Preamplifi ers and Input Signals 233
100 K100 K 10 K 100 K10 K10 K22 K10 K
0V0V0V0V100 K470 K0.22μ470 K47 K4n7 4n747 K
27 K‘Freq’Ein Eout‘Q’‘Lift’ ‘Cut’Figure 7.67 : Parametric equalizer circuit.10 K100 K100 K100 K100 K
10 K
10 K
10 K10 K
10 K
10 K
10 K220 K220 KCCCCL 1 L 2 L 3 L 4Ein Eout0Vetc.
To other segments
‘Lift’ ‘Cut’f 0 ^1
2 π LCFigure 7.68 : Circuit layout for a graphic equalizer (only four sections shown).