I had an idea earlier for earbuds that use micro movements to increase battery life or charge in ear without harmful RF signals that can damage the ears and brain. Here is the idea in more detail: Bass-driver regeneration (dual-coil):
Driver motion generates electricity the way dynamic microphones do.
Adds +20–45 minutes.
• Tap-to-charge piezo harvesting:
User taps and interactions convert into charge via piezo materials.
Adds +3–10 minutes.
• Jawbone/singing vibration harvesting:
Speaking, humming, and singing create vibrations captured by a piezo sensor.
Adds +5–10 minutes (or up to +45 minutes for frequent singing).
• Walking/running kinetic harvesting:
Head movement harvested by a micro pendulum-magnet or flex-piezo strip.
Adds +10–60 minutes depending on activity level.
• Echo micro-harvesting:
Small reflected sound vibrations can be captured.
Adds +1–3 minutes.
• Supercapacitor smoothing:
All micro-energy sources feed into a tiny supercap before charging the battery.
• Ultra-low-power architecture:
Efficient DSP and Bluetooth LE make the regenerated power more effective. just an idea but idk
