Sirens are inexpensive ($3.75) sound installations. They are public, site-specific, solar powered and easy to assemble.
Parts:
Solar panel – $0.55
40106/74C14 IC – $0.50
1uf capacitor – $0.20
Photocell – $1.15
Speaker – $1.10
Magnet – $0.75
Inspired by Evan Roth’s LED throwies, Laura Plana Gracia’s solar sound bots workshops, and Max Neuhaus.
