Audio Engineering

Preamplifi ers and Input Signals 235









‘L’ input

‘R’ input ‘R’ output

‘L’ output

2K2

2K2

100 μ

0V

1K

4K7

1K

Relative gain  6dB

Figure 7.69 : Negative feedback type channel balance control.



 









1 M 10 pF

10 pF

2K2

R

R

R

R

4K7

E

E

10 K

10 K

E

1M E

1M0

L-channel input 1M0

R-channel input

‘L’ output

‘R’ output

Figure 7.70 : Circuit for producing enhanced or reduced stereo channel separation.