This circuit is a 5 band graphic equalizer for use in hi-fi audio systems. specially portable systems. you can make your own frequency band by changing C1 and C2 capacitor values in each band. use equetion given below to disign your own band.
Note : Use R1 and R2 as Ohms (Ω) and C1 and C2 as farads (F), then fo will be hertz (Hz).
Don't worry about R1 and R2 those are in-built resistors in the IC. You can make your own resonance frequecy by setting C1 and C2.
In the following circuit, fo for each of 5 bands is set as follows :
fo=108Hz, 343kHz, 1.08kHz, 3.43kHz, 10.8kHz
Applications :
* Portable component stereos
* tape-recorders
* radio-cassette recorders
* car stereos
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