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3 band graphic equalizer circuit diagram Introduction

2017-08-03 13:15  
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This article describes a 3-band graphic equalizer circuit. Schematics can combine text look better grasp of this principle. This circuit uses a single op amp that tends to equalizer provides a three ranges, low, medium, and high. With component values ??shown there are about -20 dB / - to increase or decrease the frequency of 50 hz, 1 khz and 10 khz. Supply voltage may be anything from 6-30 volts. Maximum lift 20 db only the realization of the maximum value of the supply voltage. LF351 is a key component of the circuit. The  LF351  is a low cost high speed JFET input operational amplifier with an internally trimmed input offset voltage (BI-FET IITM technology). The device requires a low supply current and yet maintains a large gain bandwidth product and a fast slew rate. In addition , well matched high voltage JFET input devices provide very low input bias and offset currents. The LF351 is pin compatible with the standard LM741 and uses the same offset voltage adjustment circuit-ry. This feature allows designers to immediately upgrade the overall performance of existing LM741 designs.The LF351 may be used in applications such as high speed integrators, fast D / A converters, sample-and-hold circuits and many other circuits requiring low input offset voltage, low input bias current, high input impedance, high slew rate and wide bandwidth. The device has low noise and offset voltage drift, but for applications where these requirements are critical, the LF356 is recommended. If maximum supply current is important, however, the LF351 is the better choice.



3 band equaliser



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