Kingrex T20 User manual

Design Consideration of T20 & T20 U AMP
The cabinet is of a rigid construction with elegantly appearance by the size 180*138*45mm with 6mm
thick aluminum face plate which with polished sliver chrome volume control knob in the middle. The stylish
design with the tiny size will bring fun for life. It also contributes to the touch and fell factor and is essential
for the long lasting life even in a tough environment. All the components used in T20 & T20U are of the
highest quality and have been selected through intensive listing sessions from the PCB itself over the high
quality chassis to the anodize gold RCA and SP terminal.
Design consideration of PSU & PSU MKII
All of the audio products (audio amplifier) need current while them working, or there wonít be any good
sonic performance as many detail will lost. So the power source is very important for the amplifiers. There
will be three power sources most in common: switching power adaptor, linear power supply unit, and battery
power supply unit.
The switching power adaptor should be most convenience and common power source the users could
chose however it is not a good selection for music connoisseur who cares the sonic performance much more
than the obtain convenience as it has the most noise and distortion by the high-frequency switching and
harmonics in its design.
The linear power supply should be better choice for audiophiles. It has less noise and distortion than the
switching power adaptor, however, during the AC to DC conversion and rectification process, there is still
unavoidable following the unexpected noise and distortion. That's because the AC power should pass lots of
electronic parts as transformer, diodes, voltage regulators, and components to be the lower current and neat
DC.
For the better sonic performance demand and afford price issue, KingRex design the linear power supply
unit - PSU to fit the demand for high power stream and low noise source.

LINEAR POWER SUPPLY UNIT
MODEL: PSU (13V/3A)
 PSU MK II - THREE POWER OUTPUT SETTING
 (13V/3A , 9V/3A , 5V/3A)
1. Using a 48VA toroidal transformer ensure maximum current output.
2. Using Linear IC regulator circuit
3. 8pcs high quality NIPPON CHEMICON ELECTROLYTIC CAPACITOR total capacity 25100uF
4. 6m/m thickness aluminum face plate.
5. Output voltage:
PSU : 13V/3A
PSU MKII: 13V/3A(for DC 12V series Audio component upgrade)
PSU MKII: 9V/3A (for squeezebox 9V series)
PSU MKII: 5V/3A(for squeezebox 5V series)