Casio ap-21

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POWER SUPPLY CIRCUIT
The power supply circuit generates five voltages as shown in the following table.
Name Voltage For operation of
VDD +5 V CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM,
Key touch LSI, Gute array, LEDs
AVDD +5 V DAC
AVCC +15 V Filter, Mixer
AVFF -15 V Filter, Mixer