Running lights on 8 channels. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Running lights on 8 channels. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Lighting

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An 8-channel automatic installation "Running Lights" is proposed, which allows for greater dynamics of lighting effects.

The peculiarity of this system lies in the way the lamps are connected in garlands. The functional diagram of the installation is shown in Fig.1. In this scheme, the lamps are connected in a matrix circuit and connected to the mains through two groups of electronic switches. The first group of keys is controlled by the first four channels of the control circuit, and the second by the other four channels.

Running lights on 8 channels. Functional diagram of the installation
Fig.1. Functional diagram of the installation

Thus, it is possible to move the lights both vertically and horizontally. That is, if the first group of keys is closed, and the second one works according to the "running fire" program, the rows of luminous lamps move vertically. If the second group of keys is closed, and the first one works according to the "running fire" program, the rows of lamps move horizontally. When the "running fire" signal is simultaneously applied to both groups of keys, the lights will move diagonally.

Thus, by applying various combinations of control signals to both groups of keys, it is possible to obtain various combinations of lighting effects determined by the program for flashing the PROM. One version of the program is shown in the table.

Schematic diagram of the light effects machine is shown in Fig. 2 (control part) and 3 (power part).

Running lights on 8 channels. Control part of the plant
Fig.2. Schematic diagram: control part

Running lights on 8 channels. Power part of the installation
Fig.3. Schematic diagram: Power section

Running lights on 8 channels. Power Supply
Fig.4. Power Supply

The master oscillator (Fig. 2) is assembled on the DA1 timer chip (KR1006VI1). Chips DD1 and DD2 form a binary counter enumerating ROM addresses DD3. The above scheme for connecting counters provides an eight-fold repetition of each program recorded in the ROM (64 in total). Output keys on transistors VT1...VT8 control power modules UZ1...UZ8. A drawing of the printed circuit board (12x7 cm) of the machine is shown in Fig. 5.

Running lights on 8 channels. Printed circuit board
Fig.5. Printed circuit board

The power supply (Fig. 4) does not have any features and must provide a current of 1 A at a voltage of 5 V. Optocoupler thyristor modules of the MT02-25 type are used as power switches, the design of which provides galvanic isolation of the control circuit from power circuits, as well as allows you to install them on one common radiator. The diagram for connecting lamps in a garland is given in Fig. 6, and the diagram for connecting garlands is shown in Fig. 7.

Running lights on 8 channels. Scheme of connecting lamps in a garland
Fig.6. Scheme of connecting lamps in a garland

Running lights on 8 channels. Garland connection diagram
Fig.7. Garland connection diagram

When using MT02-25 power modules, the power of lamps connected to one channel can reach 3 kW, and for MT0T0-80 modules - up to 10 kW per channel.

Author: L. Lysenko, Bobruisk; Publication: radioradar.net

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