I built a variable power supply from an old laptop power supply and a buck-boost converter module.
Building a Variable Power Supply using Buck-Boost Converter Module and Old Laptop Power Supply
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Repairing a 5V 2A Wall Wart
Someone cut off and throw away a perfectly good wall wart.
Found: Broken Capacitor in An Old Speaker
Old speaker, broken capacitor.
Electronic Load
Arduino controlled DIY electronic load.
Large Solderless Breadboards
Two crappy breadboards make one slightly more convenient — but still crappy — large breadboard.
Failed Repair: HP Deskjet D1360
Old printer, new frustation.
Found: Cut Trace in DSO150
DSO150 stops showing waveforms. How could it be?
ACS712 Live Zero
Testing the ACS712 when no current is flowing.
Arduino UNO + ACS712
Reading ACS712 analog output using Arduino UNO.
Blue Pill I2C with INA219
I2C works okay for both STM32F103C8T6 and CS32F103C8T6.