QA403-Impedance-Fixture-V2
About the QA403-Impedance-Fixture-V2 PCB
QA403-Impedance-Fixture-V2 is an open source PCB design by excitonlabs, published on GitHub under the CC0-1.0 license. It is a 2-layer board measuring 74.5 × 44 mm, with 27 components from 8 distinct parts.
By type, the board carries 16 resistors, 6 connectors and 5 jumpers.
It belongs with the audio and test & measurement designs in this gallery.
From the project
A test fixture for the QuantAsylum QA403 for measuring impedance with optional attenuation before the analyser inputs to support high power testing
A test fixture for the QuantAsylum QA403 for measuring impedance based on Matt's blog posts: https://quantasylum.com/blogs/news/speaker-impedance-measurements https://quantasylum.com/blogs/news/measuring-input-impedance
This is version two of the text fixture and adds optional attenuation before the inputs to the analyser optional current sense resistor if you just want to use the board for connectivity.
QA403-Impedance-Fixture-V2 bill of materials (BOM)
27 components, 8 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | NMJ6HCD2_WITH_SCREW_TERM | Dual_Jack_6.35mm_Neutrik_NMJ6HCD2_Horizontal_TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J1, J2 |
| 4 | Conn_Coaxial | 52211232 | J3, J4, J5, J6 |
| 5 | SolderJumper_2_Open | SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1, JP2, JP3, JP4, JP5 |
| 1 | DNP | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1 |
| 1 | DNP | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 1 | DNP | R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | DNP | R_SQM_20W_Resistor_45mm_20mm_12mm | R4 |
| 12 | R | R_1206_3216Metric | R5, R6, R7, R8, R9, R10, R11, R12 +4 |
QA403-Impedance-Fixture-V2 design files
The KiCad project lives in the excitonlabs/QA403-Impedance-Fixture-V2 repository on GitHub; these links point at the commit this page was built from.
QA403-Impedance-Fixture-V2: common questions
How big is the QA403-Impedance-Fixture-V2 PCB?
The QA403-Impedance-Fixture-V2 measures 74.5 × 44 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the QA403-Impedance-Fixture-V2?
27 components, from 8 distinct parts. The full bill of materials is listed on this page.
Where can I download the QA403-Impedance-Fixture-V2 design files?
From the excitonlabs/QA403-Impedance-Fixture-V2 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the QA403-Impedance-Fixture-V2 design in my own project?
Yes, under the terms of its CC0-1.0 license, which excitonlabs chose for the repository.
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