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Power Amplifier Speaker Protection Circuit Schematic

electronicecircuits, January 22, 2011August 15, 2023
Power Amplifier Speaker Protection Circuit Diagram

Power Amplifier Speaker Protection Circuit Schematic

While switching a power amplifier on, a loud thump sound is heard to sudden heavy discharge current through the speaker at the time of power on. This current may damage the speaker, especially in case of direct coupled amplifier. so you can protect that from this speaker protection circuit.

Speaker Protection Circuit Schematic

PARTS LIST
R15KΩ Preset
C11000µF 25V
C20.1µF (104)
D1IN4001
Q1BC107
RL19V 500Ω Relay
LS1Speaker

The circuit given here protects speakers from the current surge. When the amplifier is off, relay switch is also off. When the amplifier is switch on, R1 and Ci provide delay of a few seconds to switch the transistor on which energizes the relay.

BC107 GENERAL PURPOSE SMALL SIGNAL NPN BIPOLAR TRANSISTOR PIN CONFIGURATION
BC107 NPN TRANSISTOR

Delay time is proportional to value of R1.

Power Amplifier Speaker Protection circuitSpeaker Protection Circuit Diagram

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Electronic Circuits Power AmplifierProtection Schematics

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Comments (10)

  1. Hotwaterwizard says:
    March 30, 2011 at 9:51 am

    Nice circuit. I would love it if it could use a 12v Cube relay instead of the 9v relay

    Reply
  2. pasanlaksiri says:
    April 24, 2011 at 7:58 am

    Hmm hey, you better at least use 555 timer for this instead of capacitor.

    Reply
  3. sandra akoth says:
    May 16, 2011 at 5:48 pm

    please send me a 50w power amplifier design driven by a pre amplifier

    Reply
  4. Yoram says:
    November 3, 2011 at 1:21 am

    Capacitor use is just fine do not listen to Pasanlaksiris advice!

    Reply
  5. Nkwenti says:
    November 24, 2011 at 11:52 pm

    I use C945 transistor for this schematic and it works well….thanks for the diagram sir

    Reply
  6. GreenDiamond says:
    March 2, 2012 at 5:34 am

    I am an idiot so I would rather not risk my speakers by making one myself so I am wondering where I can buy factory made units on line?!

    Reply
  7. mk says:
    September 12, 2012 at 3:16 am

    ineed more

    Reply
  8. muththu says:
    September 23, 2012 at 1:27 pm

    very nice jobs

    Reply
  9. mostafa says:
    December 4, 2013 at 5:09 am

    plz i want a full picture i want to put all the components above on the board plz

    Reply
  10. Madhavi says:
    July 31, 2015 at 10:06 pm

    This is interesting and useful circuit. Would try to build this by myself. Thanks

    Reply

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