Despite being found in a 1980 publication, this circuit uses components that can still be found easily. The circuit feeds an array of LEDs that run randomly, stopping at one.
We found this project in a 1982 publication. What we have here is an audio signal relay trigger, which...
We found this circuit in an 80's Radio Shack publication. The circuit uses a company buzzer, but...
This circuit was found in a 90s Popular Electronics. It uses a varicap that admits equivalents. The...