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Radio constructor "Fon-9" from 1989 produced the Moscow plant "Elling". The stereo expansion unit is made assembled and is designed to design and upgrade radio equipment. The board assembly and the switch is designed to correct the crosstalk between the channels and improve the perception of the stereo effect in any stereo reproducing equipment due to the apparent change in the base between the loudspeakers. The unit is a functionally complete unit, assembled using analog K174 series ICs, as a module. Technical data: Band of reproducible frequencies 20 ... 20000 Hz. Sensitivity at a rated output voltage of 250 mV at a frequency of 1000 Hz in the "Stereo" mode is not more than 250 mV. Harmonic factor is not more than 0.5%. The power supply is 15 V. Using the set "Von-9" together with the kits "VON-6", Von-7 "," Von-8 "," Von-10 "and" VON-11 "you can assemble high-quality VHF-FM stereo radio.