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.
With the figure circuit it is possible to control the amount of heat generated by the heating...
This Texas Instruments circuit is from the 80's. However, it can be implemented with modern...
In the figure we have a circuit that allows us to obtain a variable voltage of approximately 0.5 to 25 V...