Science: Build a science aparatus, a measuring device or a project to show/explain science principles. Examples could be: an amplifier that can detect action potentials of neurons, a project that shows different properties of waves such as reflection, refraction or wave interference, or an instrument to measure different physical quantities such as mass, temperature, time, etc.
Restoration/repair: Restore or repair electronic equipment, it could be an old bakelite vacuum tube radio, vintage test equipment, or any other electronic equipment that needs some love to work again. The restoration could include fixing not just the electronics but also the chassis or aesthetics.
I would love to see a low to no cost build of a small battery toothbrush shaped and/or hand held spot welder (maybe using capacitors) like people building battery packs use in videos I've seen on YouTube. Maybe a bit stronger as I want to use it for 1/16 soft metal (but not really on the before mentioned battery packs) I'm disabled and tinker when I feel well enough in my home because I don't feel safe enough in workshop using a mig welder.
Another idea for future - Electronic Art such as freeform circuitry. There was a presentation I was fortunate enough to attend recently by Mohit Bhoite that has been posted on YouTube (great video but 25 minutes long): https://www.youtube.com/watch?v=LqVFxNFGNbc
The topic could be expanded to be more than freeform circuitry - see for example the great entries for PiCasso.
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