2 layers65 × 45 mm
2 layers65 × 45 mm
B timer
bitraf/electronics1Bitraf Electronics Library
- Size
- 65 × 45 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 121
- Nets
- 59
- Pads
- 312
- Tracks, vias
- 729, 183
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 29 Jan 2018
- Updated
- 20 Nov 2019
Overview
B timer is an open-source printed circuit board by bitraf, from the bitraf/electronics repository on GitHub. It is a 2-layer board of 65 × 45 mm with 121 parts on 59 nets, routed with 729 tracks and 183 vias.
It is built around the MIC5504-3.3YM5. Its parts include 90 diodes, 12 resistors, 10 capacitors, 3 switches and 2 ICs. It belongs with the STM32 boards of this library.
Main components
1README
README.mdBitraf Electronics Library (BEL)
This repository has a list of components available at Bitraf, all components are free to use for members. We strive to have the list of components found here available at all times, so members can use them in new designs.
There is also a list of referece designs made in KiCad, such as step down converter, hello world blinky led based on STM32 uC, a USB hub etc. These are meant to be used as building blocks for ne designs for both members and others.
For B-Timer, see /Reference-designs/stm32f070/B-timer.
Parts
121| Qty | Value | Footprint | References |
|---|---|---|---|
| 90 | LED | LEDs:LED_0603 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +74 |
| 10 | 68R | Resistors_SMD:R_0402 | R1, R2, R3, R4, R5, R6, R7, R8, R9, R10 |
| 6 | 0.1µF | Capacitor_SMD:C_0402_1005Metric | C1, C3, C4, C5, C6, C10 |
| 3 | SW_Push | Buttons_Switches_SMD:SW_SPST_B3S-1000 | SW1, SW2, SW3 |
| 2 | 18pF | Capacitor_SMD:C_0402_1005Metric | C7, C8 |
| 2 | 1µF | Capacitor_SMD:C_0402_1005Metric | C2, C9 |
| 2 | 22R | Resistor_SMD:R_0402_1005Metric | R11, R12 |
| 1 | Buzzer | Buzzers_Beepers:Buzzer_Murata_PKMCS0909E4000-R1 | BZ1 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical_SMD | J2 |
| 1 | Crystal | Crystal:Crystal_SMD_HC49-SD | 8MHz1 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | STM32F070C6Tx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U1 |
| 1 | USB_B_Micro | Connectors:USB_Micro-B | J1 |
Questions
How big is the B timer PCB?
It measures 65 × 45 mm and has 2 copper layers, 1.6 mm thick.
What parts does the B timer use?
121 parts, built around the MIC5504-3.3YM5. 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 B timer KiCad files?
From the bitraf/electronics repository on GitHub, at the commit this page was made from: the board is Reference-designs/stm32f070/B-timer/PCB/B-timer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the B timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask bitraf before reusing the design.
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