This is the simplest DIY low pass filter for subwoofer using uA741 single op-amp ic. The circuit performs really well compared to it's price. The cut off frequency of this circuit is 25Hz to 80Hz maximum.
Using this circuit , you can easily design a 2.1 Subwoofer and Speaker System at your home.
The circuit is commerially available in market, contains very few components. You can easily make one by following the instructions in this tutorial.
Subwoofer low pass filter schematic
The same circuit is working in my own hand made sub-woofer system. So Try this.
Parts List
Below the part list of the diy low pass filter for subwoofer.
- R1,R3,R4 = 10K 1/4W
- R2=100K 1/4W
- CY1,CY2 = 0.22uF Polyester
- C1,C2 = 10uF/25V Electrolytic
- IC1 = uA741A Single Op-Amp Ic + 8 Pin Ic Socket
- 3 Pin Male & Female Connector x 2
- 2 Pin Male & Female Connector x 1
- PCB as in required size 4.5 cm x 3.4 cm
good night
I have seperately subwoofer circuit it require input. i want this circuit board is connect my 2.1 amplifier using la4440 ic .i dont know how to connect woofer circuit in amp.which point is input to woofer circuit in amp.
Bit confused.. Can you suggest me.. Where to connect the smaller one??
Hi Sagar, where you want to connect which part ? Please clarify your question a little.
I want to know where to connect the smaller circuit (Not having 741 IC)?
And Is the smaller circuit need to be connect to power supply separately??
Are the Audio inputs connected to three pin connector?
The smaller section is the power supply, you don't need to connect the power supply separately. And you can make the circuit even on a beadboard.
Thanks
Hi good brother, I think you should first learn how to read schematics because you will face lots of difficulties when you are building your electronics projects. Thank you.
good circuit, the part labled OUT on the circuit thats where i should connect my sub woofer speaker right? then where now do i connect my satelite speakers
sir am hving problem wit this kind o power.is there any to achieved same result and bypass d negative voltage at ur cct. my amp uses battery(12v-18v) the is i bridge d neg to ground so d output is rough .i nid elp. and if there any new cct on subwoofer /bass cct .pls update me .thanks in advance
SIR I WANT HEAVY PUNCHING SUB WOOFER PRE CIRCUITB SIR PLS POST
No. This circuit is made from an OPAMP. A signal from a PHONO, CD, or TAPE is too low in voltage (and signal strength), and cannot drive a WOOFER speaker. What you have to do is apply the PHONO, AUDIO CD, or TAPE as an input to this OP AMP circuit. Then, this opamp circuit can be connected to a PREAMP, and the PREAMP connects to a power AUDIO AMPLIFIER, and the AMPLIFIER drives the WOOFER or the SUBWOOFER. This circuit is just a filter. The opamp and components remove the high frequency parts of the audio signal, and leave only the boomy bass part. That bass part goes to the PREAMP, and to the AMPLIFIER to drive the WOOFER speaker.
REMEMBER, the opamp is a very low output swing, low output current device.