Low pass filter for subwoofer

Description.
Many low pass filter circuits for subwoofer are given here and this is just another one. The circuit given here is based on the opamp TL062 from ST Micro electronics. TL062 is a dual high input impedance J-FET opamp which has very low power consumption and high slew rate. The opamp has excellent audio characteristics and is very suitable for this circuit.
Out of the two opamps inside TLC062, first one is wired as the mixer cum pre amplifier stage. The left and right channel are connected to the inverting input of IC1a for mixing. The gain of first stage can be adjusted using POT R3.The output of the first stage is connected to the input of second stage through the filter network comprising of components R5,R6,R7,R8,C4 and C5. The second opamp (IC1b) serves as a buffer and the filtered output is available at the pin 7 of the TLC062.

Circuit diagram.

Power supply for the circuit.

Notes.

  • Assemble the circuit on a good quality PCB.
  • The circuit can be powered from a +12/-12 V DC dual power supply.
  • IC1 must be mounted on a holder.

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68 Responses to “Low pass filter for subwoofer”

  • jboy says:

    good day sir! im just wondering if i can supply this circuit with +/-18 volts. hope you can give some advice..

  • kashif khan says:

    sir, can i use ic 4558 to built a low pass filter plz plz.. help

  • Midhunmp says:

    Sir,
    I am new in electronic field. I want to build a subwoofer amp. I made a 150w poweramp for subwoofer using +35/-35v 5amp dual power supplay. Now i have a doubt. If any problem can i connect the filter circut to the 35v 5amp dual power supplay? Please clear my doubt sir. And give me a solution to overcome this limitation. Iam hoping ur replay. Please help me… Have a good day..

  • abubakar says:

    dis works wonderfully great wit my 100watt amp 10x sir 4 dis wonderfull job

  • Birtod says:

    Sir, may I know why the ceramic capacitors in the filter diagram have polarity symbols?

  • abubakar says:

    pls sir can I use electrolytic capacitor for c4 and c5??

  • vicky says:

    hello sir i wan’a surrounding circuit that means left right that to centre(mid range) and surround left right circuit

  • RAVI says:

    GIVE A USB MODEM CIRCUIT 3G/4G, FOR LOW NETWORK AREAS.
    WITH DUAL, QUAD BAND ANTENNAS.

  • cooool says:

    sir I built both 100 watt subwoofer amplifier and subwoofer filter but nothing works. I built subwoofer filter using 47k fixed resistor instead of pot and I connected to a sterio amplifier (I don’t know power of amplifier) but nothing come out please help in building both circuits I spend nearly Rs. 2000/- for this circuit’s component. thankyou.

  • GS TURNA says:

    Hello sir, this circuit oprate on 12-12 G.But i need it work on 12 0. Is this possble, if yes then how please help me

  • shreyas98 says:

    can some one please tell me the function of R6 and R7 and if i could use 2 presets and furthermore can i use a preset for R3 to make rare adjustments?

    • Seetharaman says:

      Hi for R3 you can use a preset as it is meant level, if you are going to use only the same input source always. R6 & R7 should be a ganged pot or you can use 2 identical presets adjust them in similar fasion such that they operate like a ganged control. you can attach both the presets with a thin non conductive shaft.

  • cooool says:

    Sir can I connect this filter output to a 50watt power amplifire or there is any specific amplifire for this circuit please reply me.

  • rujtam says:

    Sir,maybe you have a layout pcb this filter,please send to my mail,,actualy I confuse conect pins pot line..
    Thanks very much….

  • rujtam says:

    Sir,,I tes this filter,I connect out to subwoofer,but I can hear a sound,what the problem,or I must conect that to power amplifier..
    Thanks sir,,I am newbie…:)

    • Seetharaman says:

      you have to connect the output of this filter to a subwoofer power amplifier of not less than 40watts RMS

  • rujtam says:

    Hi sir,,can I change R3 with 50k and R6/7 with 20k??coz difficult look for that pot..

  • jay olvido says:

    sir im an enthusiast bout electronics .favor please sir please do mail me tthe more detail schematic of this low pass filter sir? with the values of each capacitors and resistors used? it means a lot to me sir if you grant my asked favor.thank you in advance

  • Pankaj says:

    Hello Sir,
    I am planning to build this circuit but I am not able to find this tl062 ic. so can I use tl074 instead of tl062.

    • Seetharaman says:

      YTou can use TL072 or TL082 they are dual Fet opamps. TL074 is quad you can use them also. Two of the quad can be used

  • Zygis says:

    Hi, i made this filter and it works perfect! I’m really happy with that. But i had to change R1 and R2 in to lower nominal couse it plays very quietly. I change to 4.7kOhm and than everything worked fine. Thank you! :)

    P.S I was using my cell phone to test this filter.

  • jenken says:

    thank u sir? i’ve done it the sound very low? ur the best?more power to u! im using ic op amp.4558?

  • jenken says:

    Thankl u very much! i realy like this circuit the sound very deep? very low? thank u sir?

  • alastair says:

    whats that largest subwoofer that could be powerd by this circuit 100W 200W 500W?????

  • siva kumar says:

    sir, i want a great circuit for an 100 watts subwoofer amplifier. so please help me!

  • Pankaj says:

    sir also how can I fabricate it on a copper clad board?????
    I mean from where I can get its board layout

  • Pankaj says:

    Sir Iam not able to understand the working of the circuit
    please explain how this circuit work..

