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 find this circuit in a 1980s documentation. The integrated circuit used is unusual today. The...
This high voltage stage has a behavior like to a 12AU7 tube according to the 1975 publication. The transistors...
The circuit with a common operational amplifier uses a zener as a reference. The circuit is from...