The 555 timer was originally designed in 1970, and since then a CMOS version has
come out, along with versions from other makers designed to run at higher
speeds, lower voltages, and lower power. People have?built all kinds of circuits
from this venerable, versatile, but?relatively simple timer. What can you build?
Jeri Ellsworth has started a 555 timer contest.
?Steve Greenfield AE7HD
Steven AE7HD