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Search: Posts Made By: PeteS in CA
Forum: Troubleshooting Power Supplies and Power Supply Design 08-05-2020, 03:35 PM
Replies: 1,643
Views: 360,967
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: 1,643
Views: 360,967
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: 9,471
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: 223
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: 1,643
Views: 360,967
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: 1,455
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: 267
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: 353
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: 1,455
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: 1,643
Views: 360,967
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: 823,404
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: 1,455
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...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-30-2020, 04:36 PM
Replies: 3,102
Views: 823,404
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

The heatsinks and TO-3P 13009s make 300W-350W seem credible. But the 470uF input lytics and outputs inductor are more realistic for 250W, and that main transformer maybe more like 200W. At least you...
Forum: General Capacitor Questions & Issues 06-29-2020, 06:56 PM
Replies: 15
Views: 9,471
Posted By PeteS in CA
Re: What can you tell me about Epcos caps?

Two different vent styles?
Forum: Troubleshooting Power Supplies and Power Supply Design 06-24-2020, 04:42 PM
Replies: 12
Views: 318
Posted By PeteS in CA
Re: How to make a constant current DC power supply?

Assuming you would use a transformer to step down the voltage and to provide isolation (safety) there's a circuit that might be useful in the application notes for the LM317 adjustable positive...
Forum: General Capacitor Questions & Issues 06-24-2020, 04:36 PM
Replies: 6
Views: 552
Posted By PeteS in CA
Re: Advice on replacing some mid80's caps

Nichicon's PM series (lead-free version of the PL series) and PJ series are fairly old, as is the PS series (lead-free version of the PR series). Nichicon is pretty accommodating of customers using...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-22-2020, 04:47 PM
Replies: 20
Views: 679
Posted By PeteS in CA
Re: Dead ATX power supply, please help.

The picture in the OP suggests that the inductor is a differential mode inductor, possibly wound on Micrometals -52 material. If that is correct (there is RTV that partly blocks the view) and if the...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-15-2020, 03:25 PM
Replies: 1,643
Views: 360,967
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

I'm going to concur with momaka, the big lytics probably failed when one of the rectifiers in the bridge shorted and the caps saw reverse voltage. While the label value of 470uF in that configuration...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-08-2020, 03:33 PM
Replies: 1,643
Views: 360,967
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Yeah, that Lametech looks like it could be a usable 200W P/S - limited by the 330uF F-yus, where's-the-beef heatsinks, under-sized main transformer, wimpy output rectifiers, almost-tiny toroids and...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-14-2020, 05:58 PM
Replies: 1,643
Views: 360,967
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Might do 200-250W, but if those "Y caps" are generic 1KV or 2KV DC parts instead of agency-approved safety caps, :gay: .
Forum: General Electronics Technical Discussion 05-14-2020, 05:48 PM
Replies: 7
Views: 310
Posted By PeteS in CA
Re: Anyone recognize this power supply?

I think I saw a 1989 date code on that silver-colored 85C 1000uF made by El Cap.
Forum: General Capacitor Questions & Issues 05-01-2020, 04:56 PM
Replies: 8
Views: 544
Posted By PeteS in CA
Re: Need help with determining what this component is?

The thermistor vendor is Uppermost Electronic Industries. Inrush thermistors are sort of like fuses in the sense that they don't blow like that on their own. There must have been a short circuit...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-29-2020, 04:46 PM
Replies: 10
Views: 328
Posted By PeteS in CA
Re: Help with a non PC PSU

That MOV plus the many damaged appliances in your area mean that the area had a significant electrical surge, either just before power went out, or right after it was restored. The fuse is between...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-24-2020, 03:21 PM
Replies: 3,102
Views: 823,404
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Interesting that the multi-output output inductor is mounted on a base. That might improve its stability under vibration.
Forum: Troubleshooting Power Supplies and Power Supply Design 03-03-2020, 01:59 PM
Replies: 3,102
Views: 823,404
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

I see that Delta P/S was made in late 2008. So 8-11 years of life would be pretty decent. But 4 or 5 would not, unless the customer kept the computer in a confined space with poor cooling.
Showing results 1 to 25 of 500

 
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