Power supply build quality pictorial. part 2

[japlytic]

Sanyo MBC-5130 (Volgen MBC-5030)
Unless noted, all electrolytic capacitors are Marcon US Series except for one 1000uF 10V NTK unit on the primary side.

6J4B41 input rectifier
AC10D AC input range switching TRIAC
2SC3153 x2 main switchers
2SC3178 control supply switcher
ESAD83-004 +5V rectifier
ESAC33-02 +24V rectifier
ESAC33-02 disk drive +12V rectifier (? - missing)
2SA1308 motherboard +12V DC-DC converter

680uF 200V Nitsuko PNH x2 primary filter
2200uF 10V x2 before +5V output fuse with 1000uF 10V after it
470uF 25V before -12V regulator with 220uF 25V after it
470uF 35V before motherboard +12V DC-DC converter with 2200uF 25V after it before output fuse with 470uF 25V after it
470uF 25V x2 before disk drive +12V fuse with 470uF 25V after it
470uF 35V on +24V before output fuse with 470uF 35V after it
330uF 25V on control B+

[Wester547]

Re: Power supply build quality pictorial. part 2

You are right, in my rush to post the PSU I mistook it for the earlier versions (made for the Dell Dimension 8100 or Optiplex GX400) which did use a proprietary pinout and/or a 24-pin connector. This unit uses a standard 20-pin connector and an unusual “Dell” ATX housing.

[momaka]

Re: Power supply build quality pictorial. part 2

I've got a decently build AT PSU:

SP2-425F EMACS.
...
I haven't a clue who is the OEM. 1999 date code on the pcb.

That's a very nice PSU, and not just for an AT PSU. Sure it's an old half-bridge platform, but it's built properly, unlike 99.9% of the cheap bargain units that use this topology. I bet it would do rated label power and then some more (probably 250-270 Watts.) The primary transistors and main transformer for sure shouldn't have any issue with that. And even the output caps would give very quiet output, if they were still good.

Definitely worth a recap for an old AT system.

BTW, OEM for EMACS is EMACS - that is, they make their own PSUs... and from reading threads / articles back in the day (early 2000's), they were always nice units and never compromised on quality (well, caps aside, but which PSU manufacturer didn't dabble with that.)

No-name special

Why is it special? The insides shall tell you everything.

https://www.badcaps.net/forum/attach...1&d=1694972597
https://www.badcaps.net/forum/attach...1&d=1694972597

No case swap involved, that is really how I found it, in a rather nice MSI K8T Neo-FIS2R + NX6600GT AGP custom build.

FWIW, according to the fuse chart, this thing is realistically just 50W short of its rated power. Not bad, unlike most china specials I've had to work with.

Happy for you, as this is a nice change from the usual Deers and Sun Pro's you get.

NPS-330CB L Revision 01 (330W maximum) manufactured by Newton Power, made in Thailand during the fifteenth week of 2003.

Exceptionally well-built PSU! Nothing else to say, really.

BTW, are you sure the main connector uses proprietary pinout? Looks like a standard 20-pin ATX connector to me.

[Wester547]

Re: Power supply build quality pictorial. part 2

NPS-330CB L Revision 01 (330W maximum) manufactured by Newton Power, made in Thailand during the fifteenth week of 2003. In accordance to the label, +5V is rated for 28A, +12V rated for 18A, +3.3V rated for 18A, -12V rated for 1A, and +5VSB rated for 2A. No combined rating for the +5V and +3.3V rating is given on the label, but it should be less than 200W combined going by the +5V and +3.3V ratings alone. Internally, there is a 30mm diameter 330uF 450V Nichicon LU primary filtering capacitor. The transient filtering stage features four Y capacitors, two X capacitors, three coils including the APFC filtering coil, an NTC thermistor, a single MOV, etc. The topology appears to be double forward topology.

There appears to be two IRFP450LCs as the main switchers and APFC transistors, and a STVA806D as the APFC rectifier. KBU 8K (8A/800V) on a heatsink is the bridge rectifier. The fuse appears to be a high breakage capacity type, although I couldn’t determine the actual rating or whether it was a slow or fast blow type as it wasn’t visible on the fuse or on the PCB. LM324N appears to be the primary side controller, with a typical freestanding IRFBC20 being the +5VSB primary side switcher. The main transformer is 35mm wide and the standby transformer 16mm wide. Four optocouplers are also present manufactured by Vishay. The secondary side has a TSM1002DS supervisor chip and two LM324N quad comparators.

