Power Amplifier Speaker Protection Circuit Schematic

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.

Speaker Protection Circuit Schematic

PARTS LIST
R1 5KΩ Preset
C1 1000µF 25V
C2 0.1µF (104)
D1 IN4001
Q1 BC107
RL1 9V 500Ω Relay
LS1 Speaker

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 circuit Speaker Protection Circuit Diagram


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9 comments on “Power Amplifier Speaker Protection Circuit Schematic
  1. mostafa says:

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

  2. muththu says:

    very nice jobs

  3. GreenDiamond says:

    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?!

  4. Nkwenti says:

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

  5. Yoram says:

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

  6. sandra akoth says:

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

  7. pasanlaksiri says:

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

  8. Hotwaterwizard says:

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

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