2 layers61 × 55.9 mm
2 layers9 × 47.3 mm
MinimumContChecker
akita11/MinimumContChecker- Size
- 9 × 47.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 37
- Nets
- 18
- Pads
- 70
- Tracks, vias
- 184, 20
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 26 Jun 2026
- Updated
- 6 Aug 2026
Overview
MinimumContChecker is an open-source printed circuit board by akita11, from the akita11/MinimumContChecker repository on GitHub, published under the MIT licence. It is a 2-layer board of 9 × 47.3 mm with 37 parts on 18 nets, routed with 184 tracks and 20 vias.
It is built around the LM358 and BAT54S. Its parts include 11 resistors, 10 connectors, 3 diodes, 1 capacitor and 1 IC.
Main components
2README
README.mdMinimim Cont Checker
使い方
LR41ボタン電池を2個、このように入れます。向きに注意してください。2個とも、基板側が負極（少し小さい円形電極がある側）、外側が正極です。
上部の電源スイッチを押すと緑LEDが点灯します。
2本のテスターリードをチェック箇所にあて、2点が短絡（約25Ω以下）していると、ブザーが鳴り、黄LEDが点灯します。
使用後は電源スイッチをもう一度押してオフにしておいてください。
※2個の電池の電圧の合計が2V程度になるまで使えます。 また端子間の開放電圧は約0.2Vです。
Author
Junichi Akita (akita@ifdl.jp, @akita11)
Parts
37| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | Conn_01x01 | akita:Pad_SMD1.6mm | J3, J4, J5, J6, J7, J8, J9, J10 |
| 3 | 1k | Resistor_SMD:R_0603_1608Metric | R3, R5, R11 |
| 3 | 47k | Resistor_SMD:R_0603_1608Metric | R6, R7, R8 |
| 2 | Conn_01x01 | akita:Pad_SMD1.6x3.2mm | J1, J2 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D2, D3 |
| 2 | LR41 | akita:BAT_LR41 | BT1, BT2 |
| 1 | 0.033 | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 100k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 20k | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 3.3k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 75 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | BAT54S | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | LM358 | Package_SO:TSSOP-8_3x3mm_P0.65mm | U1 |
| 1 | SW_SPDT | akita:SW_B22E60 | SW1 |
| 1 | Speaker | akita:BZ_9mmSQ | LS1 |
The 30 most common of 37 parts.
Questions
How big is the MinimumContChecker PCB?
It measures 9 × 47.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MinimumContChecker use?
37 parts, built around the LM358 and BAT54S. 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 MinimumContChecker KiCad files?
From the akita11/MinimumContChecker repository on GitHub, at the commit this page was made from: the board is MinimumContChecker.kicad_pcb and its schematic MinimumContChecker.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MinimumContChecker design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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