16nx

About the 16nx PCB

16nx is an open source RP2040/RP2350 PCB design by 16n-faderbank, published on GitHub under the Custom license license. It is a 2-layer board measuring 248.9 × 120.7 mm, with 151 components from 28 distinct parts.

Its main chip is the RP2040, from the RP2040/RP2350 family. Other key parts include the MCP6004, W25Q16JVUXIQ, CD74HC4067M and AP2112K-3.3. By type, the board carries 78 resistors, 23 capacitors, 20 connectors, 8 ICs, 3 diodes and 2 switches.

It belongs with the audio and test & measurement designs in this gallery.

From the project

16nx is a controller for musical instruments. Sixteen faders,MIDI over USB and jack, CV out, and I2C out. Based around RP2040.

Electronics CAD and design for the 16nx faderbank, in KiCAD 8.0.4 format.

16nx is a redesign of the original [16n][16n] project. It has identical functionality to the original project. The changes are:

- replace Teensy 3.2 board with RP2040 microcontroller and supporting circuitry, directly on the board - move to USB-C connector - add more power filtering onto 5V line - redesign analog circuitry for CV outs. Rather than running the faders at 5V and dividing down to ~3.2V for the microcontroller, 16nx runs at 3.3V everywhere, and amplifies fader values up to ~5V via the MCP6004 opamps. -…

16nx, from the project README — From the project README

Main components on the 16nx

MCP6004 RP2040 W25Q16JVUXIQ CD74HC4067M AP2112K-3.3

16nx bill of materials (BOM)

151 components, 28 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
4	MCP6004	SOIC-14_3.9x8.7mm_P1.27mm	U1, U2, U3, U4
1	RP2040	RP2040-QFN-56	U5
1	W25Q16JVUXIQ	USON-8_L3.0-W2.0-P0.50-BL-EP	U6
1	CD74HC4067M	SSOP-24_5.3x8.2mm_P0.65mm	U7
1	AP2112K-3.3	SOT-23-5	U8
1	X322512MSB4SI	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
2	AUDIOJACK3_SWITCHT AudioJack3_SwitchT	Schurter 4832.2330	J1, J2
1	USB_C_RECEPTACLE_USB2.0 USB_C_Receptacle_USB2.0	USB_C_Receptacle_HRO_TYPE-C-31-M-12	J3
1	CONN_01X03 Conn_01x03	JST_SM03B-SRSS-TB(LF)(SN)	J4
16	AUDIOJACK2_SWITCHT AudioJack2_SwitchT	Thonkiconn	J5, J6, J7, J8, J9, J10, J11, J12 +8
16	R_Potentiometer	Alps_60mm_Fader	RV1, RV2, RV3, RV4, RV5, RV6, RV7, RV8 +8
1	SW_DPDT_X2 SW_DPDT_x2	SW_E-Switch_EG2211_DPDT	SW1
1	SW_Push	SW_SPST_EVQP2	SW3
2	BAT54S	SOT-23	D1, D2
1	LED_Small	LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	D3
16	100N 100n	C_0402_1005Metric	C1, C2, C3, C4, C7, C8, C9, C10 +8
2	27P 27p	C_0402_1005Metric	C5, C6
4	1u	C_0402_1005Metric	C17, C18, C22, C23
1	47U 47u	CP_Elec_5x5.4	C21
35	1k	R_0402_1005Metric	R1, R4, R7, R10, R13, R16, R19, R22 +27

Show 8 more

Qty	Part	Footprint	Refs
16	10K 10k	R_0402_1005Metric	R2, R5, R8, R11, R14, R17, R20, R23 +8
16	5K6 5k6	R_0402_1005Metric	R3, R6, R9, R12, R15, R18, R21, R24 +8
2	27.4	R_0402_1005Metric	R49, R50
1	DNP	R_0402_1005Metric	R52
2	47	R_0402_1005Metric	R54, R55
2	4K7 4k7	R_0402_1005Metric	R56, R57
2	5K1 5k1	R_0402_1005Metric	R58, R59
2	100	R_0402_1005Metric	R62, R63

16nx design files

The KiCad project lives in the 16n-faderbank/16nx repository on GitHub; these links point at the commit this page was built from.

16nx: common questions

What microcontroller does the 16nx use?

The 16nx is built around the RP2040, from the RP2040/RP2350 family.

How big is the 16nx PCB?

The 16nx measures 248.9 × 120.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 16nx?

151 components, from 28 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the 16nx design files?

From the 16n-faderbank/16nx repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 16nx design in my own project?

It is published under Custom license, which limits how it may be reused; read the license before building on it.

Can I test firmware for the 16nx without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.