speaker protection circuit help?

Discussion in 'The Projects Forum' started by mhtplsh, Aug 4, 2007.

  1. mhtplsh

    Thread Starter Member

    Jul 29, 2007
    27
    0
    i hv got this speaker protection circuit without full component details.
    Only details with me r
    IC = CD 4049
    C1 = .22k/250v

    R1 = 100K ( I think)
    R2 = 2.2 OHM ( I think)
    R3 = 1M ( I think)
    C4 = .47ufd ( I think)
    C3 = 470ufd/16 ( I think)
    R4 = 5.1k ( I think)

    Modifications :

    Further i want to use speaker rectified power for supply of CD 4049 with one
    9V regulator. My speaker is big one. Hence output AC is also high. I will supply the powersupply before regulator to relay. I want to use 12V DC relay.

    Suggestion & Guidance from fellow members is expected.
    Thanks in advance,
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Your CMOS IC will work with up to 18 volts for Vcc, so the rugulator won't be necessary.

    If I were going to use a protection circuit, I would want to apply the rectified DC to a comparitor, and let that trigger to open the relay.

    Your schematic is cut off so the stuff from the left of the bridge is cut off. That makes it a bit of guesswork to say how the circuit might be modified for a larger amp.
     
  3. mhtplsh

    Thread Starter Member

    Jul 29, 2007
    27
    0
    Thanks beenthere,
    I appreciate ur valuable advice. But can u guide me to some better circuit?

    In the said circuit we connect a resistor in the signal path when the relay cutoff the speaker signal.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
  5. mrmeval

    Distinguished Member

    Jun 30, 2006
    833
    2
    Look at some of the stuff for the high wattage car audio industry. I recall a self resetting fuse that worked well but you did have to know some information on the amp and speakers and it would not prevent some forms of damage just over current/wattage limits.

    Most good amps will test the outputs constantly looking for faults.

    Schematic and explainations
    http://users.otenet.gr/~athsam/protection_2_EN.htm
    http://sound.westhost.com/project33.htm

    Oh wowz kitz!
    http://store.qkits.com/moreinfo.cfm/FK650

    From the almighty to them to you with perfect fidelity...
    http://www.churchsoundcheck.com/faq4.html

    That auto thingy
    http://www.proaudioreview.com/october00/Dynastar-Web.shtml

    And there's more!

    ...
     
  6. mhtplsh

    Thread Starter Member

    Jul 29, 2007
    27
    0
    Thanks mrmeval!

    Can somebody give suggestions for the component values of the circuit attached?
     
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