2 layers43.9 × 27.7 mm
2 layers26.9 × 29 mm
Descope
konspyre/electroscope1Toy electroscope for visualizing charge - KiCad source files, gerbers and bill of materials
- Size
- 26.9 × 29 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 19
- Nets
- 16
- Pads
- 46
- Tracks, vias
- 56, 2
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 22 Apr 2014
- Updated
- 14 Apr 2019
Overview
Descope is an open-source printed circuit board by konspyre, from the konspyre/electroscope repository on GitHub. It is a 2-layer board of 26.9 × 29 mm with 19 parts on 16 nets, routed with 56 tracks and 2 vias.
Its parts include 6 resistors, 6 transistors and 4 diodes.
README
README.mdToy Electroscope
Elsewhere: Check out the through-hole version of this electroscope
This is an Electroscope done up using a design from Alan "vk2zay" Yates in his Making Electrets video.
Postings
Direct fabrication
Latest/updated (use this one): Updated electroscope (OSHPark shared project)
Older: Old electroscope (OSHPark shared project)
Bill of Materials
This BOM specifies the amount needed for one board.
| Quantity | Description | Digikey Part Number | Board Placement |
|---|---|---|---|
| 3 | 2N3906 | MMBT3906FSCT-ND | Right (label: 2N3906) |
| 3 | 2N3904 | MMBT3904FSCT-ND | Left (label: 2N3904) |
| 2 | 100 ohm resistor (0603 imperial) | 1276-5038-1-ND | Bottom (label: 100 ohm) |
| 2 | 100k ohm resistor (0603 imperial) | 1276-5110-1-ND | Middle (label: 100k ohm) |
| 2 | 1M ohm resistor (0603 imperial) | 311-1.00MHRCT-ND | Top (label: 1M ohm) |
| 1 | 9v female PCB mount snap | BSPCF | 9V+ terminal (verify before soldering by attaching to a 9V battery -- reworking afterwards is difficult without specialized tools/materials) |
| 1 | 9v male PCB mount snap | BSPCM | 9V- terminal (verify before soldering by attaching to a 9V battery -- reworking afterwards is difficult without specialized tools/materials) |
LEDs
Pick either the 3mm LEDs or surface mount 0805s
| Quantity | Description | Digikey Part Number | Board Placement |
|---|---|---|---|
| 2 | 3mm LEDs | (Red: 160-1704-ND / Green: 160-1958-ND | Bottom (verify orientation before soldering!) |
| 2 | 0805 imperial LEDs | (Orange: 350-2040-1-ND / Yellow: 350-2041-1-ND | Bottom (verify orientation as with the 3mm LEDs) |
Antenna
There is no part for this, so you'll have to make your own. A simple loop soldered together usually works well (the twisted termination used in the previous photos is just a fancy flourish).
Optional
Shielding: I experimented with a three-layered combination of kapton/polymide tape (to cover the BJTs), copper tape (edge to edge, touching the exposed ground edges), and then another layer of kapton/polymide to keep the copper looking nicely unscuffed by oils (from fingers).
License
Original design/schematic by Alan "vk2zay" Yates
Parts
19| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 2N3904 | SOT23_INV | Q2, Q4, Q6 |
| 3 | 2N3906 | SOT23_INV | Q1, Q3, Q5 |
| 2 | 100KΩ | SM0603 | R3, R4 |
| 2 | 100Ω | SM0603 | R1, R6 |
| 2 | 1MΩ | SM0603 | R2, R5 |
| 2 | ANTENNA | ANT | ANT1, ANT2 |
| 2 | LED | LED-3MM | D3, D4 |
| 2 | LED | LED-0805 | D1, D2 |
| 1 | BATTERY | BSPCMF-9VBATT-SNAP | BT1 |
Questions
How big is the Descope PCB?
It measures 26.9 × 29 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Descope use?
19 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 Descope KiCad files?
From the konspyre/electroscope repository on GitHub, at the commit this page was made from: the board is descope.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Descope design in my own project?
Its repository states no licence, so its author keeps all rights: ask konspyre before reusing the design.
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