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Search: Posts Made By: PeteS in CA
Forum: General Electronics Technical Discussion Today, 11:30 AM
Replies: 49
Views: 1,298
Posted By PeteS in CA
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

:poof:

:spank: :spank: :spank: :spank: :spank: :jester:
Forum: General Capacitor Questions & Issues Today, 11:13 AM
Replies: 4
Views: 94
Posted By PeteS in CA
Re: Decipher part of this please: 4.7U_0805_25V6K

There's no way a 0805 has terminals spaced far enough apart to handle 6KV without arcing. The "K" could be 10% tolerance. Or maybe "6K" could designate the tempco (though the terminology would be...
Forum: General Electronics Technical Discussion Yesterday, 12:14 PM
Replies: 3
Views: 79
Posted By PeteS in CA
Re: Help identify part JE9-3 relay and a repaceent.

The full part number seems to be JE9-3-24HST. I'm going to guess that "24" refers to the coil voltage. The brand seems to be Hongfa or Hong Fa.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-08-2021, 12:54 PM
Replies: 13
Views: 255
Posted By PeteS in CA
Re: Kolink Continuum KL-C1500PL can anyone identify this device BC729/8C729?

Or perhaps a SMT version of the 2SC729, an NPN transistor? Omitting the "2S" from transistor markings is common practice.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-08-2021, 12:47 PM
Replies: 8
Views: 269
Posted By PeteS in CA
Re: ADJ disco light PFC60-12 Power supply repair

That critter looks to be flyback topology. Other than a ferrite rod inductor to reduce spike noise it has no output inductor (the "transformer" is actually a coupled inductor, and the "output...
Forum: General Electronics Technical Discussion 10-08-2021, 12:35 PM
Replies: 49
Views: 1,298
Posted By PeteS in CA
Re: Has anyone had issues with Rayovac Alkaline batteries leaking

Had a bunch of leaking Duracells a couple of years ago, but not recently, touch wood.
Forum: General Capacitor Questions & Issues 10-05-2021, 05:54 PM
Replies: 14
Views: 746
Posted By PeteS in CA
Re: Question electrolytic capacitor from 1990`s

Only posting when sober sometimes works, too. :lolsign:
Forum: General Capacitor Questions & Issues 09-27-2021, 12:33 PM
Replies: 3
Views: 254
Posted By PeteS in CA
Re: replace nichicon HE series 2200mf 16v with vishay BC 136 SERIES 2200mf

Not familiar with Vishay caps, but here is the datasheet for Nichicon's HE series:

https://www.nichicon.co.jp/english/products/pdfs/e-he.pdf

And for Vishay's 136rvi series:
...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2021, 06:24 PM
Replies: 22
Views: 3,671
Posted By PeteS in CA
Re: Enermax PRO 82+ 525W repair

Inrush limiting thermistors are like fuses. They blow if something else draws excessive current.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-21-2021, 11:15 AM
Replies: 5
Views: 326
Posted By PeteS in CA
Re: Corsair CX750M [Model 75-002019] - burned output toroid inductor

Fair-Rite and Mag Inc. produce ferrite materials, and Mag Inc. produces molypermalloy powder and other specialty powdered-materials (as well as tape wound cores, a whole different aminal).
...
Forum: General Electronics Technical Discussion 09-21-2021, 10:59 AM
Replies: 3
Views: 249
Posted By PeteS in CA
Re: line powered filament LED lamps...

With traditional incandescent light bulbs, brightness is average voltage dependent. LED brightness is current dependent.

Hooking a simple series string of LEDs across the line would result in an...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-20-2021, 12:52 PM
Replies: 5
Views: 326
Posted By PeteS in CA
Re: Corsair CX750M [Model 75-002019] - burned output toroid inductor

Micrometals -26 material - powdered iron, 75 permeability, THE standard material long used in switching power supplies with switch frequencies under 50KHz (e.g. those using BJTs). Yellow body with a...
Forum: General Capacitor Questions & Issues 09-15-2021, 06:18 PM
Replies: 992
Views: 488,216
Posted By PeteS in CA
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-15-2021, 06:13 PM
Replies: 5
Views: 322
Posted By PeteS in CA
Re: Help with capacitor for graphics card

That circular thingy next to the "2" of "270" is the manufacturer's logo, which I don't recognize. The "5KR43" is probably the manufacturers date and/or factory code (probably both).

