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Search: Posts Made By: PeteS in CA
Forum: General Capacitor Questions & Issues 11-24-2021, 06:02 PM
Replies: 4
Views: 167
Posted By PeteS in CA
Re: NCC KMS Reference

Based on the picture below, that could be a genuine part.


https://media.rs-online.com/t_large/R9143787-01.jpg
Forum: Troubleshooting Power Supplies and Power Supply Design 11-23-2021, 12:55 PM
Replies: 3,147
Views: 979,600
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

The current rating for the +5SB is just .1A, some the effect on efficiency is minimal. A 50/60 Hz transformer, recifiers, and 7805 3T regulator might have been cheaper than a flyback switching...
Forum: General Capacitor Questions & Issues 11-22-2021, 05:13 PM
Replies: 8
Views: 572
Posted By PeteS in CA
Re: Cap Identification

Those Wima 2.5 mm lead space caps definitely have a 1980s vibe. I'll guess the coating may be Humiseal, a coating used to seal out moisture.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-15-2021, 12:38 PM
Replies: 34
Views: 5,547
Posted By PeteS in CA
Re: Corsair CX400W 5vsb goes into safety loop

Actually, NCC KY series are low impedance, high ripple current parts, probably a good choice. As for the Rubycon MCZ, that might be "too good", and it might not be great in a P/S. If I recall...
Forum: General Capacitor Questions & Issues 11-15-2021, 12:24 PM
Replies: 2
Views: 195
Posted By PeteS in CA
Re: help to find Nippon Chemi-Con datasheet

Datasheets for general purpose part often or usually do not give the ripple current or impedance rating. General purpose parts are not intended for high ripple current or low impedance usage.
Forum: General Capacitor Questions & Issues 11-15-2021, 12:18 PM
Replies: 4
Views: 158
Posted By PeteS in CA
Re: Help to choose caps with different ripple current

The NCC KMG series looks to be a high quality 105C general purpose part (and no longer in VCC's catalog?). The Rubycon ZLH series is a very low impedance, long life part. Very different parts for...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-08-2021, 12:15 PM
Replies: 4
Views: 483
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Power Good (the grey wire) is a signal, not an output voltage. If all the output voltages from the power supply are in regulation, the Power Good should be logic high, 5V. If all output voltages are...
Forum: General Capacitor Questions & Issues 11-08-2021, 12:02 PM
Replies: 21
Views: 1,811
Posted By PeteS in CA
Re: Question electrolytic capacitor from 1990`s

You might find the initial post in this thread helpful, https://www.badcaps.net/forum/showthread.php?t=50530 .
Forum: General Capacitor Questions & Issues 11-04-2021, 11:21 AM
Replies: 2
Views: 186
Posted By PeteS in CA
Re: GPU Caps Out of Spec?

Polymer caps don't have a liquid electrolyte that can evaporate over time. BTW, the dielectric in an electrolytic or polymer cap is not the electrolyte or the polymer. The dielectric is a layer of...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-03-2021, 12:33 PM
Replies: 60
Views: 26,457
Posted By PeteS in CA
Re: Bestec ATX-250 12Z problems and solutions

1. You probably could, hypothetically, change the feedback divider resistors, making at least one a potentiometer, to get an adjustment range of 2V-6V. However ...

2. The supervisor circuit, if...
Forum: General Capacitor Questions & Issues 11-01-2021, 11:04 AM
Replies: 2
Views: 213
Posted By PeteS in CA
Re: Is it ok to use a capacitor with a much higher ripple?

Replacing a GP cap with a low impedance, high ripple current rating cap is usually OK. Unless it was a GP cap in a circuit needing low impedance, etc., the original part would not have been a misuse.
Forum: General Electronics Technical Discussion 10-21-2021, 03:20 PM
Replies: 7
Views: 360
Posted By PeteS in CA
Re: AC / DC ADAPTER upgrade?

There would be potential issues from the output terminals of the AC inlet to the wires to the output plug:

Input rectifier current rating

Switch MOSFET or IC

Current sense resister in the...
Forum: General Capacitor Questions & Issues 10-20-2021, 01:08 PM
Replies: 3
Views: 267
Posted By PeteS in CA
Re: ceramic

The suitability question may be more than what DC voltage the part can withstand. Depending on the type of ceramic dielectric, specifically its temperature and voltage coefficients, the applied DC...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-19-2021, 12:28 PM
Replies: 16
Views: 5,490
Posted By PeteS in CA
Re: Repairing Bestec TFX0250D5W

You might want to look at the inrush limiter thermistor, the green disc next to the fuse. It looks like it is chipped, and it might be cracked.

BTW, that power supply is almost 11 years old, very...
Forum: General Capacitor Questions & Issues 10-19-2021, 12:17 PM
Replies: 3
Views: 266
Posted By PeteS in CA
Re: Question about capacitor size with same rating

If by "rating" you mean capacitance and voltage, it often does matter, because the temperature, impedance, and ripple current rating often matter a lot.

On the other hand, if you are comparing a...
Forum: General Capacitor Questions & Issues 10-19-2021, 12:09 PM
Replies: 8
Views: 437
Posted By PeteS in CA
Re: Exactly same capacitors from NCC and Nichicon

Nippon Chemicon and Nichicon manufacture their own parts. They do not rebrand.

Nippon Chemicon (NCC) and Nichicon - and others - sell similar parts that compete with each other directly. See, for...
Forum: General Capacitor Questions & Issues 10-17-2021, 10:57 AM
Replies: 8
Views: 437
Posted By PeteS in CA
Re: Exactly same capacitors from NCC and Nichicon

They’re equivalent series - same specs, but competitors, not identical factory. NCC/UCC and Nichicon are manufacturers, not rebranded.
Forum: General Capacitor Questions & Issues 10-17-2021, 10:54 AM
Replies: 8
Views: 445
Posted By PeteS in CA
Re: Do bad capacitors stink?

I’ve had caps new in the sealed bag smell like rotting fish. They were samples I was supposed to evaluate, but the stench made that unnecessary.
Forum: General Electronics Technical Discussion 10-15-2021, 11:30 AM
Replies: 91
Views: 4,579
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 10-15-2021, 11:13 AM
Replies: 7
Views: 416
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 10-14-2021, 12:14 PM
Replies: 3
Views: 263
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: 490
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: 10
Views: 616
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: 91
Views: 4,579
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: 21
Views: 1,811
Posted By PeteS in CA
Re: Question electrolytic capacitor from 1990`s

Only posting when sober sometimes works, too. :lolsign:
Showing results 1 to 25 of 500

 
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