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# PM_T‑1 Teacher

The full‑feature studio / lesson desk console — a colour TFT showing every lane, arcade buttons and a thumb‑roller, with your instrument running through and the click mixed in.

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## What it is

HardwareStudio / lesson console~$59 one‑off

The full‑feature desktop console: a colour readout of every lane, fast set‑list navigation, and your instrument running straight through with the click mixed in — the hands‑on unit for a studio desk or a teaching room, on a non‑reflective matte‑black case. (For hands‑free live use, see the foot‑operated Stage stompbox.)

Top‑mounted 1/4″ jacks keep cabling tidy; 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 or interface, plus a small monitor speaker. Powered over USB‑C — a wall adapter or a power bank. The colour TFT shows tempo, the item name and all lane patterns; arcade buttons + a recessed thumb‑roller make it quick to drive while you teach or track.

Spec & bill of materials

Rough parts list — a desk/studio RP2040 build (USB‑C powered) with analog click injection. Ballpark one‑off prices (USD); cheaper at volume.

Part | Qty | ~$
--- | --- | ---
Brain & display
RP2040 board, USB‑C — e.g. Waveshare RP2040‑Zero / Pico‑clone | 1 | 4
2.0″ 320×240 IPS TFT, ST7789 — SPI | 1 | 8
Controls
Arcade pushbutton, 24 mm — Prev · Next · Tap | 3 | 4
Arcade pushbutton, 30 mm — Play | 1 | 2
Detented encoder (EC11 / PEC12) + side‑mount thumb‑roller — recessed; nothing to snap off | 1 | 2
Audio — analog click injection
PCM5102A I²S DAC — line‑level click | 1 | 3
Dual op‑amp, NE5532 / OPA2134 — hi‑Z instrument buffer + summing mixer | 1 | 1
Balanced line driver, DRV134 — (or cross‑coupled op‑amp) → 1/4″ TRS out | 1 | 4
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 — 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) |  | ≈ $56

Audio is summed in the analog domain: the DAC's click is mixed with a high‑impedance buffer of the 1/4″ instrument input, then fed to the balanced line driver (1/4″ TRS out) and the monitor amp — so your instrument is never re‑digitised (no added latency).

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