2 layers

Hbridge

The goal was to drive around the track as quickly as possible.

Copper layers: 2
Thickness: 1.6 mm
Parts: 14
Nets: 16
Pads: 44
Tracks, vias: 73, 2
Pours: 4
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 18 Oct 2025
Updated: 11 Aug 2026

Overview

Hbridge is an open-source printed circuit board by BalderHolst, from the BalderHolst/linefollower repository on GitHub. It is a 2-layer board with 14 parts on 16 nets, routed with 73 tracks and 2 vias.

It is built around the BC550. Its parts include 6 transistors, 4 diodes, 2 resistors and 2 connectors.

Main components

BC550
TO-92-31 NPN 100mA 110 15nA 300MHz 45V 500mW 600mV 6V NPN Standalone TO-92-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)

README

README.md

Linefollower

This project was developed while teaching 1. semester robotics students at SDU to see what I achieve with the same robots as the students.

The goal was to drive around the track as quickly as possible.

Video

Video of the robot driving around the track

Project files

Show this board on your page

https://pcbkit.io/boards/BalderHolst/linefollower

The board's own page, for a message or a post.

Source

Repository: BalderHolst/linefollower
Board file: pcb/hbridge/hbridge.kicad_pcb
Commit: 5f9cc0e
Licence: Not stated

Parts

Qty	Value	Footprint	References
4	1N4001	Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal	D1, D2, D3, D4
2	10k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R2
2	BC550	Package_TO_SOT_THT:TO-92_Inline_Wide	Q5, Q6
2	NMOS	Package_TO_SOT_THT:NEC_Molded_7x4x9mm	Q3, Q4
2	PMOS	Package_TO_SOT_THT:NEC_Molded_7x4x9mm	Q1, Q2
1	Conn_02x06	Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical	J2
1	Screw_Terminal_01x02	TerminalBlock:TerminalBlock_bornier-2_P5.08mm	J1

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Questions

What parts does the Hbridge use?

14 parts, built around the BC550. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Hbridge KiCad files?

From the BalderHolst/linefollower repository on GitHub, at the commit this page was made from: the board is pcb/hbridge/hbridge.kicad_pcb and its schematic kicad/kicad.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Hbridge design in my own project?

Its repository states no licence, so its author keeps all rights: ask BalderHolst before reusing the design.