4 X 100Watt Class D Audio Amplifier Board - TDA7498
© 2004-2011 Sure Electronics Inc.
A-AB33184_Ver1.0_Page 8
TABLE 2-4 DIP SWITCH SW1/SW3 SETTING
Switch K1 K2 Gain Status(dB)
ON ON Weak
OFF ON Low
ON OFF Medium
SW1/SW3
OFF OFF High
2.6 Mode Selection
The three operation modes of this board are set by the DIP switch SW4.
y Standby mode: all circuits are turned off, very low current consumption.
y Mute mode: inputs are connected to ground and the positive and negative PWM
outputs are at 50% duty cycle.
y Play mode: the amplifiers are active.
FIGURE 2-6 MODE SELECTION
TABLE 2-5 DIP SWITCH SW4 SETTING
Switch K1 K2 Mode
X (don’t care) ON Standby
ON OFF Mute
SW4
OFF OFF Play
2.7 Notes
In order to protect amplifier board and extend its service lifetime, please read the
following warnings carefully since warranties will be voided if you do not observe the
following warnings:
Warning 1:
Quality-related issues caused by potentiometers installed by buyers.
Warning 2:
In order to achieve a better sound quality, please use stable power supply since a bad or
unstable power supply may worsen the sound quality or even cripple the amplifier board.
Warning 3:
Never equip a pre-amplifier to the audio input since the amplifier itself has powerful
amplification ability and a high signal input will burn out the amplifier chip.
Warning 4:
In order to protect amplifier and speaker, please turn the volume output to the minimum
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