Wizard

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Everything posted by Wizard

  1. Wizard

    The capacitor

    V lags I. Meaning, volt is delayed by 90 deg by I which takes current to charge up that cap to see voltage rise. So voltage rises and falls by 90 degrees. BTW, capacitor DOES not pass current. It is used to isolate two circuits (used in signal transfer) and to buffer & smooth voltage that circuit requiries. Also there is other circuits that uses the C constant of a cap to generate sawtooth of some types. As well as paraola waveform ampified from very weak ripple off a capacitor of low frequency for example to shape the high freq component (ie pincushion). When you have to fix, much of circuits depends on ESR of electrolytics. Once ESR is too high, circuit operates irratically or stop working, or worse blown up. So get a bob parker's ESR meter for this. Cheers, Wizard
  2. Since Seagate, WD, Maxtor, Samsung have not yet implemented the park ramp for 3.5" series that Hitachi is doing for long time. I had to wait for my local store to get back selling hitachi HDs that was YEARS, now yay, I am able to! Just ordered the 160GB hitachi. Cheers, Wizard
  3. Say, for example: I known that people are using CF to IDE adapters and using it as flash disk drive but my question is on the CF adapters to XD, SD whatever as IDE CF disk with IDE to CF adapter? Does this work? Some types of flash cards formats is cheaper than others and I already have CF to IDE adapter, and small collection of CF cards. Cheers, Wizard
  4. Wizard

    Where, oh where, are the Terabyte drives

    Added power requirements to spin the added platters is real. Able to do it within 8W with 4 platters is awesome piece of design (have the deskstar 8). I once took apart many Tandon/WD stepper drives (they're 1 or 2 platter types, 20-40MB, awful high failure rate.) and restacked solid with platters on one of those. Plugged in, it took forever to spin up and didn't spin up to speed as motor had insufficient power to maintain 3600rpm. Even spun up few without platters, and spindle motor took off like a rocket. WHIRR!! Cheers, Wizard
  5. Wizard

    Silent filesystem corruption

    Replace the memory with brand version like OCZ, curcial etc. This is not good as overvolting exposes that memory is bit weak to begin with. Cheers, Wizard
  6. I first saw this 17 years ago too. Changed IDE cable did the fix, myself. That was before the forum was around and the nearest thing was BBS & 2400 baud modem. Cheers, Wizard
  7. I'm considering making my own PVR but first I wanted to see your high quality photo shots of images on Freevo/MythTV recorded stuff from NTSC, 480, 500lines and 720 so on and lightly processed so not to distort the pics or pixelate it. I'm still on the fence because of poor quality screen shots that I could find online. If I can't tell if it was live or recorded then that's a big bonus. If I can see pixelations and distortations like I see all HDTV sets upconverted from NTSC/video/s-video. That will turn me off. Currently all HDTV ready sets (16:9) is 2H and 2.14H horizontal frequency (15.7KHz times (n)H) this means 31.4KHz and 33.6KHz horizontal frequencies this forces makers to use low quality upconverter chipset to upconvert non-HD video signals (NSTC, 720 etc). I'm very allergic to that quality loss, it is like watching on "Yourtube" videos TERRIBLE! In native HDTV resolution (1080) is AWESOME but AGAIN, the quality of NTSC is pretty GOOD in 500 lines like Dr. Who episodes in 1980's. Top of the line upconverter boxes is $1500 and up range. This is major reason I have NOT YET ditched all CRTs with NTSC tuners. And I wanted to know how good these Freevo & MythTV fare with digitalizing the analog signals in quality-wise. Thanks! Cheers, Wizard
  8. Wizard

    how high a fall could one survive into water?

    This kind of height (ie Golden Gate) falling into water is sure death. I have heard about it from other discussions about same take. Cheers, Wizard
  9. Wizard

    Old skool RAM compatibility

    You need 256MB 16 chip module if the motherboard is older than intel 815 chipset. Expect to pay permium for that. Cheers, Wizard
  10. I had same "squeak" on spinup and spindown on old Maxtors like 200MB, 400MB, 1GB or so. I can feel it squeaking/short beep just touching hard drive top when doing that. Cheers, Wizard
  11. I saw a demo of this 940BF and looked up specs for 940BF and really like it. Ok, is these panels still 6 bit design like the prior older fast ms response LCDs were? (8ms to 20ms range). Cheers, Wizard
  12. Wizard

    2ms G-G response time LCDs.

    More thinking and clues finally got google gave up info I wanted to see. Currently all TN-based panels are 6 bit. The 940BF is 6bit with RTC and dithered, also FRC. There are other TN models did without FRC. I'll keep looking. The local store only have 940BF, the VG922 not here. Either I wait for SED or hyperfast LCD panel around 0.5ms except my 4 years old samsung 793MB is finally getting dimmer. Cheers, Wizard
  13. Wizard

    2ms G-G response time LCDs.

    Edit: Samsung 940BF
  14. Wizard

    Conroe

    Also one thing have to consider, conroe shines brightly on lower watts and improved processor performance. Wattage is one of my major reasons for sticking with AMD till then. Cheers, Wizard
  15. Wizard

    problems with dual Opteron system

    Good points on these. Mostly common sense stuff. Tyan, I had trouble with two before (socket 7 days), may have to get non-Tyan dual-CPU board instead. 1. Is the CPU heatsinks mounted PROPERLY? 2. If chipsets have heatsinks or have fans on them, best to change them over to larger chipset heatsink with some artic paste. 3. What kind of case is it is and good air flow design practice? Cheers, Wizard
  16. Wizard

    bizarre prob with CRT

    Viewsonic is not a brand maker, it is a rebrander of other monitor makers. I had 70F opened and was very GENERIC quality. I think the PC didn't sense the certain correctly grounded pin (basis for IBM standards) to tell the onboard chipset monitor is connected. Cheers, Wizard
  17. Wizard

