Bass Booster

Here is a circuit of bass booster, boosts the beat frequency without effect the high frequency of the music. Bass booster is useful for those who want to hear music with some deep bass.

Circuit description of bass booster

This entire circuit bass booster is build and fabricated around a npn transistor and operational amplifier. Bass booster is divided into two major sections: One section is to bypass higher frequencies and another section is booster section.

The input signal from preamplifier circuit is given to input point of bass booster where higher frequencies will pass through capacitor C1 and lower frequencies through R1. IC1 is used to boost the lower frequencies. Variable resistor VR2 is used to control the boosting level. Switch SW1 is given here is used to remove boosting effect. Output from bass booster is fed to power amplifier section.

Any overloading at output can be controlled by adjusting variable resistor VR1.

NOTE: Grounding should be done perfectly to avoid any distortion.


Resistors (all ¼-watt, ± 5% Carbon)

R1 = 150 KΩ

R2 = 680 Ω

R3 = 100 KΩ

R4 = 220 KΩ

R5 = 10 Ω

R6 = 2.2 KΩ

VR1 = 1KΩ

VR2 = 10 KΩ


C1, C2, C3 = 0.01 µF

C4 = 10 µF/16V

C5, C6 = 10 µF/12V


IC1 = µA751

T1 = BC148


SW1 = ON/Off switch



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9 thoughts on “Bass Booster”

  1. pls can i use BC547 or 548 to replace BC148? and can i use µA741 as d operational amp?tnx.u can reply me in my email or here tnx.

  2. Hey guys, I am only a beginner, where would I find these: IC1 = µA751, T1 = BC148 ? Should I look for ‘µA751’ and ‘BC148’ or how to find them ??

  3. Hi. I have an Dewalt DC011 radio, that have absolutly no bass output in the speakers, and no EQ or Tone adjustment. First I bought new speakers for it, thinking it was the Stock-paper speakers that gave no bass, but no.
    Do you think this would work in my radio to add some bass to the sound, and if it would work, where should I “plug” this in, just on the speaker cables, and from this diagram and to the speakers afterward?

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