The output stage of the ultrasonic frequency converter. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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Recently, integrated amplifiers of the K174 series have been widely used as output stages of amateur radio devices. I consider the use of K174UN 14 and K174UN 19 microcircuits (analogues - 2003 and 2030, respectively) to be the most suitable for these purposes.
Usually chips are used in a typical switch, although you can use them to a greater advantage.
The proposed amplifier on the K174UN19 chip was manufactured and tested in the RA3PEM "Rosa" transceiver path, instead of the rare K174UN4 in our time, which is a powerful operational amplifier. An OOS was introduced into the amplifier (chain R4, R6, C2, C5), as a result of which the frequency response of the amplifier has a blockage of 12 dB / octave at frequencies above 2,7 kHz.
Similarly, the OS can be entered into the ULF on K174UN14.
Author: S. Sapotko (EW2AH), Molodechna; Publication: cxem.net
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