2 layers350 × 70 mm
Rack Front Panel
BayLibre/Labrack
A standard 1U rack front panel metal sheet and PCB providing power, connectivity and more.
50 parts1
2 layers20 × 30 mm
Power Button Press Automation
RICCIARDI-Adrien/Power_Button_Press_AutomationA fully analog circuit to simulate a power button press.
- Size
- 20 × 30 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 9
- Pads
- 46
- Tracks, vias
- 50, 12
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 Oct 2025
- Updated
- 24 Nov 2025
Overview
Power Button Press Automation is an open-source printed circuit board by RICCIARDI-Adrien, from the RICCIARDI-Adrien/Power_Button_Press_Automation repository on GitHub, published under the MIT licence. It is a 2-layer board of 20 × 30 mm with 18 parts on 9 nets, routed with 50 tracks and 12 vias.
It is built around the LM393DT, BSS138 and TBC05-02-1-G-G. Its parts include 7 resistors, 4 capacitors, 2 transistors, 2 connectors and 1 IC.
Main components
3
LM393DT
SO-8-18V~-1V、1V~18V -55℃~+125℃ 1.3us 1.3us 1mV 2 20nA 2V~36V 36V 3nA 450uA DTL、TTL、CMOS、ECL、MOS SO-8 Comparators ROHSSTMicroelectronicsComparators
BSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETsTBC05-02-1-G-G
-- HWDG ROHSGlobal Connector Technology (GCT)Uncategorised
README
README.mdPower button press automation
A fully analog circuit that activates an open-drain transistor for 1.5s after having waited 3s for the power supply to stabilize.
The timings can be adjusted by changing the RC circuits component values.
It is currently designed for a 12V power supply and can drive any power switch from 1.8V onwards.
The circuit will rearm itself only when the board 12V is removed then reapplied. Thus, it is possible to do a software reboot of the PC or powering it off like with a normal power button.
How it works
Digital timing diagram :
Steps :
- Before the timing diagram event labeled
1, the power supply is not present and the button output is kind of floating. - The +12V power supply is applied at the event labeled
1. The button output stays high due to a pull-up connected to the +12V. - After about 3.5s, the button is pressed (its output is forced to ground). This is the diagram event labeled
2. - The button is kept pressed for about 1.75s, then it is released. This corresponds to the diagram event labeled
3. - After that, the button is never pressed again until the whole power supply is removed then reapplied.
Hardware
Bare PCB :
Assembled PCB :
Prototype :
The prototype has been made with recycled parts from old broken machines.
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R5, R7 |
| 3 | 10u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C1, C3, C4 |
| 2 | 150K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R4 |
| 2 | 18K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3, R6 |
| 2 | BSS138 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2 |
| 2 | TBC05-02-1-G-G | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MPT-0,5-2-2.54_1x02_P2.54mm_Horizontal | J1, J2 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C2 |
| 1 | LM393DT | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
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Questions
How big is the Power Button Press Automation PCB?
It measures 20 × 30 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Power Button Press Automation use?
18 parts, built around the LM393DT, BSS138 and TBC05-02-1-G-G. 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 Power Button Press Automation KiCad files?
From the RICCIARDI-Adrien/Power_Button_Press_Automation repository on GitHub, at the commit this page was made from: the board is Hardware/Power_Button_Press_Automation.kicad_pcb and its schematic Hardware/Power_Button_Press_Automation.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Power Button Press Automation design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).