Circuit Detail
Regarding the project is ten band graphic equalizer for one channel (mono) audio system. If you would like to Stereo EQ ,You need build 2 similiar circuits for 2 channel (stereo) audio system.
The audio equalizer build based on IC TL074 with low noise JFET op-amp that will give you high quality audio output.
Electronic Part List
10 Channel Graphic Equalizer Circuit by TL074
All Resitors is 1/4W 1%
C1=47uF/25V
C10=27nF 100V
C11=12nF 100V
C12=6.8nF 100V
C13=3.3nF 100V
C14=68nF 100V
C15=33nF 100V
C16=18nF 100V
C17=8.2nF 100V
C18=3.9nF 100V
C19=2.2nF 100V
C2=47pF
C21=560pF
C22=270pF
C23=150pF
C25=150pF
C26=10uF/25V
C3=150pF
C4=1.5uF 100V
C5=820nF 100V
C6=390nF 100V
C8=100nF 100V
C9=47nF 100V
IC1…3=TL074
J1…3=RCA Jack
R18….27=220Kohms
R2-5-31=1Mohms
R3=47Kohms
R4=15Kohms
R6-28=10Kohms
R7….17=1Kohms
RV1=250Kohms Lin.
RV2…..12=4.7Kohms Lin.
S1=2X2 SW
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10 band eq