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The FM circuit composed of the NE555

2015-01-01 04:44  
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The FM circuit composed of the NE555
The FM circuit composed of the NE555 is as shown in the figure. By changing the charging current of the NE555 self-excited multivibrator, we can do the frequency modulation. This circuit is the current mueller circuit that is composed of VT1 and VT2, and it can produce the charging current in the charging circuit, the current is decided by R1 and RP1. The low frequency modulation signal and the offset current IB are overlied to make the oscillation frequency change. The current mueller circuit need to use the geminate transistor.