Hardware Detail
© 2004-2009 Sure Electronics Inc.
AA-AB013_Ver1.2_Page 7
potentiometers on board since we have already regulated that offset to a range of +/- 10mV. You may
refer to the connection diagram for the location of potentiometers.
Warning:
Adjusting these potentiometers may damage your speakers.
2.8
LED Indicators
This amplifier board has two indicators, one of which is marked as “Power (D3)”; another is “Hmute
(D4)”. The power indicator will be illuminated in green on power-up and “Hmute” will be illuminated in
blue when you mute the amplifier audio output or amplifier board error occurs. Please refer to the
TK2050 Data Sheet for a complete description of HMUTE. Please refer to the Board Connection
Diagram for the LED locations on amplifier board.
2.9
Volume Control
This amplifier board doesn’t include any potentiometer which could be used to manually adjust the
volume control. Users may use the volume control of the sound source (such as MP3 player or PC) to
adjust the loudness of the audio output. If you need a potentiometer, you may install one (50Kohm) by
yourself, but it may void the warranty at the same time. Another reason for not installing potentiometer
is the signal attenuation it may occur after installation. To compensate that attenuation, adjusting the
gain value is required. You may refer to 2.6 Gain setting for details.
Please be aware that audio clippings (waveform distortion) may occur for some portable players, these
are the clippings generated by the audio source, not the amplifier itself; please increase the input gain
of amplifier board.
