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 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.
Fig. 2 - Pinout IC LF353 |
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
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