This circuit was published in the December 1987 Radio Electronics magazine. It uses two 555s to drive 6 flashing LEDs.
This basic configuration can be found in a lot of articles on this site. In this case, the relay...
This circuit was found in a 1997 publication, but it uses few common components and is very...
This circuit prevents the passage of frequencies in a range starting at 1 kHz and can be adjusted...