13-09-2013, 02:34 PM
HARTELY OSCILLATOR
Aim:
To design and construct the given oscillator for the given frequency (fO).
Theory:
Hartley oscillator is a type of sine wave generator. The oscillator derives its
initial output from the noise signals present in the circuit. After considerable time, it
gains strength and thereby producing sustained oscillations. Hartley Oscillator have two
major parts namely – amplifier part and feedback part. The amplifier part has a typically
CE amplifier with voltage divider bias. In the feedback path, there is a LCL network.
The feedback network generally provides a fraction of output as feedback.
Procedure:
1. Connections are made as per the circuit diagram.
2. Switch on the power supply and observe the output on the CRO (sine wave).
3. Note down the practical frequency and compare with its theoretical frequency.
Result:
Thus Hartley oscillator is designed and constructed and the output sine wave
frequency is calculated as