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Subwoofer filter using one transistor

Subwoofer filter using one transistor is very very simple for filtering your subwoofer tone control. This circuit diagram for subwoofer filer using one of transistor :
Subwoofer filter using one transistor circuit diagram
Subwoofer filter is using for filtering audio tone signal, subwoofer tone about 40Hz - 100Hz. Input audio is stereo , and output to mono subwoofer output. It' very simple subwoofer filter, you just need a few component resistor and capasitor, and basically strenghening by 1 transistor , the transistor just using C945 ot C828

Component list Subwoofer filter using one transistor :
  • Q1   C945 / C828
  • C1   1 Uf
  • C2   100nf /ceramix104
  • C3   1uf
  • C4   1uf
  • C5   1uf
  • C6   1uf
  • C7   100uf
  • R1   10k
  • R2   47ohm
  • R3   220k/470k
  • R4   10k
  • R5   10k
  • R6   10k
  • R7   1k
  • R8   2k2

4 comments for "Subwoofer filter using one transistor "

  1. Hi Wahyu,
    Thank you for these simple circuits. I am a hobbyist but not good in electronics. I am making a portable 2.1 speaker (using PAM8403 like class d setup) and need subwoofer filter circuit which can be run using li-ion battery 3.7v (ex: battery 18650). I will be using single supply ICs like lm358 or LM324. however i am unable to find any suitable circuits and whichever i tried created lots of distortion. could you please suggest some battery operated single supply 20 to 150 HZ filter circuit. If the circuit is 2.1 channel then that is also good. I was even going through you other circuit from the article below. can i use the single supply ICs like lm358 or lm324 for the same circuits below with a li ion battery?

    from article above mono premamp>300HZ LPF>PAM8403 thats all. Please suggest best lowpass (20- 150 HZ?)circuit which can implement for my portable speaker project. Thank you once again.

  2. This comment has been removed by the author.

  3. Many enthusiasts install the large subwoofers in the trunk but if you need that space to hold other belongings, you may want to reconsider. If what you're looking for is a deep bass and something that doesn't have a big ban, then you should just go with a normal subwoofer. For most people a smaller subwoofer will be sufficient for their needs. If you tend to play your music at low to medium volume levels, a small subwoofer will bring out the bass enough to enhance the quality of the music. You'll still get a deep and rich bass but of course you won't get a thundering base like the bigger speakers. Then there are the power requirements of the speaker The power requirement of the car subwoofer speaker has to match the amplifier. Obviously bigger subwoofer speakers will need more power or the amplifier simply won't be able to handle it. In some cases, the sound quality will be muffled or will start to distort if the amplifier cannot handle the power of the subwoofer speaker. Another thing to look at is to consider the different designs. Some speakers radiates sound from the side, front, or downwards. This creates a different listening experience. For example, the subwoofer that radiates the sound downwards will keep more of the bass inside your car and create a vibration in your car. car subwoofer

  4. Pls,done tha circuit for 1 transistor surround sir