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4head

dcmini-org·dcmini-hw·4head/4head.kicad_pcb

4head PCB layout, top view — open source board by dcmini-org

About the 4head PCB

4head is an open source PCB design by dcmini-org, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 116 × 63.5 mm, with 11 components from 5 distinct parts.

Other key parts include the MAX30101 and OPA4196xD. By type, the board carries 8 capacitors and 3 ICs.

It belongs with the power & battery, sensors and iot & wireless designs in this gallery.

From the project

dcmini hardware repository

© 2025 The Johns Hopkins University Applied Physics Laboratory LLC

DCMini is a miniaturized biopotential amplifier and multi-sensor system designed for research applications in brain-computer interfaces (BCI), muscular interfaces, and closed-loop biofeedback. It combines a flexible set of sensors with powerful wireless telemetry and SD logging — in a package you can stick on your head.

4head, from the project README
From the project README

Main components on the 4head

MAX30101OPA4196xD

4head bill of materials (BOM)

11 components, 5 distinct parts.

QtyPartRefs
1
MAX30101
U1
2
OPA4196xD
U4, U5
1
10uF
C1
6
0.1uF
C2, C4, C5, C6, C7, C8
1
2.2uF
C3

4head design files

The KiCad project lives in the dcmini-org/dcmini-hw repository on GitHub; these links point at the commit this page was built from.

4head: common questions

How big is the 4head PCB?

The 4head measures 116 × 63.5 mm, has 2 copper layers and is 0.25256 mm thick.

How many components are on the 4head?

11 components, from 5 distinct parts. The full bill of materials is listed on this page.

Where can I download the 4head design files?

From the dcmini-org/dcmini-hw repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 4head design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which dcmini-org chose for the repository.

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