Casio CTK-541 User Manual download pdf (Page 9)

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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 (IC201: TA8248K)

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

The following table shows the pin function of IC201.

Pin No. Terminal In/Out Function

1 NC — Not used

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

3 OUT2 Out Channel 2 output

4 VCC In +9 V source

5 OUT1 Out Channel 1 output

6 B.S.1 — Terminal for a bootstrap capacitor

7 Power GND In Ground (0 V) source

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

9 DC — Terminal for a decoupling capacitor

10 NF1 In Negative feedback input

11 IN1 In Channel 1 input

12 IN2 In Channel 2 input

13 NF2 In Negative feedback input

14, 15 Pre GND In Ground (0 V) source

Amp.

TA8248K

Filter

Block

CPU

MSM6755B-17

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 24 25

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Casio CTK-541 User Manual Page 9