Car subwoofer filter
Description.
Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automobile subwoofer applications. The circuit is nothing but a low pass filter whose pass frequency can be adjusted between 60 to 160 Hz.
The circuit is designed around the TL072 dual BIFET opamp IC. Out of the two opamps inside the chip, IC1A is wired as a buffer. The left and right audio inputs after mixing is fed to the input of the IC1A using the DPDT switch S1. Switch S1 is the phase control switch which can be used to make the subwoofer in phase with other speakers. When S1 is in position 2, 180 degree phase shift will be induced.POT R7 can be used for controlling the level. IC1B forms the low pass filter whose pass frequency can be controlled by adjusting the dual gang POT R13.
Circuit diagram .
Notes.
- Assemble the circuit on a good quality PCB.
- The circuit can be powered from 12V DC.
- IC1 must be mounted on a holder.
- S1 is a DPDT switch.
- R13 should be a dual gang linear POT.
- C5 and C6 must be polyester capacitors.
- POT R13 can be used for adjusting the pass frequency.
- POT R7 can be used for adjusting the level.
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Hi sir this circute is to be connected before amplifire or direct subwoofer please reply me
can i connect it to any amplifier or there is a specific amplifier???
HI.. this can be done using a simple RC lowpass filter adding input of power amplifier ..
it was a ampli there?
the output of the subwoofer needs to amplifi…..
the circuit given is a filter circuit….
hi, im ashok
1,do we need to amplify the subwoofer output or we can feed it directly to it?
2,if we have to amplify it ,then wats the amplifier circuit?
3,moreover the pin 8 is supply but it is connected to 3rd pin via 100k, is that rite?
4,is the input is preamp input or amplified input?
anybody plz reply,,,,,
my email is ashokpkumar@yahoo.com
pls. Ineed i complete circuit on an automatic voltage stablizer
Hello, greetings from Argentina, I’m interested in making this circuit. I’m not good in the design of PCB’s, will have a chance to send me the pcb for this circuit to my mail?
Thank you!
Hi Pin No 8 of IC TL072 should be connected to +12V. Common zero volt tp pin no 4.
i think this will take power from the audio source itself ,,
I saw the circuit diagram of car sub woofer but I confuse which poit apply 12v DC.