Here is a compiled list of links related to building test equipment for a home-lab. No particular order, just a quick way to find interesting links.
- Impedance analyzers https://www.nutsvolts.com/magazine/article/a_low_cost_rf_impedance_analyzer
https://www.industrial-electronics.com/elektor_303_10.html
https://www.elektormagazine.com/labs/remake-lcr-meter
https://www.ti.com/tool/TIDA-060029
http://ijiet.com/wp-content/uploads/2017/01/18.pdf
http://web.mit.edu/6.101/www/reference/M3LCR_manual.pdf
- Inductor saturation tester
https://hackaday.com/2014/09/23/making-an-inductor-saturation-current-tester/
http://www.vk2zay.net/article/200
https://www.eevblog.com/forum/projects/inductor-saturation-tester-alternative-route-to-dump-the-excess-energy/
- Variable isolation transformer
https://lajtronix.eu/2021/04/29/diy-variable-isolation-transformer/
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Power supply https://www.instructables.com/33-DIY-Power-Supplies/
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Voltage reference https://www.nutsvolts.com/magazine/article/build_a_01_accurate_voltage_reference
http://essentialscrap.com/vref/index.html
https://hackaday.com/2015/03/23/build-a-precision-voltage-reference-box/
- Electronic load https://hackaday.io/project/164115-homemade-dc-electronic-load
https://www.instructables.com/DIY-Adjustable-Electronic-DC-Load/
https://www.codrey.com/electronic-circuits/simple-electronic-dc-load/
https://github.com/reivax-boucoi/Electronic_Load
- Transistor curve tracer
https://www.eddybergman.com/2017/06/simple-but-effective-transistor-curve.html
https://circuitcellar.com/research-design-hub/create-your-own-i-v-curve-tracer/
https://www.paulvdiyblogs.net/2021/03/building-curve-tracer-version-3.html
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Noise generator https://www.eddybergman.com/2020/05/synthesizer-build-part-31-noise-module.html
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Distortion analyzer
https://www.nutsvolts.com/magazine/article/build-a-basic-audio-distortion-analyzer
- FFT Spectrum analyzer
https://hackaday.io/project/182080-diy-simple-fft-spectrum-analyzer
https://www.instructables.com/DIY-FFT-Audio-Spectrum-Analyzer/