5-Band Graphic Equalizer Circuit using LF353 IC + PCB

Fig. 1 - 5-Band Equalizer Circuit with LF353 IC

This 5 Band graphic equalizer circuit is based on the eight pins operational amplifier LF353 integrated circuit.

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 compensated voltage: 10mV
• Low input bias current: 50pA
• Wide gain bandwidth: 4 MHz
• High slew rate: 13V / μs
• High input impedance: 1012Ω
  
  

The equalizer circuits

The proposed equalizer is a 2-octave graphic equalizer with a 5-band circuit, the cut-off frequencies are at: 50Hz, 200Hz, 800Hz, 3.2kHz and 12kHz.

This circuit was assembled with LF353, but nothing prevents you from using other replacement ICs, such as: LM1458, RC4558, etc.

The Power Supply

The power supply used for this circuit is symmetric, i.e.: +15V | 0V | -15V, with a direct current voltage DC.

The recommended supply voltage ranges between ±11V and ±15V, but note that the maximum voltage supported by the IC is ±18V.

The consumption current of the IC is 6.5mA maximum and 3.6mA on average.

The Circuit

The 5-band Equalizer uses three Integrated Circuits operational amplifier LF353, and the capacitors determine the frequencies, the higher their capacitance, the lower the cutoff frequencies.

Each IC has two internal amplifiers, we get an 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.

Fig. 2 - Pinout IC LF353

In Figure 3 below, we show the complete 5-band equalizer circuit, and that you can download the files in option; Download files below at the bottom of the page.

Fig. 3 - Schematic Diagram 5-band Equalizer Circuit with LF353 IC

Components List

• U1, U2, U3 .... LF353 Integrated circuit
  
  
• R1  ................. 47K resistor (yellow, purple, orange, gold)
• R2 to R11 ...... 10K resistor (brown, black, orange, gold)
• R12 ................ 100K resistor (brown,  black, yellow, gold)
  
  
• C1 ................... 680nF polyester capacitor
• C2, C3 ............ 150nF polyester capacitor 
• C4 ................... 33nF polyester capacitor
• C5 ................... 39nF polyester capacitor
• C6, C7 ............ 8.2nF polyester capacitor
• C8, C9 ............ 2.2nF polyester capacitor
• C10 ................. 470pF polyester capacitor
• C11 ................. 4.7uF electrolytic capacitor
  
  
• VR1 to VR5 ... 47K 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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