PM‑µ — Micro
-A long, narrow practice bar you patch into your signal: instrument in one end, amp or headphones out the other, the click mixed in. One clickable thumb‑roller does everything, an amber - 14‑segment display shows tempo and track names, and it runs off USB‑C or 2×AA.
+ 14‑segment display shows tempo and track names, and it runs over USB‑C — a wall adapter or a power bank.Bill of materials
-Rough parts list — a portable RP2040 inline bar (USB‑C or 2×AA) with analog click injection. +
Rough parts list — a USB‑C‑powered RP2040 inline bar with analog click injection. Ballpark one‑off prices (USD); cheaper at volume.
| Part | Qty | ~$ |
|---|---|---|
| PAM8302A mono Class‑D + 8 Ω speaker — monitor | 1 | 4 |
| Connectors & power | ||
| 1/4″ jack — Inst In (TS) · Out (TRS) | 2 | 2 |
| USB‑C bus power (5 V) + PWR LED — also carries config | 1 | 1 |
| 2×AA holder + boost/management + battery gauge — AA → 3.3/5 V for portable use | 1 | 3 |
| USB‑C bus power (5 V) + PWR LED — wall adapter or power bank; also carries config | 1 | 1 |
| Build | ||
| Custom PCB (or perfboard) | 1 | 4 |
| Passives, headers, wire — R/C for the analog stage + decoupling | — | 2 |
| Extruded aluminium bar enclosure + end caps — bead‑blasted, matte‑black anodised | 1 | 8 |
| Total (one‑off) | ≈ $38 | |
| Total (one‑off) | ≈ $35 | |
Like the Stage, the click is summed in the analog domain: a high‑impedance diff --git a/info-stage.html b/info-stage.html index 9520fbe..e53c867 100644 --- a/info-stage.html +++ b/info-stage.html @@ -63,11 +63,11 @@
The stage and the rehearsal room. Top‑mounted 1/4″ jacks keep cabling tidy on a board; you plug your instrument in, the metronome click is summed into the signal in the analog domain (no re‑digitising, no added latency) and sent to a balanced 1/4″ TRS output for the desk, plus a small monitor speaker. - Powered from a standard 9 V DC pedal supply or USB‑C. The colour TFT shows tempo, the item name, and all - lane patterns; arcade buttons + a recessed thumb‑roller survive stage abuse.
+ Powered over USB‑C — a wall adapter, or a power bank when there's no outlet on the board. The colour TFT + shows tempo, the item name, and all lane patterns; arcade buttons + a recessed thumb‑roller survive stage abuse.Bill of materials
-Rough parts list — a pedalboard‑friendly RP2040 build (9 V DC or USB‑C) with analog click injection. +
Rough parts list — a pedalboard‑friendly RP2040 build (USB‑C powered) with analog click injection. Ballpark one‑off prices (USD); cheaper at volume.
| Part | Qty | ~$ |
|---|---|---|
| PAM8302A mono Class‑D + 8 Ω 2 W speaker — monitor | 1 | 4 |
| Connectors & power | ||
| 1/4″ jack — Inst In (TS) · Out (TRS) · Trig In (TS) | 3 | 3 |
| USB‑C bus power (5 V) + PWR LED — same port carries config; no battery | 1 | 1 |
| 9 V DC pedal jack (2.1 mm centre‑neg) + 9 V→5 V buck + reverse‑polarity protect — pedalboard power | 1 | 3 |
| USB‑C bus power (5 V) + PWR LED — wall adapter or power bank; same port carries config; no battery | 1 | 1 |
| Build | ||
| Custom PCB (or perfboard) | 1 | 5 |
| Passives, headers, wire — R/C for the analog stage + decoupling | — | 3 |
| Die‑cast aluminium enclosure (Hammond 1590‑style) — bead‑blasted, matte‑black Type II anodise, laser‑etched legends | 1 | 12 |
| Total (one‑off) | ≈ $59 | |
| Total (one‑off) | ≈ $56 | |
Audio is summed in the analog domain: the DAC's click is mixed with a high‑impedance diff --git a/micro.html b/micro.html index 1461d29..5cb1674 100644 --- a/micro.html +++ b/micro.html @@ -16,8 +16,9 @@