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Search: Posts Made By: PeteS in CA
Forum: General Capacitor Questions & Issues Yesterday, 03:33 PM
Replies: 6
Views: 208
Posted By PeteS in CA
Re: Nippon Chemi-Con 3300uF 10x25mm?

As has abyse, I've seen KZE in modern higher end PSUs. Rubycon ZL as well.
Forum: General Electronics Technical Discussion 06-04-2019, 05:37 PM
Replies: 11
Views: 196
Posted By PeteS in CA
Re: SMPS mains input voltage question

The 220V cap limits it to 110/120 VAC. When rectified the DC voltage will be in the 160V range. Double the input voltage, double the output voltage. If designed properly, the MOV should also be...
Forum: General Capacitor Questions & Issues 06-04-2019, 05:26 PM
Replies: 5
Views: 170
Posted By PeteS in CA
Re: What do these motherboard caps do?

Your MB has DC-DC converters on it to regulate the proper voltage for your processor and memory. Those are probably the output filter capacitors for that DC-DC converters. They need to be ultra-low...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-03-2019, 12:39 PM
Replies: 1,560
Views: 317,560
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

ae7oo, if the TL494 clone PWM is on the secondary side then no feedback optocoupler or feedback transformer is needed. The pulse width modulation is done by the PWM IC, which drives the switch...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-29-2019, 12:24 PM
Replies: 10
Views: 587
Posted By PeteS in CA
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller

470 pF, 10%, 1 KV. The "K" means 10% tolerance; "M" would have meant 20% and "J" would have meant 5%.
Forum: General Capacitor Questions & Issues 05-22-2019, 11:55 AM
Replies: 13
Views: 306
Posted By PeteS in CA
Re: Macintosh polymer recap & ESR considerations

I picked a random value/voltage to compare the various series, not for any other reason. Since I'm not being understood I'll drop out of the conversation rather than cause further confusion.
Forum: General Capacitor Questions & Issues 05-20-2019, 01:09 PM
Replies: 13
Views: 306
Posted By PeteS in CA
Re: Macintosh polymer recap & ESR considerations

Looks like my memory was largely incorrect regarding the PM, PJ, and PW series:

PS Series, 2200uF, 6.3V, 12.5x20, .075 ohm impedance, 1250 mA ripple current

PM Series, 2200uF, 6.3V, 10x31.5,...
Forum: General Capacitor Questions & Issues 05-17-2019, 12:13 PM
Replies: 13
Views: 306
Posted By PeteS in CA
Re: Macintosh polymer recap & ESR considerations

The power supply in your pictures appears to have bee built in 1988, based on the date code marked on the Fujitsu MB3579, which looks like a PWM similar to (or a clone of) a TL494.

That was right...
Forum: General Capacitor Questions & Issues 05-16-2019, 02:13 PM
Replies: 13
Views: 306
Posted By PeteS in CA
Re: Macintosh polymer recap & ESR considerations

Sprague's bits and pieces got bought by multiple companies. Nippon Chemi-Con bought some of Sprague, too.

That said, Sprague 672D series was equivalent to NCC's RX series and, I think, Nichicon's...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-15-2019, 11:14 AM
Replies: 1,560
Views: 317,560
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

The generic-junk "Y" caps were pretty obvious to me too. What are they, 1000pF or 470pF?

There's no way in Hades that thing could ever sustain 350W for more than milliseconds. That said, the...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-06-2019, 02:02 PM
Replies: 3,036
Views: 747,864
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Going by date codes on parts, that was built in July or August of 2003. All that :rock: heavy metal :rock: probably helped with its longevity.

That Fairchild ML4800 was one of the very first PFC...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-29-2019, 06:51 PM
Replies: 3,036
Views: 747,864
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

I think I saw a late 2004 date code (043#), so it's nearly 15 years old. The 2A 5VSB is a little low for that era, perhaps. OTOH, the 12V current is pretty hefty. Love the heavy metal :rock: , and a...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-29-2019, 06:35 PM
Replies: 5
Views: 221
Posted By PeteS in CA
Re: What are typical problems with this kind of psu behaviour?

