2 layers191.5 × 97.6 mm
Open Apple 1 SBC
davischris/OpenAC1
This work is largely based on the work of Tor-Eirik Bakke Lunde (https://github.com/tebl/RC6502-Apple-1-Replica).
72 parts4GPL-3.0
2 layers76.5 × 60 mm
HO Driver
kbralten/HO-DriverDC Motor Driver based on A3959SB-T
- Size
- 76.5 × 60 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 20
- Pads
- 99
- Tracks, vias
- 117, 78
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 28 Feb 2026
- Updated
- 3 Mar 2026
Overview
HO Driver is an open-source printed circuit board by kbralten, from the kbralten/HO-Driver repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 76.5 × 60 mm with 36 parts on 20 nets, routed with 117 tracks and 78 vias.
It is built around the L7805 and NE555P. Its parts include 12 capacitors, 11 resistors, 3 ICs, 2 diodes and 1 connector. It belongs with the robots and motor control boards of this library.
Main components
2
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
NE555P
DIP-80℃~+70℃ 100kHz 10mA 4.5V~16V DIP-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
README
README.mdHO Driver
DC Motor Driver based on A3959SB-T
This is based on the PDIP version of the chip, but the schematic is replicable to the SMD versions.
Major Blocks
There are two major blocks plus a support:
- The PWM generator is based on a
555and outputs a variable duty cycle signal as the ratio of resistance on Var1 changes. Connect a suitably large linear pot toVar1(e.g. 10k). - The motor driver is based around the
A3959chip. Current limit/sensing is handled by a bank of 5 1R resistors in parallel. Adjust as needed.- There are strapping resistors in
R10/R11that select between Fast and Slow modes for EXT_MODE by either strapping to ground or to VDD - populate only one of them. - There is a pin connection for a switch on
SW1which controls the motor direction.
- There are strapping resistors in
- There is a basic
7805based voltage regulator to create the digital VDD off the input voltage.
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100n | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C1, C2, C3, C4, C8, C9, C11 |
| 5 | 1R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5, R6, R7, R8, R9 |
| 3 | 1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R10, R11 |
| 3 | 220n | Capacitor_THT:C_Disc_D4.3mm_W1.9mm_P5.00mm | C6, C7, C12 |
| 2 | 1N4004 DO41 | Footprints:D-DO41 | D1, D2 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C5 |
| 1 | 1n | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | C10 |
| 1 | 5.1k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R3 |
| 1 | 51k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | A3959SB-T | SamacSys_Parts:DIP762W58P254L2990H533Q24N | U2 |
| 1 | Barrel_Jack_MountingPin | Connector_BarrelJack:BarrelJack_Horizontal | J1 |
| 1 | Conn_01x02_Socket | Connector_Wire:SolderWire-0.25sqmm_1x02_P4.5mm_D0.65mm_OD2mm | Mout1 |
| 1 | Conn_01x02_Socket | Connector_JST:JST_XH_B2B-XH-A_1x02_P2.50mm_Vertical | SW1 |
| 1 | Conn_01x03_Pin | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | Var1 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U1 |
| 1 | NE555P | Package_DIP:DIP-8_W7.62mm | U3 |
The 32 most common of 36 parts.
Similar boards
- 2 layers74.9 × 27.9 mm
- 4 layers200 × 142.3 mm
FRED Electrical Scheme KiCAD
GiulianoAgostini04/FRED-Project
Real-time concentration monitoring system based on frontal-lobe EEG signals. Features a custom PCB designed with TinkerCAD and KiCad, OpenBCI Ganglion and Arduino UNO for signal acquisition, display, and frequency-band…
93 parts1MIT - 2 layers194.3 × 174 mm
- 2 layers280 × 170 mm
- 2 layers84 × 54 mm
LPTastatur
stonedDiscord/Automatenplatinen
Reverse engineerte Hardware aus deutschen Spielautomaten.
23 parts5BSD-2-Clause - 2 layers105 × 60 mm
- 2 layers95 × 75 mm
RepeaterController
phastmike/neutec-repeater-hardware
Contains KiCad files for the Neutec Repeater Project. Firmware is on a different repository
58 parts
Questions
How big is the HO Driver PCB?
It measures 76.5 × 60 mm and has 2 copper layers, 1.6 mm thick.
What parts does the HO Driver use?
36 parts, built around the L7805 and NE555P. 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 HO Driver KiCad files?
From the kbralten/HO-Driver repository on GitHub, at the commit this page was made from: the board is HO Driver.kicad_pcb and its schematic HO Driver.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the HO Driver design in my own project?
Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).