The part is...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-13-2021, 05:09 PM
Replies: 4
Views: 320
Posted By PeteS in CA
Re: Big Blue -- What is this component?

That one rectifier or ?? seems to have a chunk missing.

One of the rectifiers has "7912" marked on it. 12th week of 1979?

Dry tantalums sometimes catch fire or get really hot, burning PCBs and...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-10-2021, 12:33 PM
Replies: 24
Views: 841
Posted By PeteS in CA
Re: ATX PSU Tester Analyzer modification / upgrade

If it will work from 5VSB, you could always have diode-isolated "battery back-up":


https://n2.sdlcdn.com/imgs/g/i/9/Duracell-9-Volt-Alkaline-9-SDL833337425-2-de302.jpeg
Forum: General Capacitor Questions & Issues 09-10-2021, 12:24 PM
Replies: 60
Views: 14,154
Posted By PeteS in CA
Re: Any more info on counterfeit Nichicons?

The KZE series caps I tested in 2005 while at Curtis Instruments had green sleeves. Your memory of the time frame is correct. IIRC, KZE series parts I tested later (2005-2008 and part of January...
Forum: General Capacitor Questions & Issues 09-08-2021, 06:45 PM
Replies: 199
Views: 271,514
Posted By PeteS in CA
Re: The GOOD Capacitors Thread!!

My test results are not online, and are with my employer of that time, two jobs ago now. My test fixturer was designed by an engineer at the company, and I built most of the test fixtures I used. It...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-07-2021, 02:04 PM
Replies: 5
Views: 7,034
Posted By PeteS in CA
Re: iMac 27'' Blown Power Supply Repair

Sounds like the source of that primary auxiliary voltage is starting up and then shutting down. I'm not familiar with the specific power supply, but if it has a separate auxiliary regulator for the...
Forum: General Capacitor Questions & Issues 09-07-2021, 01:48 PM
Replies: 10
Views: 478
Posted By PeteS in CA
Re: Toshiba kitchen food processor (model: TFP 1500) Capacitor value ?

I don't know if the company still makes the part, but I'm pretty sure the original part was made by Wima, https://www.wima.de/en/ .
Forum: General Capacitor Questions & Issues 09-07-2021, 01:43 PM
Replies: 6
Views: 473
Posted By PeteS in CA
Re: Help identifying an old capacitor

The manufacturer of those parts was Ceramite, a spin-off from Sprague. The series is 30LV. More to the point, Ceramite was bought by Vishay, https://www.vishay.com/docs/23084/ceramite.pdf . They are...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-18-2021, 04:32 PM
Replies: 6
Views: 412
Posted By PeteS in CA
Re: Morex Int'l ATX-300C, worth a recap?

Looks like a fairly ordinary half bridge design, possibly with BJTs instead of MOSFETs. The core material for the output inductor is best for switch frequencies under 50KHz. The size of the...
Forum: General Capacitor Questions & Issues 08-12-2021, 12:43 PM
Replies: 53
Views: 9,920
Posted By PeteS in CA
Re: Würth Elektronik Electrolytic Capacitors Official Thread

Back in ca. 2006 I torture-tested some Jianghai. At the time Evox-Rifa was distributing them. Compared to the several ______con and Panasonic series that did well, the Jianghai were junk, in the same...
Forum: General Capacitor Questions & Issues 08-11-2021, 10:38 AM
Replies: 199
Views: 271,514
Posted By PeteS in CA
Re: The GOOD Capacitors Thread!!

Lelon low impedance caps did poorly in my torture tests back in 2005 or 2006. As did UCC KZG and KZJ a year or two later, much to my surprise at the time. UCC LXV, LXZ, KZE, and KY did well; Rubycon...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-09-2021, 12:29 PM
Replies: 6
Views: 591
Posted By PeteS in CA
Re: NCP1271 power supply not working under load

If the actual circuit is similar to the sample circuit on the datasheet, one possibility is that the current sense resistor in the MOSFET Source circuit has increased in value and loading the power...
Showing results 1 to 25 of 500

 
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