Help understand basic hartley oscillator

Discussion in 'General Electronics Chat' started by Santa klaus, May 5, 2016.

  1. Santa klaus

    Thread Starter New Member

    Nov 16, 2014
    28
    0
    How come this transistor conducts when the input doesn't reach 0.6 V and the emitter is at the ground?
    The green signal is the collector ouput . the blue is the input.
    upload_2016-5-5_18-51-21.png
     
  2. DGElder

    Member

    Apr 3, 2016
    345
    85
    It isn't
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,056
    What makes you think the transistor is conducting? The voltage after R1 depends on the current flowing into the oscillator, not the transistor.

    Take a look at the current across the transistor.
     
    BR-549 likes this.
  4. BR-549

    Well-Known Member

    Sep 22, 2013
    2,004
    394
    I can't read your circuit......too small and I can not expand it.

    Now.......does the collector signal come from the transistor junction...............or from the bias resistor?
     
  5. BR-549

    Well-Known Member

    Sep 22, 2013
    2,004
    394
    Boy....they sure have slowed down on letting you know someone has posted............while you are posting.

    8 minutes passed, without informing me.
     
  6. Santa klaus

    Thread Starter New Member

    Nov 16, 2014
    28
    0
    Thanks for your replies , .you're right, i checked the transistor isn't conducting.
     
  7. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,056
    I've been embarrassed by this a couple times lately. Not enough to suspect something has changed.
     
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