group,id,part,spec,qty,status,notes
"Core","pico","Raspberry Pi Pico 2W","RP2350, micro-USB","1","have","The whole engine runs on it with lots of headroom."
"Core","lcd","Nokia 5110 LCD module","PCD8544, 84×48, SPI","1","have","The module you used with Arduino."
"Core","box","Enclosure","","1","have","About 80 × 150 × 40 mm. Panel layout: tools/panel.html."
"Controls","enc","Rotary encoder with push","KY-040 module or bare EC11","1","have","Power it from 3V3."
"Controls","pots","Potentiometer, linear","B10K (anything 5k–50k linear works)","2","have","Energy and Drift."
"Controls","knobs","Knobs","to fit the pot and encoder shafts","3","check","Shaft types differ (D, knurled, 6 mm). Match them."
"Controls","btn","Momentary push button, panel mount","~12 mm, non-latching","11","check","7 kit + 4 line tracks."
"Controls","seedbtn","Momentary push button, large","16–22 mm, non-latching","1","check","SEED. Any big momentary works."
"Controls","tog","Toggle switch, SPDT","","1","have","RUN / STOP. Your old bypass switch."
"Controls","dio","1N4148 diode","or 1N4448 / 1N914 / any small-signal diode","12","buy","11 for the button matrix + 1 for MIDI IN. 1N4448 works too. Every button needs one: a missing diode gives phantom presses with three buttons held."
"MIDI","trs","3.5 mm stereo (TRS) jack, panel mount","3 lugs: tip, ring, sleeve. Not mono.","3","check","IN, OUT KIT, OUT SYNTH. MIDI TRS Type A. 6 mm hole each."
"MIDI","adapt","TRS-to-DIN MIDI adapter, Type A","female DIN, 3.5 mm plug","1","buy","For a DIN synth or sampler (e.g. MiniFreak). Must say Type A (Type B swaps tip and ring). Type A TRS gear (e.g. SP-404MKII) takes a plain stereo 3.5 mm cable."
"MIDI","opto","6N137 optocoupler","DIP-8 (6N138 also works: then drop the pin 7 link)","1","have","MIDI IN. You have three; one is used."
"MIDI","sock","DIP-8 IC socket","","1","buy","So the opto can be swapped."
"MIDI","r330","Resistor 330 Ω","220–470 Ω","1","check","LCD backlight (LED pin) to 3.3 V, inline at the module."
"MIDI","r220","Resistor 220 Ω","150–220 Ω","1","have","MIDI IN, in series with the opto LED. The 6N137 wants a bit more LED current: use 150 Ω if learning misses notes."
"MIDI","r1k","Resistor 1 kΩ","470 Ω–2.2 kΩ is fine","2","have","Opto output pull-up, NPN base."
"MIDI","r33","Resistor 33 Ω, ½ W","27–47 Ω is fine","2","buy","MIDI OUT ring (pin 4) line, per the MIDI 3.3 V spec. ½ W because a mono plug in an OUT jack shorts it straight to ground (0.33 W); a ¼ W one would cook."
"MIDI","r10","Resistor 10 Ω","10–22 Ω is fine","2","check","MIDI OUT tip (pin 5) line, from TX. Don't replace with a wire: it protects the pin."
"MIDI","cap","Ceramic capacitor 100 nF","anything 47–220 nF","3","check","C1 on the board (6N137 supply bypass, required). Optional: one per pot, soldered at the pot from wiper to the left lug, if the readings jitter."
"Screen extras","blt","NPN or PNP transistor","2N3904 / BC547 (NPN) or 2N3906 / BC557 (PNP)","1","opt","Only for a dimmable backlight. NPN if your BL lights when grounded, PNP if it lights from 3.3 V. Otherwise hard-wire it."
"Power and assembly","perf","Stripboard","at least 34 × 28 holes (about 86 × 71 mm)","1","check","Pico socketed at the top edge, so its USB port meets a slot in the back wall."
"Power and assembly","hdr","Female header strip, 1 × 20","2.54 mm","2","check","Socket the Pico instead of soldering it in."
"Power and assembly","mhdr","Male header strip, 1 × 20","2.54 mm","2","check","Soldered to the Pico so it plugs into the female headers. Skip if yours is a Pico 2 WH (headers fitted)."
"Power and assembly","tape","Double-sided foam tape or hot glue","","—","check","Holds the stripboard and the screen without screws."