    • Seetharaman says:

      Hi Pankaj IC1a is used as a gain controlled buffer amplifier. IC1b is used as an active tunable low pass filter in the very low audio frequency area(with R6 & R7 filter charesterestic can changed a little.
      You can use an universal board (staight line vero boards or connecting perforated dotted boards suitably)

  • kanagaraj.s BE says:

    i want dts 5.1 AV For home theatre demonstration my mail id
    kaudios.s@gmail.com

  • kanagaraj.s BE says:

    sir i want dts 5.1 music for home theater demonstration where it available

  • SUNRISEZERO says:

    Dear sir,
    I would like to ask you if this filter can be used to infrasound frequencies … 1 to 12 Hz
    thank you

  • wally francia says:

    two input signal left and right will be feed to this amp. and the output will become one??

  • walter says:

    sir is my understanding is correct that i will feed left and right signal in the input of the circuit, and later it will become one output…

  • walter says:

    what is the wattage of resistor?

  • walter says:

    do you have simple transistorized low pass filter? kindly send me if you have one because IC is kinda expensive thanks…

  • walter francia says:

    what is the wattage of resistor and voltage rating of capacitor?

  • Seetharaman says:

    Hi Alam through an 100K volume control you can feed the output of this filter to any high power amplifier.
    Hi Abhinash you have to connect the output through high power amplifier to the speaker (sub woofer)

  • alam says:

    how to use this circuit with 150 watt amplifier ???
    1) by connecting its output to the inputs of amplifier
    or if it should be connected by other method so please define it …

  • krishna says:

    it is really working and bass is too good.
    thanks!!!

  • Abinash says:

    Sir, shall i connect the output of above circuit directly to speaker or i have to connect a TDA7240A amplifier to it???
    Thanx in advance???

  • arunkumar says:

    i assembled 100 Watt sub woofer amplifier. but it somke
    please do needful

    used spare
    ==========

    24-0-24 transformer 5 ams

    thank you

    k.arunkumar

  • arunkumar says:

    i assembled 100 Watt sub woofer amplifier. but it somke
    please do needful

    used spare
    ==========

    24-0-24 fransformer 5 ams

    thank you

    k.arunkumar

  • vivek says:

    thanks seetharamam the circuit works great but im not able to get which potentiometer to use for what

  • prasad says:

    common man, need help !!! I saw this Circuit on the web which i
    was searching for kind of one
    for a long time and unfortunetly there
    are some mismatch between PCB,
    Data Sheet, Built PHOTO posted. i really
    need this circuit so, looking for help from you to understand the
    Circuit and need its working
    DIagram http://www.free-circuit.com/
    subwoofer-filter-gainer-auto-power-
    system-circuit/

  • prasad says:

    and also IC pins not numbered Mr.seetharaman my mail is Sevinfurly@gmail.com please post corrected Datasheet to my mail

  • prasad says:

    I saw this Circuit on the web which i was searching for kind of one
    for a long time and unfortunetly there are some mismatch between PCB,
    Data Sheet, Built PHOTO posted. i really need this circuit so, looking
    for help from you to understand the Circuit and need its working
    DIagram

    http://www.free-circuit.com/subwoofer-filter-gainer-auto-power-system-circuit/

  • peter says:

    can IcTLO62 be substituted with ICJRC4588

  • Seetharaman says:

    Hi Vivek it will work. the transformer should be rated for at least 12volts at 3amps

  • vivek says:

    Thanks Seetharaman, for that website. I am working on this circuit and planning to connect it to a TDA 2030 audio amplifier im having will it work or do i need any other amplifier? Thanks in advance.

  • Seetharaman says:

    Hi Vivek if you have 9volt transformer and require plus12v minus12v un regulated power supply use the following circuit
    http://www.play-hookey.com/ac_theory/ps_v_multipliers.html

  • vivek says:

    thanks seetharaman for the reply and can you help me in getting dual power supply from single output transformer.
    thanks in advance

  • seetharaman says:

    Hi Vivek you can limit the upper frequency response from 30Hz to 150 Hz by the turn of the ganged potentiometer (stereo potentiometer).

  • vivek says:

    hi, can the frequency drop down 60hz?

  • seetharaman says:

    Hi Mujtaba these ICs are with bipolar inputs hence input impedance will be low and may load the filter circuit. It is recommended to use FET input operation amplifiers for these filter circuits.

  • Mujtaba ali says:

    hi,
    can i used 4558 or LM358 op amp replace TL062 op amp?
    Thanks

  • Seetharaman says:

    Hi Mike NE5532 can be used as it works down to 6 volts(+3 & -3 volts).
    Hi Romesh it is between 60 and 160 Hz as per pot setting.

  • Romesh says:

    Hi, nice post. By the way what’s the cut off frequency? Or can we change it using the 22k pot. Thanks in advance.

  • MIKE says:

    Hi seetharaman…..can i use NE5532 op-amp instead of TLC06?????

  • RUPJYOTI says:

    Thank u Seetharaman sir.

  • Seetharaman says:

    Hi Rupjyoti you can use TL072 or TL082
    TL062 confirms to Military specification can work down to 4volt ( +2 & -2)
    TL072 confirms to Industrial specification can work down to 7volt ( +3.5 & -3.5)
    TL082 confirms to General Purpose use can work down to 12volt ( +6 & -6)hence for our use this is quite satisfactory

  • rupjyoti says:

    sir,
    Can I use tl072 in place tl062.