17053719f1
Sync: the visual playhead now advances on a latency-compensated clock (currentTime − outputLatency||baseLatency) so the on-screen pulse lands when the click is HEARD, not when it's queued — previously the visual could lead the audio by the output buffer / Bluetooth latency (up to ~a subdivision). Applied to editor, player, teacher, and the new pages; also bound the visual queue (vq trim). No data races: single-threaded; only the rAF draw touches vqPtr/currentStep, and each vq entry carries the exact scheduled time of its sound. stage.html — foot-pedal stompbox: two heavy footswitches (Tap=tempo / hold=start- stop, Next=item / hold=prev), 1/4" expression-pedal input → tempo sweep, big floor-readable RGB beat light + angled TFT, analog instrument pass-through. showcase.html — pyramid display piece: an RGB-light pendulum easing to each beat plus per-lane segment rows showing subdivisions/accents/mutes (canvas). Both: dual USB-C (data+power and power-thru) to daisy-chain off one source. Wired into embed.js (stage, showcase variants), build.sh, deploy.sh, the concepts gallery + landing cards, info-stage.html (~$52) + info-showcase.html (~$39) with BOMs, and the README. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
121 lines
8.5 KiB
HTML
121 lines
8.5 KiB
HTML
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>PM‑1 Teacher — info & BOM — VARASYS</title>
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<link rel="icon" type="image/svg+xml" href="data:image/svg+xml;base64,@BUILD:favicon@">
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<body>
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<div class="head-left">
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<a class="brand" href="/" title="VARASYS — Simplifying Complexity">
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<img class="brand-logo brand-dark" src="data:image/png;base64,@BUILD:logo-dark@" alt="VARASYS — Simplifying Complexity" />
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<img class="brand-logo brand-light" src="data:image/png;base64,@BUILD:logo-light@" alt="VARASYS — Simplifying Complexity" />
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</a>
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<span class="page-name"><b>PM‑1</b> · Teacher — 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="/teacher.html">Open ↗</a>
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<button id="themeBtn" class="tbtn" title="toggle light / dark theme">☀</button>
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</nav>
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</header>
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<main>
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<h1>PM‑1 — Teacher</h1>
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<div class="tags"><span class="tag hw">Hardware</span><span class="tag">Studio / lesson console</span><span class="tag">~$59 one‑off</span></div>
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<p class="lead">The full‑feature desktop console: a colour readout of every lane, fast set‑list navigation, and
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your instrument running straight through with the click mixed in — the hands‑on unit for a studio desk or a
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teaching room, on a non‑reflective matte‑black case. (For hands‑free live use, see the foot‑operated
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<a href="/stage.html">Stage</a> stompbox.)</p>
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<div class="embed-wrap">
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<div data-varasys-metronome="teacher"
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data-patch="v1;t120;b16;kick:4=X.x.;snare:4=.X.X;hatClosed:4/4" data-height="520"></div>
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</div>
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<p class="cap">Live widget (embedded). <a href="/teacher.html">Open the full Teacher page ↗</a> · <a href="/embed.html">embed this</a></p>
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<h2>Designed for</h2>
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<p>The studio desk and the teaching room. Top‑mounted 1/4″ jacks keep cabling tidy; you plug your
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instrument in, the metronome click is summed into the signal in the <b>analog domain</b> (no re‑digitising,
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no added latency) and sent to a balanced 1/4″ TRS output for the desk or interface, plus a small monitor
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speaker. Powered over USB‑C — a wall adapter, or a power bank. The colour TFT shows tempo, the item name,
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and all lane patterns; arcade buttons + a recessed thumb‑roller make it quick to drive while you teach or track.</p>
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<h2>Bill of materials</h2>
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<p class="sub">Rough parts list — a desk/studio RP2040 build (USB‑C powered) 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 / Pico‑clone</span></td><td class="q">1</td><td class="c">4</td></tr>
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<tr><td class="part">2.0″ 320×240 IPS TFT, ST7789 <span class="spec">— SPI</span></td><td class="q">1</td><td class="c">8</td></tr>
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<tr class="grp"><td colspan="3">Controls</td></tr>
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<tr><td class="part">Arcade pushbutton, 24 mm <span class="spec">— Prev · Next · Tap</span></td><td class="q">3</td><td class="c">4</td></tr>
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<tr><td class="part">Arcade pushbutton, 30 mm <span class="spec">— Play</span></td><td class="q">1</td><td class="c">2</td></tr>
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<tr><td class="part">Detented encoder (EC11 / PEC12) + side‑mount thumb‑roller <span class="spec">— recessed; nothing to snap off</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">Balanced line driver, DRV134 <span class="spec">— (or cross‑coupled op‑amp) → 1/4″ TRS out</span></td><td class="q">1</td><td class="c">4</td></tr>
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<tr><td class="part">PAM8302A mono Class‑D + 8 Ω 2 W 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) · Trig In (TS)</span></td><td class="q">3</td><td class="c">3</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; same port carries config; no battery</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">5</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">3</td></tr>
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<tr><td class="part">Die‑cast aluminium enclosure (Hammond 1590‑style) <span class="spec">— bead‑blasted, matte‑black Type II anodise, laser‑etched legends</span></td><td class="q">1</td><td class="c">12</td></tr>
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<tr class="total"><td>Total (one‑off)</td><td class="q"></td><td class="c">≈ $56</td></tr>
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</tbody>
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</table>
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<p class="sub" style="margin-top:12px">Audio is summed in the <b>analog domain</b>: the DAC's click is mixed with a high‑impedance
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buffer of the 1/4″ instrument input, then fed to the balanced line driver (1/4″ TRS out) and the monitor amp —
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so 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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