If you can fabricate single-sided circuit boards at home you can build this digital oscilloscope. It uses mostly through-hole components with just a couple of surface mount chips to contend with.

Would you like to have a small digital oscilloscope? Do you have a spare BlackPill (STM32F401) board and a TFT display laying around? [tvvlad1234] presents us with a simple and educational digital ...

An oscilloscope makes the invisible world of ... Want to see sound waves from a microphone? Watch digital signals move between chips? Understand why your DIY project isn't working?