A 10mm 2200uF 10V Nichicon PW with a 470uF 10V Rubycon YXG after the coil filters the +5VSB output. A 12.5mm 3300uF 10V Rubycon YXG before and after the coil filters +3.3V, with the same arrangement for +5V except another 10mm 1500uF 10V Nichicon PW after the coil. -12V has one 10mm 1000uF 16V Rubycon YXG before the linear regulator and one 8mm 470uF 16V Nichicon PW after it. +12V has one 10mm 1500uF 16V Chemi-con KY and another Rubycon YXG of the same values and dimensions in parallel, and shunt for overcurrent protection. Some of the tiny capacitors look to be LTEC TK. The secondary side rectifiers are one STPS3045CW for +3.3V, one L7912CV for linear regulating -12V, two MBR3045PTs (one on the high side and low side) for +5V, and two STPR1620CTs for +12V (one on the high side and one on the low side). The underside obviously looks pristine in terms of soldering quality. Both the primary and secondary side daughter boards and input sister boards appear to use the phenolic FR1 or FR2 PCB material (and both daughter boards have SMD components on them) while the main PCB appears to use a more expensive fiberglass epoxy material (FR4?) with clearly no SMD components on the underside. The fan is a Nidec D08T-12PU ball bearing fan rated for 3400RPM, 44CFM, and 34DBA, and is surprisingly quiet for the amount of air it pushes at the speed it spins. The heatsinks are obviously massive in both surface area and base thickness. Both the +5V and +3.3V output toroids seem to use -52 material, with the +5V toroid probably being T130-52 in particular.

The output wires appear to be a somewhat proprietary “24-pin” affair on the main connector, with all wires being 18 gauge except the +3.3V wires which are 16 gauge and the floppy wires which are 22 gauge. There are five molex, one floppy connector, two SATA with an adapter, one ATX 12V, and one main ATX connector, all manufactured by Unicab. The ventilation is ample with a honeycomb grille. All in all, the unit is internally quite similar to the NPS-250DB previously posted here, but a bit “upgraded” as it’s a higher wattage supply.

[370forlife]

Re: Power supply build quality pictorial. part 2

Yuelin aren't the worst units I have seen. I would put them below sunpro, though.

[Dan81]

Re: Power supply build quality pictorial. part 2

Coolmax uses (or at least use to, been about 10 years since I got into one,) Yuelin. The seemingly now defunct Broadway Comm Corp also used them.

Yuelin? I always thought their units ranged between Sun Pro's AT-2005B and ATNG units.

[370forlife]

Re: Power supply build quality pictorial. part 2

I've got a decently build AT PSU:

SP2-425F EMACS.
Has an automatic input voltage selection circuit.
Very decent EMI input filtering.
Input buffer capacitors are Rubycon USR 680uF.
Half bridge switching two 2SC2625 NPNs.
Center tapped 44 size main transformer.
Some of the output capacitors are swollen, all PCE-TUR .
TL494 PWM for primary switching.
LM339 in the secondary for protection and voltage supervision.
Lots and lenghty peripheral conectors. AWG 18 wiring.

I haven't a clue who is the OEM. 1999 date code on the pcb.

Emacs rolls their own and they are usually quite good quality workstation/server grade units.

[370forlife]

Re: Power supply build quality pictorial. part 2

The design looks very similar to a Coolmax 600w PSU i picked up a while ago and have been meaning to post here for just as long, even though i have everything i want to say about it written down, the only reason i haven't put a post together yet is because i wanted to remove a couple of parts to get a look at their part#.

Coolmax uses (or at least use to, been about 10 years since I got into one,) Yuelin. The seemingly now defunct Broadway Comm Corp also used them.

[Dan81]

Re: Power supply build quality pictorial. part 2

No-name special

Why is it special? The insides shall tell you everything.




No case swap involved, that is really how I found it, in a rather nice MSI K8T Neo-FIS2R + NX6600GT AGP custom build.

FWIW, according to the fuse chart, this thing is realistically just 50W short of its rated power. Not bad, unlike most china specials I've had to work with.

[pdavid]

Re: Power supply build quality pictorial. part 2

I've got a decently build AT PSU:

SP2-425F EMACS.
Has an automatic input voltage selection circuit.
Very decent EMI input filtering.
Input buffer capacitors are Rubycon USR 680uF.
Half bridge switching two 2SC2625 NPNs.
Center tapped 44 size main transformer.
Some of the output capacitors are swollen, all PCE-TUR .
TL494 PWM for primary switching.
LM339 in the secondary for protection and voltage supervision.
Lots and lenghty peripheral conectors. AWG 18 wiring.

