This flashlight project with a blinking light that makes it easy to find was found in the January 1990 issue of Radio Electronics magazine. The light uses a common light bulb.
This 80's circuit can be made with current comparators. Rectification accuracy is 1% DC up to 100...
This circuit is from old documentation but can be applied to modern equivalent components. The...
With this circuit it is possible to raise the characteristics of a transistor by checking its gain...