Hartley Oscillator Circuit Diagram With Values. In the circuit diagram resistors r1 and r2 give a potential divider bias for the transistor q1. Consider the given figure in which hartley oscillator is constructed with operational amplifier and feedback lc network.
The tank circuit has two inductors where the value of one inductor is 39uh. R1 and r2 are biasing resistors and rfc is the radio frequency choke which provides the isolation between ac and dc operation. As we know many electronic circuits and microcontrollers require a source of signal with specific frequency and amplitude which may range from few hz to several ghz.
To provide this type of signal we use circuit called oscillator.
The frequency of hartley oscillator is. Suppose a hartley oscillator with a variable frequency of 60 120 khz consist of a trimmer capacitor 100 pf to 400 pf. The frequency of hartley oscillator is. Fo 1 2π l1 l2 c 1 2π 30 10 6 1 10 8 100 10 12 2 9 10 6 hz 2 9 mhz.
