Notes concerning “Photovoltaic”

• Long distance radio 02020-07-17 (19 minutes)
• Copper salts 02020-09-21 (updated 02020-09-23) (8 minutes)
• Desiccant climate control 02020-10-27 (updated 02020-11-24) (31 minutes)
• A solar panel from an LED garden light 02020-11-17 (updated 02020-12-01) (5 minutes)