Color-musical installation with number-pulse control of trinistors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands
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The color-musical installation with the number-pulse control of trinistors ensures the convergence of the dynamic ranges of the brightness of the lamps and the level of the sound signal, as well as obtaining light compensation channels without any special electronic devices.
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The power of each of the three main channels of the installation is 300 W, each of the light compensation channels is 100 W, the nominal input signal level is 0,3 .. 0,5 V.
The input signal is fed to the crossover filters of the device through the level control - a variable resistor R1. The high-frequency band of the signal spectrum is selected by the L1C1 filter, the mid-frequency band by the L2C2 filter, and the low-frequency band by the L3C3 filter. Negative polarity voltages, smoothed by capacitors C4-C6, through resistors R4-R6 are supplied to the bases of transistors V9-V11, which act as adjustable resistors that determine the moment of operation of the devices for comparing cells A1-A3 control trinistors V13-V15.
Each of the cells (the diagram shows one of them - A1) consists of a blocking generator (1V5) and a comparison device (1V1, 1V2). Diode 1V2 synchronously with the frequency of the network is supplied with an exponentially changing voltage generated by the generator on the transistor V8. This voltage is compared with the voltage across the 1V1 diode, which is determined by a divider consisting of resistors 1R1, 1R2 and the emitter-collector section of transistor V9. When the voltages are equal, the diode 1V2 opens, and 1V1 closes. As a result, the circuit of the lower (according to the scheme) half of the winding II of the 1T1 pulse transformer turns out to be closed, and the upper half is open, and the blocking generator begins to generate pulses that, through the winding I, enter the control electrode of the trinistor V13.
Diode 1V4 limits the surge voltage on the winding III, which occurs when the transistor 1V5 is closed. The initial glow of the lamps is set with a tuning resistor 1R2.
The exponential voltage generator is based on a transistor switch. The voltage of the synchronizing winding III of the power transformer T1, rectified by the diodes VI-V4, closes the transistor V8, and the voltage across the capacitor C7 begins to increase exponentially. At the end of each half-cycle of the mains voltage, transistor V8 opens with current flowing through resistor R7, and the capacitor quickly discharges through the low resistance of the saturated transistor.
Coils L1-L3 are wound with wire PEV-1 - 0,1 on ferrite (600NN) rods with a diameter of 8 and a length of 20 mm. The first two of them contain 2000, the third - 3600 turns. The magnetic circuits of pulse transformers are ferrite (1000NN) rings of size KM x 7 x 4. Windings I and III each contain 75, and winding II - 2 x 50 turns of wire PELSHO - 0,1. The power transformer is wound on a magnetic circuit Ш20 x 25. Windings I ( 1800 turns) and III, (40 turns) are wound with PEV-2 wire - 0,2, winding II (90 turns) - with PEV-2 wire - 0,41.
The switch transistor (V8) must have a static current transfer coefficient h21e = 40...50. The light part of the installation is made in the form of four spotlights. Three of them are the main ones (blue, green and red), the fourth one is light compensation (yellow). The total power of H2, H4, H6 lamps in each of the main channels is up to 300 watts. Three lamps (HI, NC, H5) of 100 W each are installed in the light-compensating spotlight.
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