Kindly explain this circuit

Discussion in 'General Electronics Chat' started by triplehdineshbabu, Feb 20, 2009.

  1. triplehdineshbabu

    Thread Starter Active Member

    Feb 5, 2009
    38
    0
    Hi all,

    Kindly explain the attached circuit diagram.

    Thanks in advance
     
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  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Which one, you included two of them?

    The first is a basic RF oscillator/transmitter. Basic common base configurations, the cap between the collector/emitter is for feedback, and the collector tank circuit selects the frequency.
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Circuit 2 is an alarm. If AC power is present, T3 will be on and energize the relay, opening the alarm contacts. If T2 gets turned on, it will pull T3 out of conduction, and sound the alarm.

    It is not clear to me under what conditions T2 will turn on.
     
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