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Capacitor leakage tester

Fyfar·capacitor_leakage_tester·kicad/leakage_tester.kicad_pcb

Capacitor leakage tester PCB layout, top view — open source RP2040/RP2350 board by Fyfar

About the Capacitor leakage tester PCB

Capacitor leakage tester is an open source RP2040/RP2350 PCB design by Fyfar, published on GitHub under the MIT license. It is a 2-layer board measuring 100 × 67.5 mm, with 61 components from 39 distinct parts.

Its main chip is the RP2040-ZERO, from the RP2040/RP2350 family. Other key parts include the AMS1117-5, XL6007 and AD8605. By type, the board carries 23 resistors, 12 capacitors, 7 diodes, 6 transistors, 4 ICs and 3 connectors.

It belongs with the test & measurement and displays & leds designs in this gallery.

From the project

A fun, DIY project to build a high-sensitivity capacitor leakage current meter. This device is a great way to learn about electronics and build a useful tool for your workbench. It's not a professional-grade instrument, but it's perfect for hobbyists who want to explore the inner workings of capacitors and test their quality.

A DIY high-sensitivity capacitor leakage current meter. Applies a selectable test voltage to a capacitor under test and measures the resulting leakage current down to the microamp range.

KiCAD schematic and PCB files are in the kicad/ directory.

Built with PlatformIO and the Arduino framework (Earle Philhower RP2040 core).

- [x] Schematic design - [x] PCB layout - [x] Firmware (core measurement loop) - [ ] Pass/fail logic - [ ] Testing & calibration - [ ] Documentation

Main components on the Capacitor leakage tester

AMS1117-5XL6007RP2040-ZEROAD8605

Capacitor leakage tester bill of materials (BOM)

61 components, 39 distinct parts.

QtyPartRefs
1
AMS1117-5
U1
1
XL6007
U2
1
RP2040-ZERO
U3
1
AD8605
U4
4
2N7002
Q1, Q2, Q3, Q4
2
2N3904
Q5, Q6
1
Encoder
J1
1
LCD
J2
1
ADS1115 ADC
J3
1
Battery 2s
BT1
1
200mA
F1
2
Relay_SPDT
K1, K2
1
DUT
TP1
4
BAT46W
D1, D2, D3, D7
2
1n4148
D4, D6
1
RED
D5
1
33uH
L1
6
0.1u
C1, C2, C4, C7, C10, C11
2
1u
C3, C5
1
16v 47u
C6
Show 19 more
QtyPartRefs
1
100v 4.7u
C8
1
0.1u
C9
1
0.22u
C12
1
6.8k
R1
1
3.3k
R2
2
100k
R3, R8
1
4.7k
R4
4
10k
R5, R7, R10, R12
1
14.2k
R6
1
8.4k
R9
1
5.2k
R11
1
2.6k
R13
3
2.2k
R14, R16, R22
2
3k
R15, R20
1
2.8k
R17
1
1k 1%
R18
1
10 1%
R19
1
56k
R21
1
100
R23

Capacitor leakage tester design files

The KiCad project lives in the Fyfar/capacitor_leakage_tester repository on GitHub; these links point at the commit this page was built from.

Capacitor leakage tester: common questions

What microcontroller does the Capacitor leakage tester use?

The Capacitor leakage tester is built around the RP2040-ZERO, from the RP2040/RP2350 family.

How big is the Capacitor leakage tester PCB?

The Capacitor leakage tester measures 100 × 67.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Capacitor leakage tester?

61 components, from 39 distinct parts. The full bill of materials is listed on this page.

Where can I download the Capacitor leakage tester design files?

From the Fyfar/capacitor_leakage_tester repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Capacitor leakage tester design in my own project?

Yes, under the terms of its MIT license, which Fyfar chose for the repository.

Can I test firmware for the Capacitor leakage tester without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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