Lunchbox adapter

Spritkopf·lunchbox-adapter

Lunchbox adapter PCB layout, top view — open source board by Spritkopf

About the Lunchbox adapter PCB

Lunchbox adapter is an open source PCB design by Spritkopf, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 67.6 × 89.2 mm, with 83 components from 27 distinct parts.

Other key parts include the HCF4028B, LM1117-5.0 and LM2904. By type, the board carries 34 resistors, 16 diodes, 12 transistors, 8 capacitors, 7 connectors and 3 ICs.

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

From the project

My interpretation of the "BrotboxErsatzPlatine" instrument adapter for the BMW K100

This is my interpretation of the BrotboxErsatzPlatine instrument adapter for the BMW K100. It is based on the circuit originally created by Maru (maru-labs.com). Its purpose is to replace the original instrument unit of the BMW K100 (affectionately called lunchbox because of its distinctive shape) with 3rd party speedometer units. For more information have a look at maru-labs.com. I extended the circuit according to my own needs and put together my own circuit board.

Lunchbox adapter, from the project README — From the project README

Main components on the Lunchbox adapter

HCF4028B LM1117-5.0 LM2904

Lunchbox adapter bill of materials (BOM)

83 components, 27 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	HCF4028B	SOIC-16_3.9x9.9mm_P1.27mm	U1
1	LM1117-5.0	SOT-223-3_TabPin2	U2
1	LM2904	SO-8_3.9x4.9mm_P1.27mm	U3
11	SMBTA42	SOT-23	Q1, Q2, Q3, Q4, Q6, Q7, Q8, Q9 +3
1	BCP51	SOT-223	Q5
1	CONN_01X24 Conn_01x24	DIP-24_866	J1
2	CONN_01X03 Conn_01x03	PinHeader_1x03_P2.54mm_Vertical	J3, J8
2	CONN_01X03 Conn_01x03	PinHeader_1x04_P2.54mm_Vertical	J4, J5
2	CONN_01X06 Conn_01x06	PinHeader_1x06_P2.54mm_Vertical	J6, J7
1	JUMPER_4X2 Jumper_4x2	PinHeader_2x04_P2.54mm_Vertical	JP1
2	JUMPER_3_BRIDGED12 Jumper_3_Bridged12	PinHeader_1x03_P2.54mm_Vertical	JP2, JP3
10	D	D_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D1, D8, D9, D10, D11, D12, D13, D14 +2
1	P6KE15A	D_DO-15_P12.70mm_Horizontal	D2
5	LED	LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder	D3, D4, D5, D6, D7
2	10U 10u	CP_Elec_4x5.8	C1, C2
3	100N 100n	C_1206_3216Metric_Pad1.42x1.75mm_HandSolder	C3, C4, C8
1	56N 56n	C_0603_1608Metric_Pad1.05x0.95mm_HandSolder	C5
1	4.7U 4.7u	C_1206_3216Metric_Pad1.42x1.75mm_HandSolder	C6
1	220N 220n	C_1206_3216Metric_Pad1.42x1.75mm_HandSolder	C7
4	100K 100k	R_1206_3216Metric_Pad1.42x1.75mm_HandSolder	R1, R2, R3, R13

Show 7 more

Qty	Part	Footprint	Refs
17	10K 10k	R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R4, R6, R7, R11, R15, R16, R17, R18 +9
1	267	R_1206_3216Metric_Pad1.42x1.75mm_HandSolder	R5
4	680	R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R8, R9, R10, R12
2	1k	R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R14, R19
2	4.7K 4.7k	R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R21, R22
2	2.2K 2.2k	R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R23, R34
2	100 1.6W	5020_resistor_thermal_pads	R30, R31

Lunchbox adapter design files

The KiCad project lives in the Spritkopf/lunchbox-adapter repository on GitHub; these links point at the commit this page was built from.

Layoutlunchbox-adapter.kicad_pcb
BOMoutput/bom.csv

Lunchbox adapter: common questions

How big is the Lunchbox adapter PCB?

The Lunchbox adapter measures 67.6 × 89.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Lunchbox adapter?

83 components, from 27 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 Lunchbox adapter design files?

From the Spritkopf/lunchbox-adapter repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Lunchbox adapter design in my own project?

Yes, under the terms of its GPL-3.0 license, which Spritkopf chose for the repository.

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