2 layers41.9 × 99.1 mm
2 layers
LSDA paper
DIY-Nabra/dlopper4A control circuit based on light differentials
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 81
- Nets
- 25
- Pads
- 188
- Tracks, vias
- 200, 0
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Feb 2025
- Updated
- 19 Apr 2025
Overview
LSDA paper is an open-source printed circuit board by DIY-Nabra, from the DIY-Nabra/dlopper repository on GitHub, published under the BSD-2-Clause licence. It is a 2-layer board with 81 parts on 25 nets, routed with 200 tracks and 0 vias.
It is built around the LM324 and BC547. Its parts include 46 resistors, 8 capacitors, 6 diodes, 4 transistors and 2 ICs.
Main components
2README
README.mdDlopper
This is the Dlopper, a control circuit.
It outputs gates and control voltage due to light differentials.
Download the PDF from here
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | 100k | diy-nabra:r3 | R1, R1, R2, R2, R5, R5, R8, R8, R9, R9, R10, R10, R21, R21, R24, R24 |
| 12 | 10k | diy-nabra:r3 | R4, R4, R7, R7, R11, R11, R18, R18, R19, R19, R20, R20 |
| 4 | 10uF | diy-nabra:cel1 | C1, C1, C3, C3 |
| 4 | 1k | diy-nabra:r3 | R15, R15, R17, R17 |
| 4 | 1uF | diy-nabra:cpoly105 | C4, C4, C5, C5 |
| 4 | 22k | diy-nabra:r3 | R14, R14, R16, R16 |
| 4 | 68k | diy-nabra:r3 | R22, R22, R23, R23 |
| 4 | BC547 | diy-nabra:qnpn | Q1, Q1, Q2, Q2 |
| 4 | LED | diy-nabra:led | D1, D1, D2, D2 |
| 2 | 0 | diy-nabra:r3 | R7, R7 |
| 2 | 1N4001 | diy-nabra:power-1n4001 | D3, D3 |
| 2 | B25k | diy-nabra:wnob | RV1, RV1 |
| 2 | Battery | diy-nabra:wobelisk | BT1, BT1 |
| 2 | CompBot | diy-nabra:wsqout | TP1, TP1 |
| 2 | CompTop | diy-nabra:wsqout | TP3, TP3 |
| 2 | LDR-BOT | diy-nabra:cadsulfide_sm | R3, R3 |
| 2 | LDR-TOP | diy-nabra:cadsulfide_sm | R6, R6 |
| 2 | LM324 | diy-nabra:dip14 | U1, U1 |
| 2 | Out | diy-nabra:wsqout | TP2, TP2 |
The 76 most common of 81 parts.
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Questions
What parts does the LSDA paper use?
81 parts, built around the LM324 and 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 LSDA paper KiCad files?
From the DIY-Nabra/dlopper repository on GitHub, at the commit this page was made from: the board is LSDA_paper/LSDA_paper.kicad_pcb and its schematic LSDA_PCB/LSDA_PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the LSDA paper design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).