A souvenir depicting fairy-tale “the Firebird” with the use of LEDs, can make even novice hams. The details of the electric circuit, except the LEDs are placed inside a plastic soap dish suitable sizes, are the basis. Two red (or orange) led, is inserted in place of eyes, connect to the unsymmetrical multivibrator, and seven flashing LEDs in the tail feathers twinkle themselves. Details of the scheme: VT1, VT2, R1, R2, C1 is located on the PCB about the size of 40×20 mm, which is fastened inside the base by two screws M4. The power switch (microtubles) is displayed on the top cover.NO WORSE THAN FACTORY
Brush motor run relatively short. And if not in stock new, home “helper” comes the forced inaction. Meanwhile, a new brush it is easy to make from coal cores extracted from the life-expired elements of “373.” Round carbon rod I attach a file of rectangular cross section (see Fig.). Then a jig saw or saw Read more…
Chandelier, sconce or a floor lamp in every house. They often burn on several lamps. Do I need it? Not always. And here is the owner of such a lamp becomes involuntary “waster” of electricity. But only because turning off “unnecessary” lights are not available. However, you can add a third wire. But in flats with concealed electrical wiring immediately raises a problem: where to spend it. And that’s where the master comes home… diode.
Creating some kind of mechanism or tool, the person usually by its name defines its main functional purpose. So, saw, saws, drill — sowing, the hole punch punch holes, and, say, a wrench used for screwing or unscrewing the nuts.
Rare design can be build without the use of welding, particularly electric arc. This is why a good welder is a dream for many designers and enthusiasts. The “heart” of it — the welding transformer, which will be discussed. Winding step-down transformer (Fig. 1), connected to the original circuit (Fig. 2) provide arc stability. For welding use electrode Ø 3 mm, designed for AC current. (In the forced mode of the transformer it is possible
