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When I was about five years old, I learned that it is not wise to connect a flashlight bulb directly to mains power, even though it is possible to attach the cord of a 4.5-volt LEGO motor to the bulb with a piece of tape, and the other end of the wire can be plugged into the cord of a radio cassette recorder. Luckily, I inserted the plug into the wall socket last while conducting the experiment. Digital electronics and embedded systems are easier for me than analog circuits.
See also my electronics projects for old computers.
There are many interesting circuits and electronics related articles at ePanorama.net.