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Search: Posts Made By: PeteS in CA
Forum: General Electronics Technical Discussion 09-17-2020, 12:22 PM
Replies: 9
Views: 122
Posted By PeteS in CA
Re: Regarding switching Power supplies

Several factors are in play, but the basic answer is that for any specific design there is a practical limit to the adjustment range. On the other hand, with some significant component changes...
Forum: General Capacitor Questions & Issues 09-15-2020, 05:20 PM
Replies: 7
Views: 210
Posted By PeteS in CA
Re: Replacement Chemicon SMG caps

SMG is UCC/NCC's general purpose series, not low quality. And it looks to me like they are being used appropriately.

That said, just about any of the good brands' non-aqueous low impedance series...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-02-2020, 12:29 PM
Replies: 8
Views: 710
Posted By PeteS in CA
Re: HiPro HP-P3017F3 rev:03 [Dell H057N] - capacitor repair

In server-grade PSUs fan speed is often controlled by a microcontroller that also controls the output regulation and supervisory functions such as over-current and UVP/OVP protection.

In the case...
Forum: General Capacitor Questions & Issues 09-02-2020, 12:21 PM
Replies: 26
Views: 683
Posted By PeteS in CA
Re: 3300uf 6.3v for xbox

Placing caps close to varying and pulsing loads decreases the trace resistance and inductance between the load and the energy stored in the capacitor. With ICs with very fast high magnitude load...
Forum: General Electronics Technical Discussion 09-01-2020, 06:31 PM
Replies: 3
Views: 146
Posted By PeteS in CA
Re: Amp limiting controller?

A "resettable fuse" usually means a positive temperature coefficient thermistor that is low resistance until a particular current threshold is exceeded, at which point it goes high resistance. After...
Forum: General Capacitor Questions & Issues 08-31-2020, 11:59 AM
Replies: 6
Views: 165
Posted By PeteS in CA
Re: Need help finding this capacitor.

"CD294" seems to be an Asian (Chinese? Taiwanese?) generic spec for fairly high performance, 105C, higher voltage, snap-in electrolytics. In nosing around, I didn't see the third lug on other CD294...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-26-2020, 12:33 PM
Replies: 20
Views: 538
Posted By PeteS in CA
Re: Burning Machine Computer Switching Power Supply did not end up in landfill

How old is that PSU? Based on the several rated currents, I'd guess ca. 1999.
Forum: General Capacitor Questions & Issues 08-25-2020, 04:02 PM
Replies: 3
Views: 221
Posted By PeteS in CA
Re: Elite Brand Capacitors

This is the company who makes Elite brand capacitors, http://www.chinsan.com/products/aluminum-electrolytic/radial-lead-type-general/ . I don't see a PB series, however. I'm guessing that MB is on...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-24-2020, 01:48 PM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Concur with momaka about that "550W" PSU. No way that thing could do 550W continuous. The topology looks like a half bridge, and between using BJTs and the -26 material inductor cores I'd guess the...
Forum: General Capacitor Questions & Issues 08-24-2020, 01:25 PM
Replies: 26
Views: 683
Posted By PeteS in CA
Re: 3300uf 6.3v for xbox

The inductor core looks like Micrometals Type 52. I'd guess the switch frequency is around 200KHz. Also, the original Xbox, IIRC, is a late 90s design, so ultra low impedance types probably would not...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-17-2020, 03:13 PM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

The PCB date code is 1998 (3398). The 2.5A 5VSB seems more along the lines of what I'd expect for 2000 or later. The heatsinks and main transformer seem about right for 250W-300W. With 500W you get...
Forum: General Capacitor Questions & Issues 08-11-2020, 04:21 PM
Replies: 36
Views: 3,389
Posted By PeteS in CA
Re: Panasonic FC series - leaking? quality gone?

