2 layers75.5 × 61 mm
2 layers39.9 × 33.8 mm
Delaytimer
synfinatic/delaytimer12V/2A Adjustable Delay Timer
- Size
- 39.9 × 33.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 15
- Pads
- 57
- Tracks, vias
- 129, 5
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 18 Feb 2017
- Updated
- 5 Mar 2017
Overview
Delaytimer is an open-source printed circuit board by synfinatic, from the synfinatic/delaytimer repository on GitHub. It is a 2-layer board of 39.9 × 33.8 mm with 22 parts on 15 nets, routed with 129 tracks and 5 vias.
It is built around the NE555, MMBT3904 and MMBT3906, with the IRLML6344 among its other parts. Its parts include 9 resistors, 5 transistors, 3 capacitors, 1 IC and 1 diode.
Main components
4
NE555
SOP-8-20℃~+70℃ 1 1.5mA 200mA 4.5V~15V Adjustable duty cycle oscillation、Reset function、Duty cycle stabilization SOP-8 555 Timers / Counters ROHSGRTimers / Counters
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)MMBT3906
SOT-23-55℃~+150℃ 1 PNP 100 100nA 200mA 200mW 300MHz 300mV 40V 5V PNP SOT-23 Bipolar (BJT) ROHSTWGMCBipolar (BJT)IRLML6344
SOT-23-55℃~+150℃ 1 N-channel 1.1V 1.3W 29mΩ@4.5V 30V 46pF 5A 6.8nC@4.5V 650pF SOT-23 MOSFETs ROHSGuangdong HottechMOSFETs
README
README.md12V/2A Delay Timer
About
This is a simple adjustable power-off delay timer supporting 5-12V DC and up to 2A.
When the power is turned on (both 12V and Switch are "on") then Output is also on. When Switch is "off", then a timer starts. When the timer expires (0-55 seconds) then Output is turned off.
Specs
- Voltage: 5-12VDC
- Max Switched Current: 2A @ 12V
- Delay: 0-55 seconds
- Power requirements when running: 5ma @ 12V
- Power requrements when turned off: 0ma
Connections
- GND - Ground
- 5-12V - Unswitched 5-12V DC power
- Switch - Switched 5-12V DC power
- Output - 2A/5-12V DC delayed power off
Project Files
License and Copyright
Copyright 2017 Aaron Turner
This project is licensed under the GPLv3.
References
Special thanks to Rob Paisley who helped with the circuit design.
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 2.2k | Resistors_SMD:R_0805_HandSoldering | R2, R5, R7, R8 |
| 2 | 0.1uf | Capacitors_SMD:C_0805_HandSoldering | C1, C2 |
| 2 | 100k | Resistors_SMD:R_0805_HandSoldering | R1, ROpt1 |
| 2 | 10k | Resistors_SMD:R_0805_HandSoldering | R4, R6 |
| 2 | MMBT3904 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q1, Q2 |
| 2 | MMBT3906 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q3, Q4 |
| 1 | Connectors:1pin | ||
| 1 | 100uf | Capacitors_SMD:c_elec_6.3x7.7 | C3 |
| 1 | 1k | Resistors_SMD:R_0805_HandSoldering | R9 |
| 1 | 1n4148 | Diodes_SMD:SOD-123 | D1 |
| 1 | 500k | Potentiometers:Potentiometer_Bourns_3296W_3-8Zoll_Inline_ScrewUp | RV1 |
| 1 | CONN_01X04 | Connectors_Terminal_Blocks:TerminalBlock_Pheonix_PT-3.5mm_4pol | P1 |
| 1 | IRLML6344 | TO_SOT_Packages_SMD:SOT-23_Handsoldering | Q5 |
| 1 | NE555 | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | U1 |
Questions
How big is the Delaytimer PCB?
It measures 39.9 × 33.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Delaytimer use?
22 parts, built around the NE555, MMBT3904, MMBT3906 and IRLML6344. 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 Delaytimer KiCad files?
From the synfinatic/delaytimer repository on GitHub, at the commit this page was made from: the board is kicad/delaytimer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Delaytimer design in my own project?
Its repository states no licence, so its author keeps all rights: ask synfinatic before reusing the design.
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