5-Band Graphic Equalizer LA3600

Thursday, January 27th, 2011 - Audio Processor

IC LA3600 is a single chip “Audio Graphic Equalizer 5 channel” that is designed specifically for the equalizer five channels. Audio Graphic Equalizer circuit with IC LA3600 above can control the audio frequencies from 108 Hz to 10.8 KHz. Audio frequency which is controlled by this equalizer was 108 HZ, 343 Hz, 1.08 KHz, 3.43 KHz and 10.8 KHz. The frequency of that frequency is set based on the value of 2 pieces of capacitors in each chanelnya. So for instance want to change the center frequency of each channel value of 2 pieces of the capacitor can be changed as desired.

Features Of 5-Band Graphic Equalizer LA3600

  • On-chip one operational amplifier.
  • 5-band graphic equalizer for one channel can be formed easily by externally connecting capacitors and variable resistors which fix fo (resonance frequency).
  • Series connection of two LA3600’s makes multiband (6 to 10 bands) available.
  • Highly stable to capacitive load.

Circuit Diagram Of 5-Band Graphic Equalizer LA3600

Circuit Diagram LA3600,5-Band Graphic Equalizer LA3600

Fo (resonance frequency) Of 5-Band Graphic Equalizer LA3600

In the sample application circuit, fo for each of 5 bands is set as follows :
fo=108Hz, 343kHz, 1.08kHz, 3.43kHz, 10.8kHz

Formula LA3600,Fo LA3600

Description of external parts 5-Band Graphic Equalizer LA3600

C1, C2 : Capacitors used to fix fo (resonance frequency)
C2 : Input capacitor. Decreasing the capacitor value lowers the frequency response at low frequencies.
C3 : Input capacitor. Decreasing the capacitor value lowers the frequency response at low frequencies.
C4 : Decoupling capacitor. Decreasing the capacitor value makes the effect of power supply stronger, whereby ripple is liable to occur.
C5 : Power capacitor.
C6 : Output capacitor. Decreasing the capacitor value lowers the frequency response at low frequencies.

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