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What's different between
Class A PSU and Linear PSU ?
1, The different like the class A amp than the class B amp .The Class A
PSU is a class A design PSU, it suit the small current request
circuits, like DA chip, OPAs, DAC output stages , preamp gain stage.
The Linear PSU is the linear design, it can output large current less limit.
2, In sound, the Class A PSU have more neutral, more extend , blacker
background .
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Manual
AC IN: Connect the transformer AC output.
V- OUT : Negative voltage output.
GND : On bard the two PSU is separate, if users use for power
supply same circuit parts, please connect the two GND together， then
connect to the circuits.
V+ OUT : Positive voltage output.
J1: Default is setting on 80MA idle, short the J1 but solder or jumpers
for boost to 160MA idle .
J2: If short the J1 still not enough, short both J1 and J2 for boost to
240MA idle. (Short the J1 and J2 each other, you can't short the 4 pins
together )
J3: Default is connect, the Vref is from a pair transistors , sound
detail , dynamic without harsh.
J4 : Change the Vref to a pair LED . Replace different LED have
different sound flavors. The default LED sound clear, detail, brighter
than the transistors Vref .
We test with different LED, the high blue LED have emphasize on bass,
sound thick and rich , like the old KRELL class A amp sounding.
Must read before operate :
1, Once you get the PSU2013, before connect in circuits, please connect
the proper transformer and have a quickly check the DC output if extra
as your order . Class A PSU can't long term power on without load
circuits.
2, If you want to change the Vref to LED, you MUST disconnect the
circuits from the PSU2013, power off the transformer, disconnect J3,
solder connect J4 steady , The transistor and LED have different voltage
while as the Vref, so want to adjust the blue potentiometer get
the proper output voltage, then connect the circuits again .
3, If you ensure the J1 or J2 want to short after test , we are advice
you are better solder short them rather than use the jumpers.
4, All kits have test before shipping, and this is for DIY, so have not
warranty on the kit .
5, The heat sinks have connected to GND, so take care while install in
the gear.
6, The adjustment resistor can adjust the output voltage, if you have
not enough experiences, don't adjust it , we have adjust to standard
output before shipment.
7, Connect by wrong will shatter the PSU or the gear.
8, While the PSU working will have some heat .
9, Users can setting between 80,160 and 240MA to try which one sound
better for personal taste. But if setting on higher current, take care
the heatsinks , the heatsinks can working under 85 Celsius safe . (DON'T
rudely put your finger on the heatsinks, 60 celsius already make finger
feel pain ) |
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The advantage of the Class A PSU :
The Class A design always is
the best design in audio field .
The class A PSU had some
limit , the heat is a little hotter than the normal PSU ,
the output current have limit , but
these all are not the points, it have the most neutral sound reproduce
keep most DIYers like to applied it in their gears.
The Class A PSU had
very high input impedance and low output impedance can avoid power
disturbs . It working at class A state , have the fastest output current
response.
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