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.
The circuit shown in the figure is a simple test of NPN and PNP transistors. The circuit detects the...
This circuit is from an old American documentation, from 1977, but it can be implemented with more...
Found in a manufacturer documentation from the 90s, this circuit makes use of period components. The...