2 layers69.9 × 114.3 mm
Led smart plug
wbsipz/hardware-design-portfolio
Hardware design portfolio featuring power electronics, embedded control, and PCB projects.
116 parts
2 layers100 × 88 mm
Hootswitch
saybur/hootswitch24ADB keyboard/mouse switch for vintage Mac computers.
- Size
- 100 × 88 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 127
- Nets
- 107
- Pads
- 435
- Tracks, vias
- 596, 80
- Pours
- 16
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 22 Jul 2024
- Updated
- 10 Oct 2026
Overview
Hootswitch is an open-source printed circuit board by saybur, from the saybur/hootswitch repository on GitHub. It is a 2-layer board of 100 × 88 mm with 127 parts on 107 nets, routed with 596 tracks and 80 vias.
It is built around the ADUM1201AR, LTV-357T and LM1117-5.0, with the MMBT3904 and B5819W among its other parts. Its parts include 53 resistors, 16 transistors, 14 capacitors, 12 connectors and 11 ICs. It belongs with the RP2040 boards of this library.
Main components
5
ADUM1201AR
SOIC-8-40℃~+105℃ 1 1 150ns 1Mbps 2 2.7V~5.5V 2.7V~5.5V 2500 25kV/us Bidirectional signal isolation、Multi-voltage domain interface、Power-on reset SOIC-8 Digital IsolatorsAnalog DevicesDigital Isolators
LTV-357T
SOP-4-2.54mm-55℃~+110℃ 1.2V 200mV 3.75kV 35V 3us 4us 50% 50mA 50mA 600% 6V DC SOP-4-2.54mm Transistor, Photovoltaic Output Optoisolators ROHSLite-OnPre-Ordered Products
LM1117-5.0
SOT-2231 1.3V@(1000mA) 15V 1A 2mA 5V Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHShongjiachengUncategorised
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
B5819W
SOD-123-55℃~+125℃ 1.5A 1mA@40V 25A 40V 600mV@1A Standalone SOD-123 Schottky Diodes ROHSMDDSchottky Diodes
README
hardware/README.mdHootswitch Hardware
IMPORTANT NOTE: the DC power jack does not work on any board revision due to a design error. If you make PCBs based on this design only USB power will function. You can work around this problem by bodging a wire from the negative terminal of the DC jack to a nearby ground connection but that isn't great for such an important connection.
This folder has the hardware design being used to develop the firmware. Known issues with it include:
- Some features are untested, including alternate power modes.
- C1 in the BOM is wrong. Since I am not using the power input at the moment I left it unpopulated.
- There is no keepout for the wireless chip, which may negatively impact reception.
- Annular rings on the mini-DIN connectors are on the small side.
- Green LEDs are too bright. Adjusted in 2024a with PWM. Future revision needs stronger resistors.
- Mounting holes are too small for the standard screws. These are also a tad too close to the connectors.
- A connection should be made between host power-on and a free GPIO. This can be worked around in software with keyboards.
- It might have been wiser to put bus input pins to GPIOs with PWM B inputs. This will probably not be changed, PIO handles everything fine.
Anticipate that a future revision will be made with corrections. CHANGES.txt will have any applicable history.
This project is made available under the CERN Open Hardware Licence strongly-reciprocal variant version 2, available at LICENSE.
This is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the CERN-OHL-S v2 for applicable conditions.
Parts
127| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 10K | Resistor_SMD:R_0603_1608Metric | R64, R65, R66, R67, R68, R69, R70, R71, R72, R73, R74, R75, R76, R77, R78, R79 |
| 16 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, Q16 |
| 15 | 2K2 | Resistor_SMD:R_0603_1608Metric | R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34 |
| 11 | 100nF | Capacitor_SMD:C_0603_1608Metric | C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14 |
| 7 | 1K | Resistor_SMD:R_0603_1608Metric | R11, R12, R13, R14, R15, R16, R17 |
| 6 | LED | LED_SMD:LED_0805_2012Metric | D1, D2, D3, D4, D5, D6 |
| 6 | Mini-DIN-4-G | hootswitch:5749181-1 | J1, J2, J3, J4, J5, J6 |
| 5 | 0 | Resistor_SMD:R_0603_1608Metric | R90, R91, R92, R93, R94 |
| 5 | 4K7 | Resistor_SMD:R_0603_1608Metric | R50, R51, R52, R53, R54 |
| 5 | ADuM1201AR | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3, U4, U5, U6, U7 |
| 5 | DNP | Inductor_SMD:L_0603_1608Metric | L1, L2, L3, L4, L5 |
| 4 | 330 | Resistor_SMD:R_0603_1608Metric | R81, R82, R83, R84 |
| 4 | LTV-357T | Package_SO:SO-4_4.4x3.9mm_P2.54mm | U8, U9, U10, U11 |
| 4 | M | MountingHole:MountingHole_2.7mm_M2.5 | H1, H2, H3, H4 |
| 2 | 10uF | Capacitor_SMD:C_0805_2012Metric | C2, C3 |
| 2 | B5819W | Diode_SMD:D_SOD-123 | D7, D8 |
| 1 | 100uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C1 |
| 1 | 470 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 500mA | Fuse:Fuse_Littelfuse_372_D8.50mm | F1 |
| 1 | Barrel_Jack_MountingPin | Connector_BarrelJack:BarrelJack_CUI_PJ-063AH_Horizontal_CircularHoles | J7 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | EXT_POW | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J8 |
| 1 | LM1117-5.0 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U2 |
| 1 | LOGO | hootswitch:hootswitch | G*** |
| 1 | POWSEL | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J10 |
| 1 | Pico | MCU_RaspberryPi_and_Boards:RPi_Pico_SMD_TH | U1 |
| 1 | SW1 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J9 |
| 1 | Switch1 | Button_Switch_THT:SW_SPST_Omron_B3F-315x_Angled | SW1 |
| 1 | TWI | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J12 |
| 1 | TWI | Connector_JST:JST_SH_BM04B-SRSS-TB_1x04-1MP_P1.00mm_Vertical | J11 |
Questions
How big is the Hootswitch PCB?
It measures 100 × 88 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Hootswitch use?
127 parts, built around the ADUM1201AR, LTV-357T, LM1117-5.0 and MMBT3904. 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 Hootswitch KiCad files?
From the saybur/hootswitch repository on GitHub, at the commit this page was made from: the board is hardware/hootswitch.kicad_pcb and its schematic hardware/hootswitch-computers.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Hootswitch design in my own project?
Its repository states no licence, so its author keeps all rights: ask saybur before reusing the design.
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