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Graphic 10 band EQ

2017-12-21 04:49  
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10 Band Graphic Equalizer

EQ_10_Band.gif (39155 bytes)

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 The circuit of graphic equalizer, allocates ten adjusting potesometer , that each one from them affects in a predetermined area of frequencies, the central frequency of which abstains a octave (double), from the central frequencies of her neighbouring regions. Each unit has common materials with remainder and it differs only in the capacity of capacitors that constitutes the filter in each unit. When the runner of fader regulation RV1 until RV10, is in the middle then we do not have no intervention of filter above in the signal that passes from in his and gain of particular unit, is one [ X1 ]. On the contrary if the runner is moved to a side of exit, the unit acts as filter of cutting off of area and it degrades the signals of predetermined area of frequencies. On the contrary if it is moved to the side of entry, the rung acts as filter of passage of area, strengthening the signals of predetermined area of frequencies. The quality of all materials should be very good. Specifically potesometer RV1... the 10 and capacitors. If it is intended for stereo use then it will be supposed it is made in two pieces with as much as possible suited the materials, between the channels, so that do not exist differences in the regulation of each band frequencies. Switch S1 isolates the circuit EQ, when him we did not need and it ensures level [ flat ] response in the exit of circuit. The circuit should be connected between preamplifier and in a final power amplifier.

Part List

R1....20= 10KohmsC4= 10nF polyesterC18= 68pF polysterine
R21....40= 1MohmsC5= 47nF polyesterC19= 360pF polysterine
R41= 10KohmsC6= 4.7nF polyesterC20= 36pF polysterine
R42= 1KohmsC7= 22nF polyesterC21= 4.7uF polyester
R43.....52= 2.2KohmsC8= 2.2nF polyesterC22-23= 33pF polysterine
R53.....62= 47KohmsC9= 12nF polyesterC24= 10uF 25V
R63-64-66-67= 47KohmsC10= 1.2nF polyesterC25-26= 47uF 25V
R65= 10KohmsC11= 5.6nF polyesterC27...32= 47nF polyester
R68-69= 47 ohms 1/2WC12= 560pF polysterineIC1...3=TL074
RV1....10= 100Kohms  lin FADERC13= 2.7nF polyesterS1= 2X4 SW for stereo
RV11= 10Kohms  log.C14= 270pF polysterine
C1= 180nF polyesterC15= 1.5nF polyester
C2= 18nF polyesterC16= 150pF polysterine
C3= 100nF polyesterC17= 680pF polysterine

 

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