Notes from James: The timer circuit I used is an astable multivibrator based on the popular 555-timer chip. The boards built in the episode used a CMOS version. In all measurements, the timer capacitor had a 1 microfarad capacitor and 10 volt rating. While not shown in the episode, I did build boards with 1206, 0805, 0603, 0402, and 0201. I decided only to show the 1206 and 0201 since they had the most considerable difference.
Bill of Material:
|555 Timer - SOIC8 - ICM7555ISA||Maxim|
GRM033C81A105ME05D - 0201, 10V, 1uF, X5R Ceramic Capacitor
GRM319R71A105KA01D - 1206, 10uV, 1uF, X7R Ceramic Capacitor