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.
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%
