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Search: Posts Made By: mariushm
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 09-19-2018, 01:15 AM
Replies: 2
Views: 43
Posted By mariushm
Re: Lets talk About Mosfet...

Is it that hard to compare the specifications in the datasheet?

AO mosfet seems to require higher gate threshold voltage (Vgs) ... which may or may not matter depending on how it's used in...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-17-2018, 01:14 PM
Replies: 18
Views: 268
Posted By mariushm
Re: Need help with LED Power Supply Design

(i have a horrible keyboard as my preferred one just died recently and new one didn't arrive yet , until i replace it i may miss some letters or not use uppercase, the keys are truly awful, sometimes...
Forum: General Capacitor Questions & Issues 09-16-2018, 06:42 AM
Replies: 36
Views: 784
Posted By mariushm
Re: Polymodding Asus A7V266-E, Capacitor Recommendations?

Be careful with the polarity of capacitors.
Typically on motherboads you have a drawing, a round circle with part of it filled - that part normally represents the negative side.

However, Asus...
Forum: Troubleshooting TVs and Video Sources 09-13-2018, 02:31 PM
Replies: 32
Views: 397
Posted By mariushm
Re: Simulating load on LED drivers.

The tv will probably also have a circuit to detect how much current goes through the chain of leds at a certain brightness level ... to detect if some leds in the chain are shorted or something like...
Forum: General Capacitor Questions & Issues 09-11-2018, 04:00 PM
Replies: 6
Views: 126
Posted By mariushm
Re: Small cap replacements for Sony CRT

Buy 63v or higher voltage rating capacitors, you don't have to stick to 50v

Just check for 63v rated capacitors on Digikey, and all your values can be found on Digikey.

I would be reluctant...
Forum: General Capacitor Questions & Issues 09-08-2018, 04:24 PM
Replies: 16
Views: 610
Posted By mariushm
Re: Clarification of values?

If the capacitor is used in a switching power supply or somewhere high frequency is involved, ESR will pretty much be equal to impedance (the differences are so small they can be ignored), so you can...
Forum: Troubleshooting Printers, Copiers, Scanners and other Imaging & Printing Devices 09-08-2018, 08:20 AM
Replies: 17
Views: 4,021
Posted By mariushm
Re: Cap. plague in Minolta DiMAGE Scan Elite 5400?

aic1563 is a dc-dc converter chip, see http://www.analog.com.tw/ImgShow/DS-1563G-01.pdf
check example circuits in datasheet and compare your parts with circuit.i have hunch it may be input capacitor...
Forum: General Electronics Technical Discussion 09-05-2018, 03:41 PM
Replies: 29
Views: 279
Posted By mariushm
Re: Center Pin Polarity Check?

Grab a multimeter. Put it in continuity mode. Put one probe on the negative in the battery compartment and touch the outside of the barrel connector with your other probe. if there's continuity, you...
Forum: General Electronics Technical Discussion 09-05-2018, 02:51 PM
Replies: 29
Views: 279
Posted By mariushm
Re: Center Pin Polarity Check?

The polarity is usually printed on the label or engraved in the plastic near the dc jack

you should see a logo similar to this near the connector:
...
Forum: General Electronics Technical Discussion 09-03-2018, 06:08 PM
Replies: 4
Views: 164
Posted By mariushm
Re: closest match for Nichicon HZ 6.3v 2200 uF

I'd just replace it with a polymer capacitor. Depending on the location, probably any ultra low esr 1800uF or higher polymer capacitor would do.
As you say it's working now, measure the voltage...
Forum: General Capacitor Questions & Issues 09-01-2018, 06:00 PM
Replies: 39
Views: 1,659
Posted By mariushm
Re: Swapping japanese/generic electrolythics with solid-states

@Snayperskaya

If you look on your motherboard, you will see that he DC-DC converter (the VRM) that converts your 12v into the voltage your cpu is made out of a few almost identical "modules",...
Forum: General Capacitor Questions & Issues 09-01-2018, 01:34 PM
Replies: 39
Views: 1,659
Posted By mariushm
Re: Swapping japanese/generic electrolythics with solid-states

FL series is one of those "custom" / "on special order" / "on big customer request" series, and it's probably just a tweaked series to make the capacitors smaller diameter and taller (more suitable...
Forum: General Capacitor Questions & Issues 08-31-2018, 05:42 PM
Replies: 39
Views: 1,659
Posted By mariushm
Re: Swapping japanese/generic electrolythics with solid-states

i wouldn't replace them.
the capacitors by back panel and agp and pci slots and bottom usb headers , they're all for filtering 5 rail locally, they just reused KZG series probably because they...
Forum: All Others Motherboards 08-23-2018, 01:36 PM
Replies: 28
Views: 1,790
Posted By mariushm
Re: Unknown Motherboard Recapping

i don't agree with that statement...

