FM by a timer ME555 circuit


Posted on Mar 28, 2007

The figure is composed by a NE555 and other withered frequency circuit by changing the self-excited multivibrator NE555 charging current to frequency modulation. The circuit is VT1 and VT2 constitute a current mirror circuit, the charging


FM by a timer ME555 circuit
Click here to download the full size of the above Circuit.

current can be generated in the charging circuit, the current size is determined by R1 and RRP1. Low frequency modulation signal superimposed to the bias current IB after the oscillation frequency changes. Try to use the current Miller circuit on the tube.




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