Hobby Elektronik

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10 Band Graphic Equalizer

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With graphic equalizer we make selective cutting off or boost, of selected departments of acoustic spectrum. With this way we can adapt the musical reproduction, in the characteristics of space where we hear. This can create however also problems if go to far specifically in the gain of some area, with result the distortion. The circuit should be made in two pieces, one for each channel, the potesometer regulation it should they are Fader. With switch S1 we can by pass the circuit, leaving the musical program, to pass without alteration (FLAT). With the potesometer RV1 we regulate the gain of each channel.

ΤΕΧΝΙΚΑ ΧΑΡΑΚΤΗΡΙΣΤΙΚΑ ΠΡΟΤΥΠΟΥ - PROTYPE SPECIFICATIONS

Απόκριση συχνότητας - Frequency Response	10ΗΖ - 30 ΚΗΖ ±0.5db
Ρύθμιση κέρδους κάθε περιοχής - Adjust Gain for eatch band	±12 dB
Ρύθμιση κέρδους - Adjust Gain for eatch Channel	- 9db to +14db
S/N	82db
Παραμόρφωση (FLAT) - T.H.D	0.03%
Σύνθετη αντίσταση εισόδου - Input Impedance	47ΚΩ
Σύνθετη αντίσταση εξόδου - Output Impedance	100Ω
Τροφοδοσία - Power Supply	±15V dc / 300 mA

Part List

R1-29=100 ohms

C7=220nF 100V

C20=1nF 100V

R2-5-31=1Mohms

C8=100nF 100V

C21=560pF

R3=47Kohms

C9=47nF 100V

C22=270pF

R4=15Kohms

C10=27nF 100V

C23=150pF

R6-28=10Kohms

C11=12nF 100V

C25=150pF

R7....17=1Kohms

C12=6.8nF 100V

C26=10uF/25V

R18....27=220Kohms

C13=3.3nF 100V

RV1=250Kohms Lin.

C1=47uF/25V

C14=68nF 100V

RV2.....12=4.7Kohms Lin.

C2=47pF

C15=33nF 100V

IC1...3=TL074

C3=150pF

C16=18nF 100V

S1=2X2 SW

C4=1.5uF 100V

C17=8.2nF 100V

J1...3=RCA Jack

C5=820nF 100V

C18=3.9nF 100V

All Resitors is 1/4W 1%

C6=390nF 100V

C19=2.2nF 100V

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6-Band Graphic Equalizer

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6 Band Graphic Equalizer

The EQ-2 it is a circuit of graphic equalizer 6 band of regulation. Each band is regulated from the potesometers RV1-6, that are, for better optical indicate of regulations, Fader. This does not mean that we cannot him replace with simply potesometer. In the center of regulation potesometer, the gain is null (flat), but in terminal has +/- 15 db, boost or cutting off, respectively. For stereo operation, it will be supposed two times.

Part List

R1=47Kohms	C2=15nF 100V	C9=680nF 100V
R2-5-18=150Kohms	C3=150nF 100V	C10=150nF 100V
R3-4=10Kohms	C4=33nF 100V	C11=39nF 100V
R6....17=10Kohms	C5=8.2nF 100V	C12=8.2nF 100V
R19=100Kohms	C6=1nF 100V	C13=2.2nF 100V
RV1.....6=100Kohms Lin.	C7=470pF 100V	C14=470nF 100V
C1=1uF 100V	C8=680nF 100V	IC1-2=TL074

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5 Band Graphic Equalizer

Other one unit of graphic EQ. five bands. The basic difference with the other circuits is, that I use instead of IC, transistor and the power supply, go up in +/- 24V DC, ensuring low distortion and bigger margins of overloading. With switch S1, we can isolate the EQ. inside or except operation, leaving the musical signal to pass without no alteration.

