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    2SC1970 FM transmitter

     

    2SC1970 FM transmitter

    The FM transmitter idle disassemble parts, FM transmitter can be used for music or voice signals, other than ordinary FM radio 2kM receiving.
        The whole circuit as shown in drawings. External audio signal is amplified by the transistor Tr1 loaded in the diode D1. Tr2 and crystal, reel T1 25MHz high frequency oscillator. The modulation of the audio signal does not use the varactor diode. But alternative use ordinary rectifier diodes V06G. V06G and 25MHz crystal demolition from the old computer. The 25MHz FM signal warp volume T2 coupled to the lower level.
        In order to obtain a 100MHz FM signal output. Tr3, Tr4, reel T3 constitute the octave level. 50MHz signal and warp volume T4 coupled to the lower level.
      T5, T6, the reel L5 again multiplier, the input signal is 100MHz FM signal is coupled to the excitation level and the T6.
        The high-frequency power amplifier using high-frequency amplifier tubes 2SC1970. Its parameters 40v, 0.6A. Power 1.3W, frequency of 175MHz. The level collector current of 0.15A.
        The high frequency output signal can be connected to an antenna, external transmitter. 50 load resistance measured output power of 0.25W. The linear distance 2.5kM stable reception.
    (Editor's note: the use of radio transmitters to comply with the relevant laws and regulations of the State)
    Note: You need two pictures combined is the complete circuit diagram

     
     
     
    2SC1970制作FM发射机电路图2SC1970 FM transmitter
     
    2SC1970制作FM发射机电路图2SC1970 FM transmitter

     

     

     

     

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