TV - color and music installation. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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This set-top box gives the properties of a color-musical installation to an ordinary TV set, changing the colors of the image according to the sound acoustic signal. When using it, the television image changes color when the audience talks.
Another use of the prefix is the color accompaniment of musical television programs in order to increase their entertainment. The color of the television image will then change depending on the frequency and amplitude of the musical signal. So, instead of blue and red, green appears, and green changes to blue. Instead of a crimson hue, purple or brown appears. White parts of the TV picture become pinkish. There are many different color combinations.
The attachment diagram is shown in Figure 1.
Rice. 1. Schematic diagram of a color prefix to a TV
The sound acoustic signal is perceived by an active microphone of the "Shoroh-1" type, the signal from which is fed through resistors R1, R6 and R11 to filters of higher, medium and lower frequencies of the audio range, assembled on transistors VT1, VT3 and VT5, as well as on capacitors C2, C4 and C6, dividing the audio signal into high, medium and low frequencies. The high-frequency signal from the collector of the transistor VT1 enters through the detector on the diode VD1 and the capacitor C3, on which a constant voltage is allocated, which is proportional in magnitude to the level of the high-frequency components. This voltage opens the transistor VT2, the collector of which is connected through the resistor R5 to the green channel of the TV, which weakens. As a result, the green areas of the image become blue.
The mid-frequency signal from the collector of the transistor VT3 passes through a detector made on the diode VD2 and capacitor C5. The voltage after charging the capacitor C5 through the resistor R9 opens the transistor VT4, the collector of which is connected through the resistor R10 to the red channel of the TV, thereby weakening it in the image and causing other shades and colors to appear.
The low-frequency signal is taken from the collector of the VT5 transistor and enters through the detector on the VD3 diode and capacitor C7 in the form of a constant voltage proportional to the level of the low-frequency component, which open the VT14 transistor through the resistor R6, the collector of which is connected to the blue channel of the TV, weakening the blue color by image and enhancing the green.
Rice. 2. Topology of the printed circuit board of the color prefix (dimensions 55x55 mm)
The prefix is designed to work with kinescope TVs. The connection is made to the primary color channels on the kinescope board. The common wire is connected to the common wire of the TV.
For color accompaniment of TV programs, the device must be installed near the television receiver, pointing the microphone at the TV speaker, set the variable resistors R1, R6 and R11 to the middle position. If there is a music program, the remote control increases the sound volume of the TV until a change in the color of the television image appears for each of the color channels, adjusting the regulators of the resistors R1, R6 and R11 accordingly.
At the end of the music program, the remote control should reduce the sound of the TV until the color change on the screen disappears. Thus, by adjusting the sound level of the TV with the remote control, you can control the color set itself.
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