Parametric MID Frequence EQ

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�� ������� �������� ������ ��������� ��� Mic-Line Balance , ���� ������ �� ������������ �� ����������� ���� ������� ����. ����������� ��� ��� ������� �� ����� : �] ��� �������� ������ Bass/ Treble ��� �] ��� ������ ������������ �������� ��� ������� (MID) ���������� .�� ��� ������� ������� �� ��������������� ��� ��������, � ���� ��� ���������, �� ��� ��������� ��������� , ��� ����������� ��� ������� ���������. �� �� R2 ���������� ��� ������ ���������� (TREBLE) +/-18 dB/oct at 20 kHz , �� �� R5 ��� ������� (BASS) +/-18 dB/Oct at 20HZ , �� �� R11 �� ������ ��� ������� (MID)+/- 15dB/oct ��� �� �� R10 �� ����� ��� MID ��� 200�� - 6 ���.

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%

Sam Electronic Circuits 8/01

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