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TDA7404D

1.8.2 Center Frequency

Figure 13 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz.

Figure 13. Treble Center Frequencies @ Gain = 15dB

1.9 External AC - Coupling

TDA7404D has external AC - coupling terminals which can be selected one of two positions behind the Mixing

stage or Bass filter.

Figure 14. External AC - Coupling

















-

-

b

a

b

a

SW2

SW1

SOUND

EFFECTS

Volume & Filter

ACC selector

Input

Speaker

ACOUT

ACIN

Mixing

Stage

SW3

SW4