How this works?

Discussion in 'General Electronics Chat' started by mhtplsh, Apr 14, 2009.

  1. mhtplsh

    Thread Starter Member

    Jul 29, 2007
    27
    0
    i was just trying to learn about protection circuits in amplifier.
    I want to know how this thermal circuit works?
    The thermal sensor is LM35.
    Thanks in advance,
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Without the external circuit it's hard to be sure. It appears that if either Q3 or Q4 gets turned on the extra current will shut down the 27 volt circuit.
     
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