
118 lines
8 KiB
HTML
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<meta charset="UTF-8" />
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<title>PM‑µ Micro — info & BOM — VARASYS</title>
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<a class="brand" href="/" title="VARASYS — Simplifying Complexity">
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<span class="page-name"><b>PM‑µ</b> · Micro — info</span>
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</div>
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<nav class="site-nav">
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<a href="/editor.html">Editor</a>
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<a href="/concepts.html">Concepts</a>
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<a href="/micro.html">Open ↗</a>
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<h1>PM‑µ — Micro</h1>
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<div class="tags"><span class="tag hw">Hardware</span><span class="tag">Inline practice bar</span><span class="tag">~$35 one‑off</span></div>
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<p class="lead">A long, narrow practice bar you patch <i>into</i> your signal: instrument in one end, amp or
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headphones out the other, the click mixed in. One clickable thumb‑roller does everything, an amber
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14‑segment display shows tempo and track names, and it runs over USB‑C — a wall adapter or a power bank.</p>
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<div class="embed-wrap">
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<div data-varasys-metronome="micro"
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data-patch="v1;t120;kick:4;snare:4=.X.X;hatClosed:4/2" data-height="240"></div>
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</div>
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<p class="cap">Live widget (embedded). <a href="/micro.html">Open the full Micro page ↗</a> · <a href="/embed.html">embed this</a></p>
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<h2>Designed for</h2>
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<p>Practising plugged in — at the desk or on the go. It sits inline in your signal chain: a 1/4″ TRS input on
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one end, USB‑C and a 1/4″ TRS output on the other, with the metronome click summed into your signal in the
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<b>analog domain</b> (and a small monitor speaker). No menus — a single clickable thumb‑roller does it all
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(roll = tempo, press = start/stop, hold + roll = switch track), and the amber 14‑segment display shows the
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BPM or the track name. Powered over USB‑C — a wall adapter for a permanent practice‑space install, or a
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pocket power bank when you're mobile (no internal battery to wear out); ships with the editor's grooves built in.</p>
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<h2>Bill of materials</h2>
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<p class="sub">Rough parts list — a USB‑C‑powered RP2040 inline bar with analog click injection.
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Ballpark one‑off prices (USD); cheaper at volume.</p>
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<table class="bom">
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<thead><tr><th>Part</th><th class="q">Qty</th><th class="c">~$</th></tr></thead>
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<tbody>
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<tr class="grp"><td colspan="3">Brain & display</td></tr>
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<tr><td class="part">RP2040 board, USB‑C <span class="spec">— e.g. Waveshare RP2040‑Zero</span></td><td class="q">1</td><td class="c">4</td></tr>
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<tr><td class="part">4‑char 14‑segment alphanumeric LED + I²C driver <span class="spec">— amber; HT16K33. Shows BPM & track names</span></td><td class="q">1</td><td class="c">4</td></tr>
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<tr class="grp"><td colspan="3">Control</td></tr>
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<tr><td class="part">Clickable thumb‑roller <span class="spec">— EC11 encoder + roller wheel · roll / press / hold‑roll</span></td><td class="q">1</td><td class="c">2</td></tr>
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<tr class="grp"><td colspan="3">Audio — analog click injection</td></tr>
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<tr><td class="part">PCM5102A I²S DAC <span class="spec">— line‑level click</span></td><td class="q">1</td><td class="c">3</td></tr>
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<tr><td class="part">Dual op‑amp, NE5532 / OPA2134 <span class="spec">— hi‑Z instrument buffer + summing mixer</span></td><td class="q">1</td><td class="c">1</td></tr>
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<tr><td class="part">PAM8302A mono Class‑D + 8 Ω speaker <span class="spec">— monitor</span></td><td class="q">1</td><td class="c">4</td></tr>
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<tr class="grp"><td colspan="3">Connectors & power</td></tr>
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<tr><td class="part">1/4″ jack <span class="spec">— Inst In (TS) · Out (TRS)</span></td><td class="q">2</td><td class="c">2</td></tr>
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<tr><td class="part">USB‑C bus power (5 V) + PWR LED <span class="spec">— wall adapter or power bank; also carries config</span></td><td class="q">1</td><td class="c">1</td></tr>
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<tr class="grp"><td colspan="3">Build</td></tr>
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<tr><td class="part">Custom PCB (or perfboard)</td><td class="q">1</td><td class="c">4</td></tr>
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<tr><td class="part">Passives, headers, wire <span class="spec">— R/C for the analog stage + decoupling</span></td><td class="q">—</td><td class="c">2</td></tr>
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<tr><td class="part">Extruded aluminium bar enclosure + end caps <span class="spec">— bead‑blasted, matte‑black anodised</span></td><td class="q">1</td><td class="c">8</td></tr>
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<tr class="total"><td>Total (one‑off)</td><td class="q"></td><td class="c">≈ $35</td></tr>
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</tbody>
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</table>
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<p class="sub" style="margin-top:12px">Like the Stage, the click is summed in the <b>analog domain</b>: a high‑impedance
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buffer of the 1/4″ instrument input is mixed with the DAC's click and sent to the 1/4″ output and the monitor
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amp — your instrument is never re‑digitised (no added latency).</p>
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</main>
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<div class="site-foot">VARASYS · Simplifying Complexity — <span id="appVersion">v0.0.1-dev</span></div>
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