Connection With Next Board; Mute Setting; Gain Settings; Dc Offset - Sure Electronics TK2050 User Manual

Hardware Detail

2.4 Connection with Next board

J4 and J2 on terminal block are used to connect more amplifier board.
Connector Mark
J4 VDD
J2 GND
Notice:
It is allowed to connect more amplifier boards in series, but it would be better to limit that number to 4.
Remember to use AWG12-compliant cable or equivalent for series connection.

2.5 Mute Setting

To mute the output audio signal, connect "+5V" and "MUTE" of the terminal block with a piece of
lead. In normal use, "MUTE" shall be left unconnected.
Connector Mark
J6 MUTE
Notice:
When you select power supply for the board, the appropriate voltage is DC 10-36V. Never connect
"MUTE" on the terminal block to any power supply or any other voltage higher than 5V.

2.6 Gain Settings

The on-board 4-slide DIP switch, which is marked as "SW1", is used to set the gain of amplifier
board. 4 slides are marked as K1, K2, K3 and K4 respectively. K1 and K2 are used to set the gain of
channel 1 while K3 and K4 are used for channel 2. The following table lists the gain values on different
settings:
C h a n n l e 1 S e t t n i g
K1 K2
ON ON
OFF ON
ON OFF
OFF OFF
Tips:
High: Portable MP3/CD player with built-in volume control.
Medium: General-purpose use
Low: Preamplifier with fairly high output signal

2.7 DC Offset

If it is not quite necessary, DO NOT trim the output offset by adjusting "R5" and"R26"-two
AA-AB013_Ver1.2_Page 6
Description
Positive (+) of DC 10-36V Power Supply to next board
Negative (GND) of DC 10-36V Power Supply to next board
Description
When "MUTE" is connected with "+5V", both amplifiers will
be muted and enter into idle mode. When connected to
ground or left disconnected, both amplifiers will resume to
regular operation.
C h a n n l e 2 S e t t n i g
K3 K4
ON ON
OFF ON
ON OFF
OFF OFF
A m
Gain Power Gain (dB)
Level Typical
High 24
Medium 30
Medium 30
Low 34
p i f i l r e G a n i
Voltage Gain (V/V)
Typical
16
32
32
48
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