Radioconstructor `` Elektronika E-20 '' (graphic equalizer)
Service devices.The radio designer "Elektronika E-20" (graphic equalizer) has been produced since the 1st quarter of 1990. A high-quality equalizer (eight-band tone control) "Elektronika E-20" can be assembled from the "Start" radio designer kit for adjusting the amplifier frequency response using two stereo channels. The equalizer splits the entire frequency spectrum of the audio signal into eight bands, each of which is fixed at one of the frequencies: 31.5 Hz; 75 Hz; 160 Hz; 400 Hz; 1 kHz; 2.5 kHz; 6.3 kHz; 16 kHz. The location of the sliders on the front panel of the equalizer shows the approximate frequency response correction provided by the equalizer and is therefore called "graphic". With its help, you can improve the quality of reproduction of stereo and mono phonograms, compensating for frequency response distortions arising in the amplifying equipment, as well as in the listening room. Equalizer allows you to get the desired color of the sound. With its help, you can highlight the sound of various musical instruments, eliminate defects arising from the aging of the tape and poor-quality recordings. The equalizer can be used when listening to music programs and when recording them. It will help you create a lot of effects (for example, by raising the 2.5 kHz knobs up, you select frequencies from the spectrum of a musical program that correspond to the soloist's voice), weaken or emphasize the sound of various instruments. The model has an infra-low pass filter with a cutoff frequency of 30 Hz to eliminate electromechanical feedback when listening to a turntable. It is formed as follows: electrical vibrations at the output of the amplifier are converted into the AC into mechanical sound, which are transmitted through the air to the musical plate and the pickup head, where they are converted into electrical vibrations, which are then fed to the input of the amplifier. The price of the radio designer is 22 rubles.
