

SR Latch
Various electronics test projects.
- Size
- 66 × 37 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 14
- Pads
- 50
- Tracks, vias
- 57, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 6 Oct 2023
- Updated
- 1 Dec 2023
Overview
SR Latch is an open-source printed circuit board by macmade, from the macmade/Electronics-Tutorials repository on GitHub. It is a 2-layer board of 66 × 37 mm with 21 parts on 14 nets, routed with 57 tracks and 0 vias.
It is built around the BC547. Its parts include 10 resistors, 4 transistors, 2 diodes, 2 switches and 1 connector.
Main components
1README
README.mdElectronics-Tutorials
About
Various electronics test projects.
Software
Schemas and PCB layouts are created with KiCad:
http://www.kicad-pcb.org
Footprints Library
This project requires the XS-Labs KiCad Library to be installed in KiCad.
Projects
[blocked] Astable Multivibrator

Bill Of Materials
| Manufacturer | Part No. | Details | Quantity |
|---|---|---|---|
| ON Semiconductor | BC547BTF | Bipolar Transistors - BJT NPN 45V 100mA HFE/450 | 2 |
| Vishay | MAL214258109E3 | Aluminium Electrolytic Capacitors - Radial Leaded 10uF 63V 20% | 2 |
| VCC | 4302H1-12V | Standard LEDs - Red - 12V | 2 |
| Vishay | CCF071K00JKE36 | Metal Film Resistors 1/4watt 1Kohms 5% | 2 |
| Vishay | CCF07100KJKE36 | Metal Film Resistors 1/4watt 100Kohms 5% | 2 |
| Wurth Elektronik | 691214110002 | Fixed Terminal Blocks WR-TBL 300VAC 10A 2P Horizontal | 1 |
[blocked] SR Latch

Bill Of Materials
| Manufacturer | Part No. | Details | Quantity |
|---|---|---|---|
| ON Semiconductor | BC547BTF | Bipolar Transistors - BJT NPN 45V 100mA HFE/450 | 4 |
| VCC | 4302H5-12V | Standard LEDs - Green - 12V | 1 |
| VCC | 4302H1-12V | Standard LEDs - Red - 12V | 1 |
| Vishay | CCF07390RJKE36 | Metal Film Resistors 1/4watt 390ohms 5% | 2 |
| Vishay | CCF071K00JKE36 | Metal Film Resistors 1/4watt 1Kohms 5% | 4 |
| Vishay | CCF0710K0JKE36 | Metal Film Resistors 1/4watt 10Kohms 5% | 4 |
| Omron | B3W-9010-R1R | Tactile Switches - Green | 1 |
| Omron | B3W-9010-R1R | Tactile Switches - Red | 1 |
| Wurth Elektronik | 691214110002 | Fixed Terminal Blocks WR-TBL 300VAC 10A 2P Horizontal | 1 |
[blocked] NPN Logic Gates

| Manufacturer | Part No. | Details | Quantity |
|---|---|---|---|
| ON Semiconductor | BC547BTF | Bipolar Transistors - BJT NPN 45V 100mA HFE/450 | 24 |
| VCC | 4302H5-12V | Standard LEDs - Green - 12V | 6 |
| VCC | 4302H1-12V | Standard LEDs - Red - 12V | 4 |
| Vishay | CCF07390RJKE36 | Metal Film Resistors 1/4watt 390ohms 5% | 10 |
| Vishay | CCF071K00JKE36 | Metal Film Resistors 1/4watt 1Kohms 5% | 14 |
| Vishay | CCF0710K0JKE36 | Metal Film Resistors 1/4watt 10Kohms 5% | 24 |
| NKK Switches | M2012SA1W03 | Toggle Switches ON-ON PC SPDT | 2 |
| Wurth Elektronik | 691214110002 | Fixed Terminal Blocks WR-TBL 300VAC 10A 2P Horizontal | 1 |
License
All project files are released under the terms of the CERN Open Hardware License - CERN OHL v.1.2.
Repository Infos
Owner: Jean-David Gadina - XS-Labs
Web: www.xs-labs.com
Blog: www.noxeos.com
Twitter: @macmade
GitHub: github.com/macmade
LinkedIn: ch.linkedin.com/in/macmade/
StackOverflow: stackoverflow.com/users/182676/macmadeParts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 10K | XS:Resistor-Vishay-CCF07 | R2, R3, R5, R6 |
| 4 | 1K | XS:Resistor-Vishay-CCF07 | R1, R4, R8, R10 |
| 4 | BC547 | XS:Package-TO-92-Line-Spacing-Lead-Form | Q1, Q2, Q3, Q4 |
| 2 | 390 | XS:Resistor-Vishay-CCF07 | R7, R9 |
| 1 | Conn_01x02 | XS:Connector-Wurth-Terminal-Block-2P-3.5mm-691214110002 | J1 |
| 1 | LOGO | XS:Logo-OSHW-5x5 | G*** |
| 1 | LOGO | XS:Logo-XS-5x5 | G*** |
| 1 | Q | XS:LED-T1-34-5mm | D1 |
| 1 | RESET | XS:Tactile-Omron-B3W-900X-X1X | SW2 |
| 1 | SET | XS:Tactile-Omron-B3W-900X-X1X | SW1 |
| 1 | ~Q | XS:LED-T1-34-5mm | D2 |
Questions
How big is the SR Latch PCB?
It measures 66 × 37 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SR Latch use?
21 parts, built around the BC547. 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 SR Latch KiCad files?
From the macmade/Electronics-Tutorials repository on GitHub, at the commit this page was made from: the board is SR Latch/SR Latch.kicad_pcb and its schematic Astable Multivibrator/Astable Multivibrator.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SR Latch design in my own project?
Its repository states no licence, so its author keeps all rights: ask macmade before reusing the design.
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