Re: Nichicon/FPCAP?
"electrolytic" doesn't necessarily imply that it's a wet capacitor. [URL="http://www.edc.sanyo.com/english/pdf/oscon/E56.pdf"]Here's a diagram[/URL] from Sanyo that explains the terminology.
There were caps that had wet organic polymer electrolyte like 10 years ago, but that's gone by the wayside.Re: Nichicon/FPCAP?
"electrolytic" doesn't necessarily imply that it's a wet capacitor. [URL="http://www.edc.sanyo.com/english/pdf/oscon/E56.pdf"]Here's a diagram[/URL] from Sanyo that explains the
Slakky
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Last Activity: 01-08-2021, 01:27 AM
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Re: Nichicon/FPCAP?
The old ones with vents were the wet polymer variety similar to OS-CONs, but they haven't made those in a while. The new ones are all solid like everyone else.Leave a comment:
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Re: Losing date & time.
Bad PRAM battery most likely. Either a coin cell or a little pack somewhere depending on the model.Leave a comment:
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Re: What's inside overvoltage protectors?
Yeah, spark gap devices have a much longer response time. They're only useful in conjunction with MOVs or transorbs for sensitive equipment....Leave a comment:
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Re: Aluminium capacitors in linear power supply
That only pertains to LDOs, which LM78xx/79xx are not.Leave a comment:
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Re: Aluminium capacitors in linear power supply
They don't really care what you use. Not much benefit unless you plan on flirting with the temperature rating.Leave a comment:
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Re: Digital VRM
As I understand it, a digital PWM controller is required as of Intel's VRD 12 specification, which is what 1155 board VRMs have to comply with, but I can't find a copy of it online. This is just a standardized interface for software control though, not sure if there's a DSP involved in handling the analog end like with those Cirrus PFC controllers.
Software controllable PWM chips have been pretty common for the last several years.Leave a comment:
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Re: Question on ESR and Capacitor Selection.
No, the LM78xx don't care what you put after them. The caps after a switching regulator are part of a pi filter (Wikipedia that) which turns a high frequency rectified square wave into flat DC. Linear regulators have no analog to this.
LDOs want certain amounts of capacitance and ESR on their output. National has a pretty good [URL="http://www.national.com/an/AN/AN-1148.pdf"]writeup[/URL] on the topic and how linear regs work in general if you're interested.Re: Question on ESR and Capacitor Selection....Leave a comment:
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Re: Question on ESR and Capacitor Selection.
You can type all of these terms into Wikipedia and get some answers. ESR is Equivalent Series Resistance, which is the same as a resistor in series with the capacitor. The exact value of the resistor changes with frequency though, and it's dominated by tan(delta) at low frequency and Z at high frequency. If you type "loss tangent" into Wikipedia, you can see an explanation of the relationship.
Usually when they say "Low ESR" caps, they mean "fit for high frequency use", which is basically any...Leave a comment:
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Re: Samxons Vs Mix of NCCs and Ltecs
No, [URL="http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=214"]it's a sleeve[/URL], though there have been many typos to the contrary. Antec at least mounts their sleeve fan properly, but it doesn't really matter if you're comfortable opening the box.
This.Re: Samxons Vs Mix of NCCs and Ltecs
No, [URL="http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story3&reid=214"]it's a sleeve[/URL], though there have been many typos to the contrary....Leave a comment:
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Re: So how bad are OST motherboard caps?
Nichicon (formerly Fujitsu) Functional Polymer. I think Asus custom orders them with that funny color scheme....Leave a comment:
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Re: Corsair HX620
These things are warrantied for 7 years, and they usually pay return shipping. If you haven't opened it up already anyway.Leave a comment:
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Re: Low ESR capacitors in Linear Power Supply
I have a few linear supplies of various sizes with Nichi HE and Panny FM after the rectifier that are several years old, no problems.
I wouldn't worry about inrush protection beyond what the transformer normally needs as long as you pick sane filter cap values.Leave a comment:
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Re: Purpose of -5V and -12V rails
If you're talking about audio line driving applications, your dynamic range is 2V RMS absolute max, so 1mV of ripple is a 66dB noise floor, which you might find on the world's crappiest onboard audio. 200mV is hearing damage country....Leave a comment:
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Re: Purpose of -5V and -12V rails
Yeah, I'd be interested to see what cards these are too. Even the old Lynx TWO got by on split 5V for balanced transmission, and running unfiltered SMPS voltage pretty much destroys your noise floor.Leave a comment:
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