Displaying reviews posted
by certified DX gadget owners first, followed by all other posted reviews.
Nice AC-DC PS
Posted by
id507
on 2/10/2010
Involvement:
Expert (understands the inner workings)
- Ownership:
1 week to 1 month
|
Price:
|
|
|
Ease of Use:
|
|
|
Build Quality:
|
|
|
Usefulness:
|
|
|
Overall Rating:
|
|
Pros: This AC-DC converter is quiet small and in accordance to it component do it's job.
the current is a bit low, measured with serial 3*13664:
current:290-300mA with output 3.2V.
I expected it to heat, according to about 68% efficiency @ 2.7W, it has 0.8W heat, yet the AC-DC didn't more then 50degC.
The PCB is not clean, and the input and output wires too short. I needed to replace those wires to longer wires.
Cons: very small made specially for set above sealing. Do it job, thus i would accept a higher output current.
Bottomline: Do it job, thus i would accept a higher output current.
Mine are near 75% efficency
Posted by
tonix1
on 2/16/2009
Involvement:
Expert (understands the inner workings)
- Ownership:
1 week to 1 month
|
Price:
|
|
|
Ease of Use:
|
|
|
Build Quality:
|
|
|
Usefulness:
|
|
|
Overall Rating:
|
|
Pros: The one I have tested give me the following:
Input 234,5V @14,35ma=3,36W
Output 9,32V @282ma 2,679W
EFFICIENCY = 75%
(indeed the current measurement is variable, it start from 284ma to decrease costantly, I consider an average value)
Very small, fits even DIY lamp, perfect to build ligthing with power leds.
Good building quality (I don't know single component quality).
Wiring is indicated DC OUTPUT= white negative- pink positive. AC Input= the white wire couple opposite side of the PCB.
Cons: Output Current should be higher, I would try to change something on the circuit, probably lower an output resistance by parallel another on top,if I only had a circuit schematic. EG. CIRCUIT SCHEMATIC would be welcome.
A mark on the PCB to remember the model.
Other Thoughts: The circuit it is just a little step behind a very good one, A 15% ENHANCEMENT OF EFFICIENCY would be just good enough.
Bottomline: a good choice to experiment with power led, a convenient way to build some nice home lighting.
Led light your home.
Posted by
Dominik
on 7/14/2008
Involvement:
Expert (understands the inner workings)
- Ownership:
1 day to 1 week
|
Price:
|
|
|
Ease of Use:
|
|
|
Build Quality:
|
|
|
Usefulness:
|
|
|
Overall Rating:
|
|
Pros: Small, easy to use, more efficient than it's small brother 1x1W. Using E27 DIY bulb and MR11 triple mcpcb & optics you can make 3x1W bulb for 20$.
Cons: Still too low efficiency - when you are using super efficient LED's you are expecting to get super efficient light source and here you will have only about 300 lumens from 6,76W of power, it means only 44 lumens/W when new leds could give you 100 lumens/W @ 350mA...
Other Thoughts:
Bottomline: IN 30,15 mA @ 224,53V => 6,76 W
OUT 309,5 mA @ 9,54V => 2,95 W
Eff : 43%
When it will achieve 80% efficiency it will be the straight way to LED based home lightning. Now it's god for fun, experiments and LED maniacs.