Audio Engineering

Figure 7.73 : Steep-cut fi lter circuits.





0.22μ

0.22μ

4 μ 7

6K8

3K3 10 K

Ein

Eout

0V

f 1  30 Hz 20 dB/octave

High-pass

(a)





0.012μ

33 K

Ein

Eout

0V

2K2

2K7

1nf

1nf

f 0  10 kHz 20 dB/octave

Low-pass

(b)

Ein Eout

0V

Low-pass

L

R

C (^1) C 2 C 3
f 1  2 π 1 LC
(c)
10
 18
 12
(a) (b)
 6
0
Transmission (dB)
15 30 100 1 K
Frequency
10 K 20 kHz
Figure 7.74 : Characteristics of circuits of Figures 7.73(a) and 7.73(b).