As-built: add on-page bill of materials; confirm analog click-injection
- Add a costed BOM panel below the loader, grouped by subsystem (brain & display, beat bar, controls, audio—analog click injection, connectors & power, build) with quantities and ballpark prices (~$61 one-off). - Reflect the confirmed analog mixing in the audio path / comment: PCM5102A click DAC → summing op-amp (NE5532/OPA2134) with a hi-Z instrument buffer → balanced line driver (DRV134) to the shared 1/4" TRS out, plus a PAM8302A monitor amp + speaker — the instrument is never re-digitised (no latency). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Me Here
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1 changed files with 53 additions and 2 deletions
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@ -18,8 +18,10 @@
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never hides the readout) with arcade pushbuttons spread below — PREV far
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left, NEXT far right, a big central PLAY — so you don't hit the wrong one;
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• rear I/O: external trigger in (footswitch), a 1/4" instrument pass-through
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with the click injected, and a shared 1/4" balanced-TRS main out; plus a
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MAX98357A-style monitor speaker, USB-C and a PWR LED, in a compact matte case.
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with the click mixed in the ANALOG domain (DAC → summing op-amp → balanced
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line driver), a shared 1/4" balanced-TRS main out, plus an analog monitor
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amp + speaker, USB-C and a PWR LED, in a compact matte case.
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A rough bill of materials for all of this is shown below the loader on the page.
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Compare with the idealized /player.html. One file, no deps; shares src/engine.js.
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-->
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<script>
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@ -151,6 +153,17 @@
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.status.ok{ color:#5fd08a } .status.err{ color:#ff7a7a }
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.hint{ font-size:11px; color:var(--muted) }
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code{ background:var(--field-bg); border:1px solid var(--field-bd); border-radius:4px; padding:1px 5px; font-size:11px }
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/* ---- bill of materials ---- */
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.bom{ width:100%; border-collapse:collapse; font-size:12px; margin-top:8px }
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.bom th, .bom td{ text-align:left; padding:5px 6px; border-bottom:1px solid var(--panel-bd); vertical-align:top }
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.bom th{ color:var(--muted); font-weight:600; font-size:10px; text-transform:uppercase; letter-spacing:.05em }
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.bom th.q, .bom th.c, .bom td.q, .bom td.c{ text-align:right; white-space:nowrap }
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.bom td.q, .bom td.c{ color:var(--muted) }
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.bom .grp td{ color:var(--cyan); font-weight:700; font-size:10px; text-transform:uppercase; letter-spacing:.07em; padding-top:11px }
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.bom .part{ color:var(--txt) }
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.bom .part .spec{ color:var(--muted); font-weight:400 }
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.bom tr.total td{ font-weight:700; color:var(--txt); border-top:2px solid var(--panel-bd); border-bottom:none; padding-top:8px }
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</style>
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</head>
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<body>
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@ -221,6 +234,44 @@
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<div class="status" id="status"></div>
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</div>
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<!-- ===================== BILL OF MATERIALS ===================== -->
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<div class="panel">
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<h2>Bill of materials</h2>
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<p class="sub">Rough parts list for the device above — an RP2040 build 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">Beat bar</td></tr>
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<tr><td class="part">WS2812B / SK6812 RGB LED <span class="spec">— 4×16 matrix (or 4× 16‑px strips), PIO‑driven</span></td><td class="q">64</td><td class="c">6</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">EC11 rotary encoder + knurled knob <span class="spec">— tempo</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">LiPo 1200 mAh + TP4056 charger + 5 V boost</td><td class="q">1</td><td class="c">6</td></tr>
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<tr><td class="part">Power slide switch + PWR LED</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">3D‑printed enclosure + screws / standoffs</td><td class="q">1</td><td class="c">5</td></tr>
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<tr class="total"><td>Total (one‑off)</td><td class="q"></td><td class="c">≈ $61</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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</div>
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<script>
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const APP_VERSION = "v0.0.1-dev";
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const $ = (id) => document.getElementById(id);
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