The PJ series is between the PL series and the PW series chronologically, I believe. I think the PR series is contemporary with the PL series. The PM series is the RoHS-compliant version of the PL...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-10-2020, 12:45 PM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Those heatsinks and a pair of true 330uF input caps might be adequate for 200W continuous, but 220uF input caps and that tiny main transformer probably make 160W-180W a more realistic maximum.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-05-2020, 03:35 PM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

It'd probably do 250W without glowing or blowing up, but that is cheap junk. EMC nightmare, lousy output noise, 85C input lytics, and probably junkalicious output caps.
Forum: Troubleshooting Power Supplies and Power Supply Design 07-27-2020, 11:30 AM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

The thing's 13 or 14 years old (PCB datecode 0638), so it lasted a while. But the heatsinks and main transformer put it in the 200W-250W range, IMO. It's be an EMC nightmare, and the output noise...
Forum: General Capacitor Questions & Issues 07-22-2020, 05:52 PM
Replies: 15
Views: 9,739
Posted By PeteS in CA
Re: What can you tell me about Epcos caps?

EPCOS B41859 (Siemens style series name) series is supposedly "Very Low Impedance" and "Very Low ESR", supposedly suited for power supply use. Why anyone would counterfeit an semi-obscure brand...
Forum: General Electronics Technical Discussion 07-20-2020, 06:44 PM
Replies: 5
Views: 421
Posted By PeteS in CA
Re: Replacing tantulum capacitors with electrolitic caps?

And if the Tokin ceramic caps are surface mount MLCCs their ESL is very low.
Forum: Troubleshooting Power Supplies and Power Supply Design 07-15-2020, 10:56 AM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

:gay: I think the second "+5V" column is for the -5V output. :gay: IMO, the chances the -12V and -5V outputs are capable of 1A are pretty low if they are regulated by a 78xx 3-T regulator.

The...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-15-2020, 10:46 AM
Replies: 43
Views: 1,920
Posted By PeteS in CA
Re: $20 "500W" PSU From MicroCenter, how bad can it be?

That thing needs a shrapnel warning! And if it arcs for a while after opening up, the PCB under it will be odoriferous toasty badness!
Forum: Troubleshooting Power Supplies and Power Supply Design 07-15-2020, 10:43 AM
Replies: 10
Views: 408
Posted By PeteS in CA
Re: OKI 590 Dot Matrix Printer w bad power supply.

The date code on the "C339" (LM339 clone) is late 1995. The Nichicon PL series is the pre-RoHS version of the current PM series and was introduced in the late 1980s, IIRC. Another clue to its age is...
Forum: General Electronics Technical Discussion 07-15-2020, 10:25 AM
Replies: 15
Views: 529
Posted By PeteS in CA
Re: Noob ohm low question

Many ICs draw little current unless powered with the proper voltage. Your ohm meter probably sources ~2V, which is way too low to cause active operation of a circuit that designed to be powered with...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-13-2020, 05:01 PM
Replies: 43
Views: 1,920
Posted By PeteS in CA
Re: $20 "500W" PSU From MicroCenter, how bad can it be?

:bow: to momaka for catching that really small output inductor core! An additional worrisome thing about it is that if enough power is drawn for the core temperature to get much above 90C or 100C,...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-10-2020, 06:44 PM
Replies: 1,661
Views: 367,592
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Does it become a night light if you draw more than 200W of power?
Forum: Troubleshooting Power Supplies and Power Supply Design 07-07-2020, 05:15 PM
Replies: 3,102
Views: 834,260
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Re the input lytics, your instincts are good, I think. 470uF will probably give decent hold-up time for 250W. The heatsinks might be good to 300W. OTOH, AWG #20 wire seems to me more appropriate for...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-07-2020, 05:00 PM
Replies: 43
Views: 1,920
Posted By PeteS in CA
Re: $20 "500W" PSU From MicroCenter, how bad can it be?

The heatsinks, 13007 BJTs, and main transformer look like ~200W, but those 220uF input lytics are more like 150W. I'm surprised it lasted long enough at 257W to get all the readings and w/f's without...
Showing results 1 to 25 of 500

 
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