Hmmm, OVP shut down and restart? The low cold resistance of the halogen bulb is tripping over-current protection?

Some of the solder joints near the board edge nearer the camera, roughly in the...
Forum: General Capacitor Questions & Issues 04-26-2019, 01:49 PM
Replies: 948
Views: 399,173
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

It's weird to think that my time as the Torquemada of Capacitors was that many years and two employers ago. It was fun, but the commute was ~75 miles a day, :barf: .
Forum: General Capacitor Questions & Issues 04-25-2019, 01:51 PM
Replies: 9
Views: 3,161
Posted By PeteS in CA
Re: Wurth capacitors

A bit over 10 years ago Evox-Rifa explored selling some Chinese-made electrolytic caps, and gave my then-current employer a bunch of samples for us to test. IIRC, the box smelled like rotting fish...
Forum: Troubleshooting Power Supplies and Power Supply Design 04-23-2019, 12:14 PM
Replies: 3,036
Views: 747,864
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

The UC3845B is a current-mode PWM IC. The WT7502A is a supervisor IC.
Forum: Troubleshooting Power Supplies and Power Supply Design 04-17-2019, 12:18 PM
Replies: 13
Views: 260
Posted By PeteS in CA
Re: ASUS 90W Charger

Concur that it could be a bad solder joint. But as mariushm pointed out, there could be a problem farther on in the circuit that drew excessive current.
Forum: General Electronics Technical Discussion 04-12-2019, 11:47 AM
Replies: 73
Views: 756
Posted By PeteS in CA
Re: Help Identify Capacitor

Yeah, they were kind of a grab bag kind of thing. This was somewhere around 1970, when our school cafeteria was serving the last of the frozen dinoburgers.
Forum: General Electronics Technical Discussion 04-11-2019, 02:01 PM
Replies: 22
Views: 367
Posted By PeteS in CA
Re: Using Kynar 30AWG for 120VAC

I sure do not love the soldering on the power cord wires (IIRC, White = Neutral is US usage).
Forum: General Electronics Technical Discussion 04-11-2019, 01:55 PM
Replies: 73
Views: 756
Posted By PeteS in CA
Re: Help Identify Capacitor

As did Mouser. Back in really ancient times there was Poly-Paks, who I think bought up floor sweepings and reject bins. Long, long ago in a desert far, far away, Honeywell Phoenix had a warehouse...
Forum: General Capacitor Questions & Issues 04-01-2019, 12:45 PM
Replies: 7
Views: 236
Posted By PeteS in CA
Re: 1960s-1982 smelly caps - polychlorinated biphenyls?

From the NCC webpage linked above:



Oil, including those containing PCBs is an insulator, used as a dielectric.

In electrolytic capacitors, the electrolyte is a conductor. The dielectric is...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-27-2019, 12:07 PM
Replies: 18
Views: 471
Posted By PeteS in CA
Re: YLP-013 450W capacitor value.

Judging from the second picture in post #3 of this thread, it looks like the PSU has generic 1KV (DC) caps where safety agency rated Y caps (250VAC or higher, with special construction) should be...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-25-2019, 05:47 PM
Replies: 3,036
Views: 747,864
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Beautiful ... power supply porn!
Forum: Troubleshooting Power Supplies and Power Supply Design 03-20-2019, 11:22 AM
Replies: 25
Views: 541
Posted By PeteS in CA
Re: Apple ][+ Astec power supply

I don't think they were fixed frequency. That said, they were normally above 20KHz, so they would not be audible, and bipolar transistors limited the practical maximum switch frequency to around...
Forum: Troubleshooting Power Supplies and Power Supply Design 03-19-2019, 12:50 PM
Replies: 25
Views: 541
Posted By PeteS in CA
Re: Apple ][+ Astec power supply

The main difference I've seen between a TO-3 and a TO-204 is that the former has a rounded top on the dome/cap. They were/are good for heat dissipation and better at mounting flush to a surface than...
Showing results 1 to 25 of 500

 
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