seedbox/docs/hardware/bom.csv

1	group	id	part	spec	qty	status	notes
2	Core	pico	Raspberry Pi Pico 2W	RP2350, micro-USB	1	have	The whole engine runs on it with lots of headroom.
3	Core	lcd	Nokia 5110 LCD module	PCD8544, 84×48, SPI	1	have	The module you used with Arduino.
4	Core	box	Enclosure		1	have	About 80 × 150 × 40 mm. Panel layout: tools/panel.html.
5	Controls	enc	Rotary encoder with push	KY-040 module or bare EC11	1	have	Power it from 3V3.
6	Controls	pots	Potentiometer, linear	B10K (anything 5k–50k linear works)	2	have	Energy and Drift.
7	Controls	knobs	Knobs	to fit the pot and encoder shafts	3	check	Shaft types differ (D, knurled, 6 mm). Match them.
8	Controls	btn	Momentary push button, panel mount	~12 mm, non-latching	11	check	7 kit + 4 line tracks.
9	Controls	seedbtn	Momentary push button, large	16–22 mm, non-latching	1	check	SEED. Any big momentary works.
10	Controls	tog	Toggle switch, SPDT		1	have	RUN / STOP. Your old bypass switch.
11	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.
12	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.
13	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.
14	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.
15	MIDI	sock	DIP-8 IC socket		1	buy	So the opto can be swapped.
16	MIDI	r330	Resistor 330 Ω	220–470 Ω	1	check	LCD backlight (LED pin) to 3.3 V, inline at the module.
17	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.
18	MIDI	r1k	Resistor 1 kΩ	470 Ω–2.2 kΩ is fine	2	have	Opto output pull-up, NPN base.
19	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.
20	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.
21	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.
22	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.
23	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.
24	Power and assembly	hdr	Female header strip, 1 × 20	2.54 mm	2	check	Socket the Pico instead of soldering it in.
25	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).
26	Power and assembly	tape	Double-sided foam tape or hot glue		—	check	Holds the stripboard and the screen without screws.