Hartley Oscillator

INSTRUCTION

  • Part 1:Use these values and perform the experiment.
    1. Set R1=100kΩ
    2. Set R2=5kΩ
    3. Set R4=1kΩ
    4. Set Re=10kΩ
    5. Set C1=0.01μF
    6. Set L1=10mH
    7. Set L2=20mH
    8. Set Cin=100nF
    9. Set Cout=0.1μF
    10. Set Ce=100nF
  • Note: The values of Capacitors and Inductors should STRICTLY lie in range Of micro units as shown in Controls Section.

  • Part 2:Solve questions as directed and perform the experiment for given values of Capcitors and Inductors.

CONTROLS

   Collector Resistance(R4) :      Ω
   Emitter Resistance(RE) :      Ω
   Base Resistance(R1) :      Ω
   Base Resistance(R2) :      Ω
   Coupling Capacitor(Cin) :     μF
   Coupling Capacitor(Cout) :     μF
   Bypass Capacitance(Ce) :      μF
   Capacitor(C1) :     μF
   Inductor(L1) :     μh
   Inductor(L2) :     μh

OUTPUT GRAPH

Check Output

EXTRA ACTIVITY

  1. Measure the peak to peak output voltage of the output.
  2. Measure the DC (average) level of the output waveform at the collector of Q1 and on the other (output) side of AC coupling capacitor C4
  3. Measure the period (time T) of the output waveform and its frequency (1/T). Compare this measured frequency to what you calculated by
    4. formula
  4. Fill in the table below with the measured frequency for other C1 values.
    5. C1 Options L1 = 10μH L2 = 100μH L1 = 1μH L2 = 10μH
    Value Frequency Frequency
    1nF
    2.2nF
    4.7nF
    10nF
  5. Steps to design Hartley Oscillator:
    1. Assume value of Capacitor as 100pF
    2. Use the formula of frequency of operation and find the value of L= L1 = L2