sobota, 7. december 2019

FT 920, FT 897D and FT1000MP audio white noise reduction

 




The  FT 920, FT 897D and FT 1000MP has the same audio amplifier TDA2003, where  white noise was rather disturbing. Therefore I added a recommended feedback  according TDA 2003 data sheet description. According to the recommended  formula, the RC circuitry cuts tones higher than 3 kHz. The additional serial RC circuit can be directly soldered between pins 2 and 4 of theTDA2003. See picture 1

For  SSB ( 2,7kHz)     Rx= 39Ohm    Cx= 270nF







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