simple bass booster circuit diagram

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This bass boost diagram is easy to build and work well, I made it because people asked me the schematic diagram of bass boost diagram on my youtube channel.



The circuit has 9 dB gain@40 Hz that mean you will get good bass performance even you play music to a small speaker.
Why this circuit doesn't look like circuits on the internet?

Almost every circuit on the internet uses R/C filter between pre-amp and power amp stage to bypass high frequency to a ground and that seems audio signal being amplified and bypass to ground. I think it wastes pre-amplifier gain, the more gain preamp stage the more distortion to the audio signal, so I use a capacitor to send more negative feedback to pre-amp negative input when the frequency higher than cut-off frequency, capacitor impedance(resistance) higher when frequency lower and that make negative feedback decrease when frequency lower.

An op-amp distortion lowers when negative feedback higher, that mean high-frequency distortion lower when you use this circuit because frequency over cut-off frequency's total harmonic distortion being suppressed around 20 DBs more than normal R/C filter.

The C5 cap can be replaced with MKP type or polystyrene film cap with 1% Precision for the best result.

List of component:
potentiometer = 10 kilo-ohms
IC1 ne5534 (you can use another opamp that pin compatible to the ic)
R1,R6 = 1 kilo-ohms
R2,R3 =10 kilo-ohms
R4,R5 = 4.7 kilo-ohms
C1,C3 = 2.2 uf 16 volts
C2,C4 = 47 uf 16 volts at least (no more than 100 uf)
C5 = 0.1 uf
C5 value can be change depend on your listening behavior
0.1uf = + 15dB(gain = 6 times)@159 Hz and + 17.84dB(gain = 7.8 times)@80 Hz and then + 19.39dB(gain = 9.33 times)@40 Hz good for very small speaker, 2 way car speaker 
0.2 uf = + 15dB(gain = 6 times)@80 Hz  good for small speaker
0.4uf = +15dB(gain = 6 times)@40 Hz   good for someone that love deep bass boost and big speaker

See testing video

Comments

  1. Unknown9/4/17, 1:15 AM

    Sir, Can i use 'HA17741 OP-AMP? & Resistor Wattage? Can i attach this bass booster to the input of 'PAM8610 AMPLIFIER BOARD?

    ReplyDelete
  2. rftechguy2/13/19, 11:10 PM

    New question and thanks for the clarification that the potentiometer is simply in series with the output of your mp3 player/input of your circuit (but please when you have a chance update the schematic to reflect his).

    Anyways,

    I am using an OPA627 OP-AMP with ALL Solen metallized Polypropylene Capacitors (stuff I had laying around and some new one's off of Madisound).

    Can I simply run my OP-AMP with a differential +ve & -ve 15VDC supplies ? Your circuit is running single ended with -Vs tied to ground.

    In theory, this should work without having to change anything else in your schematic.

    Thanks in advance,
    Joe

    ReplyDelete
    Replies
    1. esw2/18/19, 10:14 PM

      I 've answer your question on my Facebook page already.

      Delete
  3. Ishita3/31/21, 1:44 PM

    Sir could pls give block diagram and working for this circuit?

    ReplyDelete

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