    problems with dual Opteron system

    for anyone who need to know the max watts of specific processors, google for: erols processor specification and click on first link. There are two kind of Optrons one is 246 at 89W each and other one is 246HE at 55W appox. Was thinking and revised the wattage estimate so bear with my thoughts: Figuring 89W each, for typical 200W for two CPUs (don't forget the regulator losses). Also does have lot of stuff to account for. Say you have more than 2 HDs let's say 3, 12W each (seeking/reading/writing). Video card if it is mid range, say 50W. Memory say 5W or so per stick anything more it won't work since 10W requires heatspreaders. Add 3W for each fan (typical machines 3 to 4 fans) Cdrom pulls hard on 12V while actively using (reading or burning) so give it 10W. Give another 15 to 20W for assorted cards. Then you have appox 340W with 25% fudge factor added will be: 425W bit too close to capacity for most 500W PSUs. Should go with quality 550-600W range PSU. Several years ago Toms hardware did several stress tests on several PSU, many shut down or drooped excessively, and in one case one blew up! MOST of them shut down or fall out of regulation well below their rated specs. Just to keep in mind. Keep us updated! Cheers, Wizard
  18. Wizard

    problems with dual Opteron system

    Chewy509, "OCZ also tend to buy from the cheapest supplier at the time, so you may never get what you expect. (Eg 2 sticks of the same model, may in fact actually use different brands of chips on the sticks)." OUCH! That's no fun. Except I bought two dual sticks on seperate occasions once for 256MB pair and other one 512MB pair, good so far. Now, what is the good memory module that doens't pull a joke on me with mismatched chips? Dropping below rated speed is PERFECTLY fine, I have been known to run DDR400 as 333, even 200, no problems. Cheers, Wizard
  19. Wizard

    problems with dual Opteron system

    Thanks for correction on that ram choices for multi-CPU setup. But, for 1 socket applications (run of mill stuff, no SMP boards stuff), these memory are ok for this? I repair electronics (TVs mostly) as full-time job so I have experience. Cheers, Wizard
  20. Wizard

    problems with dual Opteron system

    Now I remember about comment on memory choices. Yes very picky with multi-CPU boards. PSU is not rated by the MAX power. It is surge max power that PSU can provide for short time. For steady use, take a typical total watt and add 25% fudge factor and you have it. For example you figured 300W, this is bit too low really. Ram, chipsets, video, network, etc cards can consume around 100-130W, dual CPUs around 200W at the most because of voltage regulator losses. Hard drives is typically 11-13W writing/seeking. If have another HD or two, That's 39W if have 3 hard drives for example. Add this all up is nearly 370W, plus 25% fudge factor gives you 465W. A decent 500W PSU is sufficient. Oh yea, fans are not power misers, many can eat up 3W to 5W per fan. High performance fans even eat up 10W and that's even for a 6800rpm 60mm whiners. You don't have to buy stuff, borrow or test swap certain parts one at a time to isolate the problem. Quality ram is a MUST especially for multi-CPU system. OCZ, curical, etc are ones should have. Cheers, Wizard
  21. Wizard

    problems with dual Opteron system

    Antec only resells power supplies made by others. I prefer to buy PSU directly seperate from case. I like silverstone and one others. Especially one with 120mm fan for quietness. Cheers, Wizard
  22. Wizard

    problems with dual Opteron system

    Replace power supply (no names is crap, get one like silverstone or such) and replace the NIC with decent brand like 3COM etc. Cheers, Wizard
  23. Picked up E7K60 40GB version, vibrates with platter rotation. Some spin smoothly, some buzzed. Best solution is find heavy thick metal plate and attach each HD to this via four screws to try to damp out low frequency vibration. Hi to medium frequencies are easy to asborb than low ones. Cheers, Wizard
  24. Um, this side stepping the question; I have been researching these chipsets and asked about which one is stable & "data-safe" here because I value your thoughts. Reason I came here is that other forum sites isn't "straight" or practical comments on these. Please? Cheers, Wizard
  25. No overclocking, seems I always gets CPUs that won't goose when pushed so let's leave that for now. Doing this for two new PC build ups for our TV shop, one for low bandwidth server and one for my co-worker's. Will run 2000 Pro because several other software latest versions needed to work for web browsing is no longer supported in 98 so we're limping along with last versions. Can't go XP, need to keep running DOS program that is vital to our TV shop. There is alterative softwares but this ancient program was built with OUTSTANDING features that isn't found in alterative software. Asus is my primary choice and served me rather well except for rare models eons ago that wasn't. Okay, All are Socket 939 I'm considering except Intel: Nforce4? I hear this chipset corrupts data but many are happy with this but none are asolutely sure to "pin" down the problem, glossing it over for other features most liked. I prefer computer very stable & won't corrupt data is important for me. VIA: K8T800Pro, K8T890 chipsets (A8V-MX, A8V-E SE) Most are still having bad memories about past VIA problems and I prefer to hear your experiences with these current chipsets are doing at present. I had no problems with A7Pro (based on A8V and was great one for me but performance is bogging down so I had to upgrade to K7V400-MX (KM400A) with barton core sempron 3000+. Doing great on 98 too. Intel: I know they're good but I find Intel tend to push for stuff that we must invest in DDR2 & hot processors that I don't like to do till Intel comes around and get cooler CPUs out, they are doing now but that's a year to two years away when we then have budget again for upgrades. Finally: confirm that Athlon 64, Sempron 64, Intel CPU that have 64 bit support can run legacy softwares (32 and 16 bits)? So help me out with these, be impartial. Cheers, Wizard