4 layers100 × 100 mm
DAC ADC PWM IO
DanielMartensson/STM32-PLC
STM32 microcontroller with lots of periferials such as ADC, differential ADC, Input Capture, PWM, USB, Encoder, DAC, Digital Input, RTC, CAN-bus + Alarm etc.
270 parts183MIT
2 layers24 × 34 mm
Timer
antonloof/555A (or two actully) 555 timer made from some junk found in drawers
- Size
- 24 × 34 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 20
- Pads
- 72
- Tracks, vias
- 168, 15
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 27 Mar 2021
- Updated
- 27 Mar 2021
Overview
Timer is an open-source printed circuit board by antonloof, from the antonloof/555 repository on GitHub. It is a 2-layer board of 24 × 34 mm with 23 parts on 20 nets, routed with 168 tracks and 15 vias.
It is built around the LM2902 and BC847. Its parts include 12 resistors, 4 capacitors, 2 ICs, 2 diodes and 2 transistors.
Main components
2
LM2902
SOP-14-15V~-1.5V、1.5V~15V -40℃~+125℃ 1.3MHz 2nA 300nA 30uV/℃ 3V~30V 4 400V/ms 40mA 40nV/√Hz@1kHz 700uA 7mV 80dB Built-in compensation SOP-14 Operational Amplifier ROHSSlkorOperational Amplifier
BC847
SOT-231 NPN 100MHz 100mA 100nA 110 200mW 45V 500mV 6V NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
README
README.md555 timer
A (or two actully) 555 timer made from some junk found in drawers
Could become a future "learn to PCB" project
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 5K | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R3, R4, R5, R9, R10, R11 |
| 4 | 1k | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R6, R7, R12 |
| 2 | 100k | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2, R8 |
| 2 | 100n | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C2, C3 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1, C4 |
| 2 | BC847 | Package_TO_SOT_SMD:SOT-323_SC-70_Handsoldering | Q1, Q2 |
| 2 | LED | LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1, D2 |
| 1 | 7402 | Package_DIP:DIP-14_W7.62mm | U2 |
| 1 | Conn_01x02_Female | TerminalBlock:TerminalBlock_Altech_AK300-2_P5.00mm | J1 |
| 1 | LM2902 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U1 |
Similar boards
- 2 layers98 × 149 mm
- 4 layers94 × 52.1 mm
Stm32 ltc encoder
max-verem/stm32_ltc_encoder
STM32 based SMPTE Linear Timecode Generator/Reader, isolated input/output
50 parts3 - 2 layers62.5 × 80 mm
VU Meter
Synthron/SymAsym
High Power Audio Amplifier based on the Red Devil SymAsym PCBs from audiopcb.de
159 parts2 - 2 layers100.3 × 100.3 mm
- 2 layers220 × 145.5 mm
PCB Morro Bay
ParadigmHyperloop/testing-hardware
PCBs and other electrical things for Paradigm's post-competition 4 testing efforts
347 parts1 - 2 layers130 × 100 mm
Audiovisualiser
alimleahat/analog-audio-visualizer-pcb
Three-band analog audio visualizer built in KiCad for ELEC2101, with PCB files, assembly photos, and bench measurements.
69 parts - 2 layers60 × 46.8 mm
Questions
How big is the Timer PCB?
It measures 24 × 34 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Timer use?
23 parts, built around the LM2902 and BC847. 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 Timer KiCad files?
From the antonloof/555 repository on GitHub, at the commit this page was made from: the board is timer/timer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask antonloof before reusing the design.