2 layers49.5 × 30 mm
Business card round
t-mullin/Business_Card
Repo for the Stepped tone generator business card.
11 parts1
2 layers58.4 × 31.8 mm
Business card
t-mullin/Business_Card1Repo for the Stepped tone generator business card.
- Size
- 58.4 × 31.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 11
- Pads
- 34
- Tracks, vias
- 62, 0
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 22 Jun 2021
- Updated
- 23 Aug 2022
Overview
Business card is an open-source printed circuit board by t-mullin, from the t-mullin/Business_Card repository on GitHub. It is a 2-layer board of 58.4 × 31.8 mm with 12 parts on 11 nets, routed with 62 tracks and 0 vias.
Its parts include 2 capacitors, 1 resistor, 1 IC and 1 switch. It belongs with the retro computing and games boards of this library.
README
README.mdSTG Business Card
UPDATE!
I am working on some updates to the STG Business Card project.
- Adding additional options of form-factor/materials.
- Adding Through-Hole and SMD versions.
- Reworking of the project structure.
Motive
The motive behind this project is to provide to prospective employers an example of my pcb work in a form factor that is easy for them to carry around. I came up with the idea of putting a simple Stepped Tone Generator onto a PCB the size of a business card after watching a video from Look Mum No Computer, where he builds an Atari Punk Console (Stepped Tone Generator).
PCB Design
Using the same instructables guide from BrownDogGadgets, I used KiCad to draw up the schematic and designed a PCB to go with it. The PCB is a 2-layer design with through-hole components. Below are pictures of the 3D model and the PCB layout in KiCad.
Bill of Materials
| Description | Ref | Component Value | Part # | Link |
|---|---|---|---|---|
| Resistor | R1 | 1K | CFR-25JB-52-1K | Digi-key |
| Capacitor | C1, C2 | 0.22u | K224M20X7RF53H5 | Mouser |
| 556 Timer | U1 | 556 | NE556N | Mouser |
| IC Socket | U1 | 14 Pin DIP | ICS-314-T | Digi-Key |
| Photoresistor | PR1, PR2 | 1k - 10k | 161 | Adafruit |
| Trimmer Resistor | TR1 | 5k | 3386T | Mouser |
| Speaker | LS1 | 8 ohm | 1890 | Adafruit |
| Switch | SW1 | SPDT | 805 | Adafruit |
| 9V Battery Clip | Batt/9V | 9V | 235 | Mouser |
Assembly Order
For ease of assembly, start with the lower profile components and work up to the higher profile components.
I assembled the circuit in this order:
- Resistor and Photoresistors
- IC Socket
- Capacitors
- Switch
- Potentiometer
- Speaker and Battery Clip
- IC
Assembled Circuit
Below is an assembled STG circuit. A demo of the circuit can be found here: STG Demo
Postmortem
Overall, I happy with the final product. However, I may add an additional PCB, to this project, that swaps out the photoresistors for potentiometers. Alternate version has been added. However, it is untested.
For the alternate design, below are the parts that have changed.
- TR2 & TR3 = 500k ohms
- C1 & C2 = 0.01 uF
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | c_gen | capacitor_general:c_gen | C1, C2 |
| 2 | photores_gen | resistor_general:photores_gen | PR1, PR2 |
| 1 | LOGO | QR_CODE:qrcode_github | G*** |
| 1 | NE556N_gen | NE556N:DIP254P762X508-14 | U1 |
| 1 | Speaker | speaker_general:speaker_gen | LS1 |
| 1 | TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | TestPoint:TestPoint_THTPad_1.5x1.5mm_Drill0.7mm | - |
| 1 | TestPoint_THTPad_D1.5mm_Drill0.7mm | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | +9V |
| 1 | r_gen | resistor_general:r_gen | R1 |
| 1 | slide_switch_general | slide_switch_general:slide_switch_general | SW1 |
| 1 | trimpot_gen | resistor_general:trimpot_gen | TR1 |
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Questions
How big is the Business card PCB?
It measures 58.4 × 31.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Business card use?
12 parts. 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 Business card KiCad files?
From the t-mullin/Business_Card repository on GitHub, at the commit this page was made from: the board is archive/business_card.kicad_pcb and its schematic Rounded/THT/business_card.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Business card design in my own project?
Its repository states no licence, so its author keeps all rights: ask t-mullin before reusing the design.