Running lights on a three-phase multivibrator. Scheme, description

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Running lights on a three-phase multivibrator. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands

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The effect of "running lights" appears only with a very definite alternation of lamps of several garlands. In the proposed version of the switching machine, three garlands are used, but each is composed, in turn, of several groups of lamps connected in parallel. As a result, a panel in the form of a square was assembled from all the lamps of the garlands, inside of which there was a six-ray "star" (Fig. 1). When the machine is turned on, the light "runs" along the sides of the square and diverges into rays inside it.

Fig.1 (click to enlarge)

The garland lamps are controlled by a three-phase multivibrator made on transistors VT1-VT3. The switching speed of the garlands depends on the ratings of the parts in the base transistor circuit. To facilitate the start of the multivibrator when the machine is turned on and the network, in one of the arms of the multivibrator (in this case, in the cascade on the transistor VT2), an additional capacitor C4 is installed, the capacitance of which must be at least 0,1 μF.

The machine is powered by a full-wave rectifier on diodes VD1-VD4. Filter capacitors C5-C7 are taken with a large capacity to obtain a more "clean" DC voltage, which is necessary for the stable operation of the multivibrator.

Transistors can be any of the KT815, KT817 series, but preferably with the highest possible current transfer coefficient. Capacitor C4 - MBM, the rest - K50-6. Resistors - MLT-0,125. All lamps for a voltage of 1 V and a current of 0,068 A. Others with a high voltage will do, but you will have to choose the supply voltage for them. For these lamps, the power source must provide a voltage of 9 ... 18 V at a load current of up to 1 A. Moreover, the lower the supply voltage, the lower the brightness of the lamps.

The basis of the design is a sheet of organic glass with a thickness of 5 ... 6 mm and dimensions of 475x475 mm, in which holes with a diameter of 9,4 mm are drilled for lamps - they are located in accordance with the figure. In the holes, the lamps are fixed with glue (for example, BF-2), and the lamp leads are connected with pieces of a mounting wire in insulation. To facilitate installation, and in the future it is easier to understand it, it is advisable to connect the lamps of each arm of the multivibrator with conductors of their own color. Lamp bulbs can be painted with colored zaponlak. In order to achieve a greater brightness of the glow of the resulting panel, a sheet of organic glass from the installation side is covered with white nitro enamel.

Strips of duralumin 3 ... 1 mm thick and 2 mm wide are attached to the ends of the sheet with M40 screws, forming the side walls of the structure. The transistors of the multivibrator are attached to three strips, as to heat sinks. And so that the collector circuits of the transistors are not interconnected, there should be a gap of 2 ... 3 mm at the joints of the strips.

Oxide capacitors are stapled to the bottom of the sheet with lamps, and resistors and capacitor C4 are mounted on racks with petals or on a small board. The power supply is assembled in a separate case, installed during operation behind the panel.

Y. Deripov

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