Casio CTK-411 User Manual download pdf (Page 8)

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FILTER BLOCK

Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.

POWER AMPLIFIER (IC101: LA4598)

The power amplifier is a two-channel amplifier with standby switch.

The following table shows the pin function of IC101.

Amp.

LA4598

Filter

Block

CPU

MSM6755C-17

Pin No. Terminal In/Out Function

1 Power GND In Ground (0 V) source

2 Ch1 B.S. — Terminal for a bootstrap capacitor

3 Ch1 OUT Out Channel 1 output

4 VCC In +9 V source

5 Ch1 N.F. In Negative feedback input

6 Ch1 IN In Channel 1 output

7 D.C — Terminal for a bootstrap capacitor

8 Pre GND In Ground (0 V) source

9 Stand by In Power control signal input. 0 V:Off, +9 V: On

10 Ch2 IN In Not used. Connected to ground (0 V)

11 Ch2 N.F. In Negative feedback input

12 Ch2 OUT Out Channel 2 output

13 Ch2 B.S. — Terminal for a bootstrap capacitor

14 NC — Not used

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 18 19

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Casio CTK-411 User Manual Page 8