Do no remove this cover under any circumstances

[everell]

Just couldn't resist....here is a Dynex DX-PS300W.......with cover removed!

[Th3_uN1Qu3]

Re: Do no remove this cover under any circumstances

I've seen worse.

[everell]

Re: Do no remove this cover under any circumstances

I was referring to the writing on the label on the case. It says "Do not remove this cover under any circumstances". LOL! Once inside it is just a cheapo half bridge configuration with KA7500 pwm chip, 2 transistor 5vsb circuit, and primary caps are 330 uF. I doubt that it would stand up to 300 watts.

[goodpsusearch]

Re: Do no remove this cover under any circumstances

"Fan controlled Power Supply"?

So, the fan controls the psu?

[Pyr0Beast]

Re: Do no remove this cover under any circumstances

I was referring to the writing on the label on the case. It says "Do not remove this cover under any circumstances". LOL! Once inside it is just a cheapo half bridge configuration with KA7500 pwm chip, 2 transistor 5vsb circuit, and primary caps are 330 uF. I doubt that it would stand up to 300 watts.

It would be good for 150-200W. It seems quite decent psu.

KA7500 is TL494 under a different name.

It has good input filtering, lots of heatshrinking, good quality soldering, output filtering and perhaps what I see even 5Vsb made with a linear regulator. It even has a fan connector, very nice. Shielded caps from input transitors/Fets and an input switch. LM339 for Overvoltage protection. Recap and it should run fine.

I have seen PSU's made far worse. No output chokes, input RFI filters were just wires, underrated resistors.

[goodpsusearch]

Re: Do no remove this cover under any circumstances

I hope there is plastic insulation among the pcb back and the metal case...

It could do 300W if the input caps are replaced with 680uF and the primary transistors are something like 13009 or better.

I would also check the secondary silicon and recap the output caps with 2x2200uF for every output (3.3V, 5V, 12V) just to be safe

[everell]

Re: Do no remove this cover under any circumstances

"Fan controlled Power Supply"?

So, the fan controls the psu?

That too is funny. I wonder who thinks up such "technical" information to put on labels.

[Th3_uN1Qu3]

Re: Do no remove this cover under any circumstances

Translations from Chinese to Engrish are always funny.

[Rulycat]

Re: Do no remove this cover under any circumstances

What brand are those primary caps? GSC?

[Th3_uN1Qu3]

Re: Do no remove this cover under any circumstances

I see HEC.

[370forlife]

Re: Do no remove this cover under any circumstances

KSC. Very low end huntkey. Knowing huntkey its a 200w, 300w peak.

[Th3_uN1Qu3]

Re: Do no remove this cover under any circumstances

I wouldn't call anything with a transient filter "very low end". Though agreed, that won't do more than 200-250W.

[c_hegge]

Re: Do no remove this cover under any circumstances

Looks similar to this.

[everell]

Re: Do no remove this cover under any circumstances

Yes, the two power supplies do look very much alike. In fact, the part numbers on the three transformers between the heat sinks are identical!

The primary caps are HEC 330 uF/200 volts

[Agent24]

Re: Do no remove this cover under any circumstances

I was referring to the writing on the label on the case. It says "Do not remove this cover under any circumstances".

Yeah, do not remove cover lest you notice how crappy the PSU is.

[Pyr0Beast]

Re: Do no remove this cover under any circumstances

Yeah, do not remove cover lest you notice how crappy the PSU is.

You might get electrocu ... err, shocked !

[dood]

Re: Do no remove this cover under any circumstances

I have a picture around here somewhere of a crappy PSU that actually had this STAMPED in the metal - "Do not screw off!", with an arrow pointing to a screw.