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Search: Posts Made By: TheLaw
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 12-17-2021, 10:50 AM
Replies: 3
Views: 485
Posted By TheLaw
Re: Burned ferrite bead RTX 2080 LB617

They are ferrite beads. They are labeled LB617 and LB618.

Hard to say if they are the cause of the artifcating. Remove them, clean up the boards, check if traces are damaged. You can start by...
Forum: General Capacitor Questions & Issues 12-17-2021, 10:10 AM
Replies: 6
Views: 1,281
Posted By TheLaw
Re: Is there a manufacturers tolerance for ripple?

No. A capacitor's ability to smooth out voltage ripple is related to its capacitance and ESR. Whether a given capacitor can "smooth out voltage ripple" is totally dependent on the requirements of the...
Forum: General Capacitor Questions & Issues 12-16-2021, 10:35 PM
Replies: 6
Views: 1,281
Posted By TheLaw
Re: Is there a manufacturers tolerance for ripple?

The ripple current rating is generally used as a point of guidance in selecting a capacitor. It's not a hard limit, unlike the voltage rating, for instance.

Each switch-mode topology has a set of...
Forum: General Capacitor Questions & Issues 12-16-2021, 04:02 PM
Replies: 13
Views: 1,297
Posted By TheLaw
Re: Replacing low value electrolytics with ceramic?

If you want to visualize how capacitance drops with applied DC bias voltage, you can check out Kemet's KSIM web app:

https://ksim3.kemet.com/capacitor-simulation

The limitation is fundamentally...
Forum: General Capacitor Questions & Issues 12-06-2021, 10:59 AM
Replies: 34
Views: 5,405
Posted By TheLaw
Re: Modern Samxon and Teapo caps much better these days?

I don't know for sure. I think Chinese companies have gotten a big enough credibility boost over the last decade that they do have some reputation to protect and uphold.

Samxon has reported to our...
Forum: General Electronics Technical Discussion 02-17-2021, 02:14 PM
Replies: 61
Views: 4,996
Posted By TheLaw
Re: Oscilliscopes

https://www.tequipment.net/Instek/GDS-1054B/Digital-Oscilloscopes/

The 50MHz 4-channel verison is selling for <$350USD. I'm aware of how cheap the Rigol is, and while it was absolutely amazing 5-6...
Forum: General Electronics Technical Discussion 02-15-2021, 11:56 AM
Replies: 61
Views: 4,996
Posted By TheLaw
Re: Oscilliscopes

I like GWInstek GDS-1054B. I find the user interface waaaay better than Rigol, and on-par with Siglent. We have a GDS-1054B at work. It's pleasant to use.

At home I have a GDS-2104E, which I...
Forum: General Capacitor Questions & Issues 12-16-2020, 02:13 PM
Replies: 34
Views: 5,405
Posted By TheLaw
Re: Modern Samxon and Teapo caps much better these days?

Good point. I'm pretty confident I've seen bags from Mouser from Nichicon with Malaysia country of origin. Same for Nippon Chemi-con. I haven't seen a made in Japan Panasonic in about 10 years.
...
Forum: General Capacitor Questions & Issues 12-16-2020, 10:57 AM
Replies: 34
Views: 5,405
Posted By TheLaw
Re: Modern Samxon and Teapo caps much better these days?

I haven't been on this forum in years, but, now that I work in power adapter design, with a factory (wholly owned by the company) in China, here's my input:

Samxon, Aishi, Teapo, and Jianghai are...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-28-2011, 03:28 PM
Replies: 105
Views: 24,554
Posted By TheLaw
Re: Oscilloscope

I just snagged a 100Mhz Tek 465M for $70 shipped off eBay.

It's sweet.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-21-2011, 02:52 PM
Replies: 29
Views: 11,666
Posted By TheLaw
Re: What an analog ESR meter will and won't do

I got interested in making one again. Can you explain what you mean by transformers and lowering their series resistance etc?

Thanks.
Forum: General Capacitor Questions & Issues 09-22-2011, 04:45 PM
Replies: 32
Views: 8,405
Posted By TheLaw
Forum: General Capacitor Questions & Issues 09-21-2011, 07:27 PM
Replies: 2
Views: 3,720
Posted By TheLaw
Re: Did i buy a bad capacitor (TAICON) ?

