Control screen for dynamic lighting installation. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music settings
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Along with the main screen device, it is advisable to equip both the color synthesizer and the SDU with a small control screen that duplicates the image of the main one and is installed near the control panel. The control screen usually uses low-voltage low-power lamps and is arranged in the same way as in the main.
The control screen uses CM10 lamps (EL2, see diagram), included in the collector circuit of additionally introduced low-power transistors (VT1). The number of additional transistors is equal to the number of groups of lamps (in SDU - the number of channels). The diagram shows a modification of one of the channels.
As soon as the trinistor VS1 opens and one of the main groups of lamps EL1 turns on (one is conditionally shown in the diagram), the transistor VT1 opens and the lamp EL2 of the control screen lights up. The diode VD1 protects the base circuit of the transistor VT1 from breakdown by the anode voltage of the closed trinistor VS1 (it is equal to the amplitude of the mains if the lamps of the main screen are powered from the mains).
The CM10 lamp can be replaced with another or several connected in series, you just need to keep in mind that the total current through the lamp circuit should not exceed 200 mA, and the transistor supply voltage must be equal to the total load voltage plus the transistor saturation voltage (the supply voltage should not be more than the maximum allowable for a transistor).
Author: A. Shevchenko; Publication: cxem.net
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