Saturday, April 23, 2011
Here is a simple subwoofer filter circuit that can be powered by a 12V DC. This circuit is very useful in automotive applications subwoofer. The circuit is a low pass filter whose pass frequency can be set between 60 to 160 Hz
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| Subwoofer Filter Circuit Using Op-Amp TL072 |
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| Op-Amp TL072 |
The circuit is built around the TL072 dual op amp IC BIFET. Of the two operational amplifiers 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.
Note:
- The circuit can be powered from 12V DC.
- 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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