16 Dec, 2014 Rakesh Sharma
Guides .
First look.
This PSU cost me only Rs.500. The only reason I chose this PSU is that at least it looks like they have labeled it’s power handling correctly. It can handle 200Watts max.
The overall PSU design is not all that bad. Since there is no PFC and EMI circuit, resulting in only a 150W load handling capability.
Inside of the case.
First impression, many components on the PCB are missing. Mainly the surge protection section is not there.
In the name of protection we are having a main fuse and inrush current limiter (an NTC)
Poor primary capacitors
No Fan connector, but at least a thermal sensor for fan speed regulation.
Low capacity and poor quality secondary capacitors
Missing 3.3 voltage filter coil.
Now I will be adding all the surge protection components, replacing primary and secondary capacitors to reduce voltage ripple. Since secondary is having all labeled 1000uf capacitors (I am sure they are even lower in capacitance), I will be replacing them to at least 2200uf or more according to the space available on the PCB.