The NE555 FM modulation circuit

  
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In the figure is the NE555 FM modulation circuit. In the figure, NE555 7-pin is connected with a FM modulation circuit which is composed with R5 and C2, but the frequency range is kind of small. VT1 and VT2 form a current Miller circuit, which generates a charging current in the charging circuit, the current magnitude is decided by R2 and RP1. The low-freque..
The NE555 FM modulation circuit - schematic




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