If the capacitor has exploded, yes that is almost 100% the problem. Taicon isn't the worst, but there are much better replacements. A low ESR cap from Nichicon, Nippon-chemicon, Panasonic, Rubycon,...
Forum: General Capacitor Questions & Issues 09-21-2011, 04:42 PM
Replies: 32
Views: 8,405
Posted By TheLaw
Re: These are Sacon FZs right? *sigh*

Finally did the recap.

Went with 6x 1000uF 6.3v Nichicon/FPCAP, 1x Chemicon 100uf 10V PS.
Forum: General Capacitor Questions & Issues 09-17-2011, 04:31 PM
Replies: 16
Views: 5,234
Posted By TheLaw
Re: The most stressed capacitor in PSU

Typically the caps that do the filtering after the switchers because those have quite a bit of ripple and noise due to the nature of switchers. The high voltage caps don't usually see too much abuse....
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-17-2011, 09:45 AM
Replies: 11
Views: 7,210
Posted By TheLaw
Re: I need a new multimeter but don't want to spend a fortune.

I dunno. They look pretty high quality to me...I don't know about those surface mount pots...but otherwise looks good.

Regardless, it's your choice. An Amprobe or Extech are pretty good values...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-17-2011, 09:43 AM
Replies: 11
Views: 7,210
Posted By TheLaw
Re: I need a new multimeter but don't want to spend a fortune.

Not a bad choice for $35. Something happened to your pictures...Maybe you can reupload them?
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-15-2011, 07:05 PM
Replies: 11
Views: 7,210
Posted By TheLaw
Re: I need a new multimeter but don't want to spend a fortune.

Fluke 17B- $80

It's a "China-only" genuine Fluke. Honestly, after looking at many reviews, there is really nothing but good things about this meter. Excellent quality construction. Just as good as...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-15-2011, 04:37 PM
Replies: 29
Views: 11,666
Posted By TheLaw
Re: What an analog ESR meter will and won't do

Ahh. Is it possible you make a small write-up? Maybe some pics? I'm not sure if anyone else is following this thread, but this would be one of the only analog ESR meters that might be capable of...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-14-2011, 07:20 PM
Replies: 29
Views: 11,666
Posted By TheLaw
Re: What an analog ESR meter will and won't do

Eventually I may want to try to make one of these cheap analog ESR meters...What modifications did you make (exactly) to achieve the range you got on yours?

Thanks.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-28-2011, 12:03 AM
Replies: 26
Views: 17,167
Posted By TheLaw
Re: The Power Supply Modding Guide (or TL494 -> Anything)

Unique you're a boss. Thanks for sharing all of this.

Your theme-song: http://www.youtube.com/watch?v=nW4Acfqzpz4
Forum: General Capacitor Questions & Issues 08-27-2011, 11:54 PM
Replies: 29
Views: 9,304
Posted By TheLaw
Re: i7 920 SMD capacitors/resistors

14uF is possible in smaller SMD ceramic, but I kind of doubt it.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-17-2011, 08:22 AM
Replies: 21
Views: 7,098
Posted By TheLaw
Re: How can PC PSUs use such small transformers and have a BIG output?

Really? Well that was new news to me. Thanks.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-16-2011, 05:35 PM
Replies: 13
Views: 5,062
Posted By TheLaw
Re: External 5.25 enclosure PSU

No, I believe that's a snap in. You just don't realize it. Snap in is a radial lead, just it usually has the leads pre-cut and angled so that they kind of snap through the board. Maybe you knew that....
Forum: Troubleshooting Power Supplies and Power Supply Design 08-16-2011, 05:16 PM
Replies: 21
Views: 7,098
Posted By TheLaw
Re: How can PC PSUs use such small transformers and have a BIG output?

Yeah thanks.

One more question.

Switching regulators are apparently more "efficient", as they put out less heat and the power wasted isn't dependent on the difference between input and output...
Showing results 1 to 25 of 444

 
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