Part List

R1-4-37= 330Kohms	R34= 15Mohms	C12= 4.7nF 100V
R2-7= 2.2Kohms	R35-38= 220 ohms 1W	C13= 1.5nF 100V
R3= 120Kohms	R36= 100 ohms	C14= 470pF 100V
R5-6= 6.8Kohms	C1-3= 1uF 40V	C15= 68pF 100V
R8....12= 1.8Kohms	C2= 68pF 100V	C16-19= 100nF 100V
R13....15= 200Kohms	C4= 220uF 63V	C17-20= 470uF 40V
R16= 180Kohms	C5= 1uF 100V	C18= 4.7uF 63V
R17= 150Kohms	C6= 220nF 100V	RV1....5= 50Kohms Lin.
R18= 1.5Kohms	C7= 47nF 100V	Q1.....7= BC550C
R19....22= 1Kohms	C8= 15nF 100V	S1= 2X2 SW
R23....27= 220Kohms	C9= 5.6nF 100V	.
R28....32= 15Kohms	C10= 47nF 100V	.
R33= 10Kohms	C11= 15nF 100V	.

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3 Band Equalizer

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3 Band Equalizer

A classic circuit of regulation of tone of three way, with which we can regulate low, mid and high frequencies, of acoustic signal. The boost/cut can be regulated in the range of ± 18 dB/oct. In the circuit the supply is ± 15V, but can be also supplied with alone supply + 9 until + 30V, it is enough it is connected pin the 4 IC1, in the 0V and is connected the circuit with as it appears in fig. 2, giving half the supply in the not inverting entry of IC1, in the 5 and 3 equivalents, which are henceforth not connected in the ground.

3 Band EQ with single supply

R1-2= 47Kohms	C1-11= 10uF 25V	C8= 1.2nF 63V MKT
R3-4-5-12-13= 10Kohms	C2= 33pF ceramic	C9-10= 100nF 63V MKT
R6-7= 3.3Kohms	C3= 2.2uF 63V MKT	C12=47uF 25V
R8-9= 1.8Kohms	C4= 47nF 63V MKT	RV1-2= 100Kohms Lin.
R10= 270ohms	C5-7= 4.7nF 63V MKT	RV3= 470Kohms Lin.
R11= 22Kohms	C6= 22nF 63V MKT	IC1= TL072, NE5532

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Parametric MID Frequence EQ

The circuit constitutes a natural extension of Mic-Line balance unit, but can be adapted to any other audio circuit. It is made up of two units in the series : A) A classic unit bass/ Treble and B) a parametric unit of mid frequencies. Both units can also be used autonomously or each one separately, with the required buffer unit, from previous and subsequent circuits. With the R2 we requlate the High frequencies +/- 18 db/oct at 20 KHZ, with R5 the Low frequencies +/- 18bd/oct at 20 KHZ, with R11 the Mid freq. +/- 15 db/oct and with R10 the center of mid freq. at 200 HZ - 6 KHZ band.

Part List

R1-3=2.7 Kohms	R15=100 ohms	C5=10nF 100V MKT
R4=22 Kohms	R2-5-11=47 Kohms Lin. pot.	C6=4.7nF 100V MKT
R6-7=5.6 Kohms	R10=2X100 Kohms Log. pot	C7=10uF25V
R8-9=22 Kohms	C1=2.2nF 100V MKT	C8-9=100nF 100V MKT
R12-13=3.9 Kohms	C2-3=5.6nF 100V MKT	IC 1= NE 5532
R14=47 Kohms	C4=68pF mylar	All Resistors is 1/4W 1%

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Equalizer with Parametric Mid

Circuit diagram

Part list

R1-3=2.7 Kohms
R4=22 Kohms
R6-7=5.6 Kohms
R8-9=22 Kohms
R12-13=3.9 Kohms
R14=47 Kohms
R15=100 ohms
R2-5-11=47 Kohms Lin. pot.
R10=2X100 Kohms Log. pot
C1=2.2nF 100V MKT
C2-3=5.6nF 100V MKT
C4=68pF mylar
C5=10nF 100V MKT
C6=4.7nF 100V MKT
C7=10uF25V
C8-9=100nF 100V MKT
IC 1= NE 5532
All Resistors is 1/4W 1%

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10 Band Graphic Equalizer

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.