I haven't a clue who is the OEM. 1999 date code on the pcb.

[Dan81]

Re: Power supply build quality pictorial. part 2

It's also sold under the KRPW/Kuroutoshikou brand in Japan I think? I remember Tech YES City getting one and straight away I noticed it was the same Andyson platform as my RX-700AC.

They're good PSUs honestly - this lil' bugger managed to power a R9 280x, Phenom X6 1055T, 5x 1TB HDDs and a DVD-ROM without breaking a sweat! I've set it aside for a Athlon 64 x2 4600+ 939 build w/ a 8800GTX.

Maybe it's me, but it seems XHY and Andyson really are capable of making good units. The XHY-based unit I have is a 750W Intertech FP-750W w/ a 14cm fan, and even that one is a powerhouse, despite the PCB itself being rated for 400W - I'm fairly sure that's just the design they used, as the sillicon inside does look enough for pulling upwards of 550W to 650 in the actual configuration. Only the caps are a bit sus on it - BH/Nicon. It was lightly used though - the unit I pulled it from didn't have much inside, aside from a MSI P55-CD53 and a i5 750.

[RukyCon]

Re: Power supply build quality pictorial. part 2

The design looks very similar to a Coolmax 600w PSU i picked up a while ago and have been meaning to post here for just as long, even though i have everything i want to say about it written down, the only reason i haven't put a post together yet is because i wanted to remove a couple of parts to get a look at their part#.

[Dan81]

Re: Power supply build quality pictorial. part 2

Raidmax RX-700AC. Not 700W by any means, but my guess would rather be somewherenin the 400-500 range. APFC design, Teapo caps all around, pretty good heatsinks.

Considering I had to choose between this and a Gigabyte P650B, I'm rather happy I went with the Raidmax. They really have improved over the years. Not much, but it is quite a lot when you consider they were pushing absolute safety hazard Sun Pro units (I still have the casing from one, currently houses a Spire Jewel inside.) - maybe Corsair's roast taught them something?

And to end this post on a good note - is it me, or did they copy a FSP design? It kinda reminds me of the 60GLN series.

[Dan81]

Re: Power supply build quality pictorial. part 2

Looking at that SEGOTEP "500W" P/S, the input lytic, TO-220 switch devices, heatsinks, and output inductors (-26 material, suggesting transistors and a switch frequency under 50KHz, probably 70%-75% efficiency) look more suited to 235W-250W continuous.

I'd be careful pulling more than 180W max from that.

[leotron]

Re: Power supply build quality pictorial. part 2

Since the segotep doesn't have anything below the board my dream on building power ful PSU is become a reality

[PeteS in CA]

Re: Power supply build quality pictorial. part 2

TL494 & clones are cheap, well known, and the design engineering effort is comparatively minimal. The downside is that TL494 & transistors half bridge designs are relatively low efficiency (70%-75% was good, ca. 1980, but that was >40 years ago). Really good efficiency nowadays means using phase modulation, quasi-resonant inverters, and synchronous rectifier MOSFETs.

[eccerr0r]

Re: Power supply build quality pictorial. part 2

btw that TL494 PSU above, measured 72W at the wall, 13.2V@4A output to a head light bulb=52W = 73% efficient... not so great but meh.

KA7500/TL494s are everywhere... just don't see any 78S40s ...

[RukyCon]

Re: Power supply build quality pictorial. part 2

I'm surprised that companies still use TL494 or equivalents as the backbone of some more modern power supplies, when it seems like it would be cheaper to use something like 384x series parts (unless I'm wrong).

And just for example. Last year, I took apart a dead water bottle cooler I found in the trash (possibly made around mid-2010s, outward design seemed pretty modern), and the main PS board (12v, possibly 100w max) relied on a KA7500 as the main controller.

Oh, and the reason it was dead was because the only secondary capacitor had failed (can't remember the series, but it was an Aishi 2200uf 16v).

[eccerr0r]

Re: Power supply build quality pictorial. part 2

And nowadays people are thinking TL494? Too many pins!

[PeteS in CA]

Re: Power supply build quality pictorial. part 2

The self-oscillating start-up was new to me until 1997 or 1998 when I saw the restart after power-off thingy happen with a Mitac power supply I was testing while working at Sun Microsystems.

My experience with voltage mode PWMs has been mostly with 3524 family ICs rather than TL494 types. TL494 types have been around since the 70s, and 384# family types since the 1980s. They're good examples of devices that are just too effective in performance and cost to become obsolete after a short time.