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| Fig. 1 - PCB 3-Band Active Equalizer Circuit with LF353 IC |
The LF353 is a two-input JFET operational amplifier with an internally compensated input offset voltage. The JFET input device provides wide bandwidth, low input bias currents and offset currents.
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Features
- Internally Trimmed Offset Voltage: 10 mV
- Low Input Bias Current: 50pA
- Low Input Noise Voltage: 25 nV/√Hz
- Low Input Noise Current: 0.01 pA/√Hz
- Wide gain bandwidth: 4 MHz
- High slew rate: 13V / μs
- Low Supply Current: 3.6 mA
- High Input Impedance: 1012Ω
- Low Total Harmonic Distortion : ≤0.02%
- Low 1/f Noise Corner: 50 Hz
- Fast Settling Time to 0.01%: 2 μs
The equalizer circuit.
The 3-band Equalizer use a Integrated Circuits operational amplifier LF353, and the capacitors determine the frequencies, the higher their capacitance, the lower the cutoff frequencies.
The proposed equalizer is a 2-octave graphic equalizer with a 3-band circuit, the cut-off frequencies are at: 150Hz, 1kHz and 12kHz.
This circuit was assembled with LF353, but nothing prevents you from using other replacement pin compatible ICs, such as: LM1558, RC4558, LM358 etc.
The recommended supply voltage is between ±11V and ±15V, but note that the maximum voltage IC supports is ±18V. The IC consumption current is 6.5mA maximum, and 3.6mA average.
The IC has two internal amplifiers, we get a amplifier for each frequency and the last one for the final amplification of the entire circuit. In Figure 2 below, the pinout and configuration of the LF353 integrated circuit is shown.
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| Fig. 2 - Pinout IC LF353 |
In Figure 3 below, we show the complete 3-band equalizer circuit, and that you can download the files in option; Download files below at the bottom of the page.
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| Fig. 3 - Schematic Diagram 3-band Active Equalizer Circuit with LF353 IC |
Components List
- U1 .............. Integrated circuit LF353
- R1, R2, R5, R6 ... 10K resistor (brown, black, orange, gold)
- R3, R7 ................ 3.6K resistor (orange, green, red, gold)
- R4, R8 ................ 1.8K resistor (brown, gray, red, gold)
- C1 ...................... 4.7uF electrolytic capacitor
- C2 ...................... 1uF electrolytic capacitor
- C3 ...................... 50nF polyester capacitor
- C4, C6 ............... 5nF polyester capacitor
- C5 ...................... 22nF polyester capacitor
- VR1 .................... 47K Potentiometer
- VR2, VR3 .......... 100K Potentiometer
- VR4 .................... 500K Potentiometer
- P1 ....................... Screw Terminal Type 5mm 3-Pin Connector
- P2, P3 .................. Screw Terminal Type 5mm 2-Pin Connector
- Others .................. PCB, tin, wires, etc.
Download
We provide the files with the PCB, the schematic, the PDF, GERBER and JPG, PNG and provide a direct link for free download and a direct link, "MEGA".
Click on the direct link to download the files: Layout PCB, PDF, GERBER, JPG
If you have any questions, suggestions or corrections, please leave them in the comments and we will answer them soon.
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