Hartleys oscillator using bjt

Discussion in 'Homework Help' started by vishal60, Dec 11, 2009.

  1. vishal60

    Thread Starter New Member

    Nov 30, 2009
    3
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    what is RFC(radio frequency choke) and y is it used in Hartleys Oscillator circuits(BJT) instead of a collector resistance??

    Thanks in advance:):)
     
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    A choke is an inductance. An inductance has a high reactance (impedance) at high frequencies. It passes DC current very well but is a high impedance at high frequencies.
     
  3. S_lannan

    Active Member

    Jun 20, 2007
    247
    2
    Makes the circuit more efficient. The resistor is a dissipative load at all frequencies concerned.

    The inductor is a reactive load and doesn't dissipate power
     
  4. vishal60

    Thread Starter New Member

    Nov 30, 2009
    3
    0
    thnx guyzz...
     
  5. KL7AJ

    AAC Fanatic!

    Nov 4, 2008
    2,040
    287

    You can also resonate the collector inductance with a suitable capacitance and get a cleaner signal.
     
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