Color and music installation. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Color and music installation. 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 principle of operation of the installation is based on the separation of the spectrum of the audio signal by frequency.

(click to enlarge)

To achieve greater diversity and richness of the color pattern, instead of the widespread three-color system, it uses a four-color system (red, yellow, blue and purple). The spectrum of the input signal is distributed between the channels approximately as follows: red - up to 400 Hz, yellow - 400..3000 Hz, blue - 3000-6000 Hz, violet - above 6000 Hz. Connect the unit directly to the output of the AF amplifier in parallel with the loudspeaker.

The audio frequency signal enters the installation channels through an emitter follower on transistor V1. The signal level is regulated by a variable resistor R2. All four channels are identical in circuit and differ only in the values of the capacitors of the frequency-selective circuits (capacitors of small capacity ZC4 and 4C4 may not be required, since the parasitic capacitance of the installation is approximately the same). Variable resistors 1R4-4R4 are designed for the main control of the signal level separately in each channel. This allows you to choose the optimal color saturation in the channels, and also, if necessary, create a constant illumination (background) of the desired color at low signals and in pauses.

Band signal amplifiers are assembled on three transistors. Two of them (in the "red" channel 1V1, 1V2) work in the pre-amplification stages, the third (1V3) - in the output stage. Amplifier loads are HI-H24 incandescent lamps. The use of lamps for different voltages in each channel made it possible to obtain a smooth> change in the brightness of the glow with sharp changes in the signal. The combination of lamps indicated in the diagram provides, at low input signal levels, the reproduction of a color background obtained due to the weak glow of lamps with high inertia (H4-H6, H10-H12, etc.) and at the same time a sharp increase in brightness during strong flashes of the input signal due to the lamps H1-H3, H7-H9 and others, which flash in this case with overheating (due to the short duration of the flashes, this is not dangerous).

The unit is powered from the AC mains through a stabilized rectifier that provides an output voltage of 26 ... 30 V at a load current of 4 ... 5 A.

During installation, the transistors of the terminal and output stages (1V2, 1V3, 2V2, 2V3, etc.) must be installed on heat sinks with an effective cooling surface area of at least 300 cm2.

Establishing the installation comes down to selecting resistors for the bias circuits of the first stages of preamplifiers (1R3, 2R3, etc.) at the start of ignition of the lamps with a minimum signal at the input and to selecting capacitors for frequency-setting circuits so that the bands of adjacent channels overlap somewhat.

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