While yes, the FL series of capacitors from Panasonic may be better in specifications compared to FM or FR, it's not really that far off.

That OEM...
Forum: All Others Motherboards 08-23-2018, 09:38 AM
Replies: 28
Views: 1,790
Posted By mariushm
Re: Unknown Motherboard Recapping

Indeed, you can use much lower capacitance than what's already on the motherboard, if you go with polymer capacitors.
They had to go with 1800uF 6.3v or whatever is there, because those capacitors...
Forum: General Electronics Technical Discussion 08-06-2018, 07:41 AM
Replies: 13
Views: 591
Posted By mariushm
Re: How do I calculate the amp hour for a device to run on battery power

It's a bit more tricky... your led uses 360mA but what voltage? because the light could have one led and pump 360mA through it, or the lamp could have 3-5 leds in series so still 360mA but you have...
Forum: General Electronics Technical Discussion 07-29-2018, 09:41 AM
Replies: 25
Views: 564
Posted By mariushm
Re: Wireless recording device

Even cheap microcontrollers have 10 bit ADCs so in theory you can have 8 bit audio without any problems. So you could record mono 8 bit 22050 Hz audio for example onto a SD card.

Some...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-23-2018, 04:16 AM
Replies: 2
Views: 73
Posted By mariushm
Re: Download 633 files BIOS

I made a copy of those on my ftp server, here:


ftp://helpedia.com/pub/temp/uploads/eloy/


There's a lot more bios files and service manuals and stuff there, just go up a folder or two.
Forum: General Computer Discussion 06-24-2018, 12:06 PM
Replies: 71
Views: 2,635
Posted By mariushm
Re: Hard drive reliability

The Seagate 2 TB drive died on me maybe 2-3 months ago... i expected it to die before my WD drive, still sad I didn't manage to backup some of the movies i had on it (nothing i can't download again...
Forum: General Electronics Technical Discussion 06-24-2018, 11:58 AM
Replies: 8
Views: 205
Posted By mariushm
Re: please help identify this component

One of the lines may be the month and year of manufacturing, or batch number, it's unlikely you'll find a picture with exactly the same writing, with all rows of text the same.

With all the...
Forum: General Capacitor Questions & Issues 06-20-2018, 01:30 AM
Replies: 8
Views: 409
Posted By mariushm
Re: Bad or just glue?

Yes, remove that black gunk first, try gently scraping it off with a screwdriver tip , use some cottow swabs dabbed in isopropyl alcohol if needed.

That gunk goes brown / black with time and...
Forum: Troubleshooting TVs and Video Sources 04-26-2018, 07:55 AM
Replies: 20
Views: 642
Posted By mariushm
Re: 150uf at 450 wv Large Capacitor Blown - I've Never Seen This... Have you?

It can happen... lightning strikes, power phases being shorted in such a way that you'd get 300v+ in the device, active pfc circuits breaking and sending high voltage in those caps...
Forum: General Electronics Technical Discussion 04-22-2018, 02:47 PM
Replies: 11
Views: 302
Posted By mariushm
Re: I want to build a LED flood light board use 3.3 volts or 5 volts (White color LE

Your Digikey link in reply to my previous post doesn't work, so I'm not sure what product you're referring to.

-

My advice would be to stop thinking about how to power your leds with 5v or...
Forum: General Electronics Technical Discussion 04-22-2018, 09:44 AM
Replies: 11
Views: 302
Posted By mariushm
Re: I want to build a LED flood light board use 3.3 volts or 5 volts (White color LE

5v leds? those are probably led strips, which would come with resistors for every led or for every r,g,b of the led or the current limiting is built in if you're talking about programmable RGB leds...
Forum: General Computer Discussion 04-20-2018, 04:31 PM
Replies: 256
Views: 6,166
Posted By mariushm
Re: Some serious security bug in INTEL CPUs?? Since Westmere possibly

They're working on Ryzen mobile, but it's a niche (along with servers) where Intel pumps a lot of marketing money and they won't give that up easily. It's more difficult than desktop and HEDT...
Showing results 1 to 25 of 500

 
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