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Class D Audio Amplifier Board - TDA7492
©
2004-2011 Sure Electronics Inc
AA-AB32189 & AA-AB32174 & AA-AB34165
_
Ver1.0_Page 8
supply voltage once the input signal reaches the peak.
Take
AA-AB32189 for example, the maximum amplitude of the input signal is no more
than 320mV RMS when power supply voltage is 36V, load impedance is 6 ohm and the
gain is set at 37.6 dB. The other circumstances can be referred to the input sensitivity
from
TABLE 3-1 ELECTRICAL CHARACTERISTICS
FIGURE 2-5 VOLUME CONTROL
TABLE 2-8 DIP SWITCH SETTING
Switch K1 K2 Gain
Status(dB)
ON ON Weak
ON OFF Low
OFF ON
Medium
SW2
OFF OFF High
2.6 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
when hooking up the amplifier and you may readjust the volume when you are sure that
the amplifier is functioning properly.