Variable High Pass Filter Wiring diagram Schematic

This Variable High-Pass Filter Circuit Diagram second order filter which should prove useful in audio applications uses an LM1458 or other similar of op amp. It is tuneable from 30 to 300 Hz cutoff. R2a, b are ganged log-taper potentiometers. 

Variable High-Pass Filter Circuit Diagram

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Tone Control Subwoofer Low Pass Filter IC

• CMOS Technology
• 2 - Channel Input
• 3 - Channel Output (Including 1 stereo Output and Subwoofer Output)
• Low Total Harmonic Distortion (THD<0.01%, Subwoofer THD<0.2%)
• High S/N Ratio (S/N Ratio <-87dB, A-weighting)
• Least External Components
• Adjustment of Frequency response by changing the value of the external component
• Single Power Supply: 3 to 8.5 Volts
• Available in 20 pins, DIP or SO Package
• Multi-Media 3D Satellite Speaker and Subwoofer System
• Car Audio
• Audio Equipment
• Sound Card
• Other Electrical Audio Equipment

Tone Control Subwoofer Low Pass Filter IC

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LH003Wideband two pole high pass filter

The circuit provides a 10MHz cutoff frequency. Resistor R3 ensures that the input capacitance of the amplifier does not interact with the filter response at the frequency of interest.

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