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.

PARTS LIST

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

Capacitors

C₁, C₂, C₃ = 0.01 µF

C₄ = 10 µF/16V    

C₅, C₆ = 10 µF/12V

Semiconductors

IC₁ = µA751

T₁ = BC148

Miscellaneous

SW₁ = ON/Off switch