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Parametric Mid EQ

2017-12-22 20:35  
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Parametric MID Frequence EQ

parametric_mid_eq.gif (11809 bytes)

?? ??????? ???????? ?????? ????????? ??? 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 ofMic-Line balanceunit, 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 KohmsR15=100 ohmsC5=10nF 100V MKT
R4=22 KohmsR2-5-11=47 Kohms  Lin. pot.C6=4.7nF 100V MKT
R6-7=5.6 KohmsR10=2X100 Kohms   Log. potC7=10uF25V
R8-9=22 KohmsC1=2.2nF 100V MKTC8-9=100nF 100V MKT
R12-13=3.9 KohmsC2-3=5.6nF 100V MKTIC 1=NE 5532
R14=47 KohmsC4=68pF  mylarAll Resistors is 1/4W 1%

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