Justin Giles-Clark shows off his magical music box using CMOS and 555s:
Simple circuit using 555s for a 3minute monostable oscillator to time the clockwork spring. Another 555 provide a astable oscillator with about an 1 hertz period clocking a 4017 decimal ring counter for 6 counts. Created in 2002.
Via contact form.
Check out the video after the break.