Low Pass Filter Circuit using Op-amp
Low Pass Filter Circuit using Op-amp TL062 for Subwoofer Pre Amp: The circuit given here is based on the opamp TL062 from ST Microelectronics. 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.
Low Pass Filter Circuit using Op-amp TL062 for Subwoofer Pre-amp
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 the first stage can be adjusted using POT R3. The output of the first stage is connected to the input of the 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.
Low Pass Filter Applications:
- LPFs is also used in audio amplifiers to limit the maximum input frequency it’s usually to 20 kHz.
- LPF’s are Hmany audio amps use different max high and min low freq values in their filters, 20 Hz to 20 kHz is the range of audio frequencies that most humans can hear.
- Low Pass Filters (LPF) is to reduce high-freq noise on signals and make them clearer and this is probably it’s most common use, but there are other uses.
Tags: Audio Amplifiers, Low Pass Filter Circuits, Subwoofer Circuits