- MOVs - 4 Updates
- DVD Rewinder - 1 Update
- MSI: MS7204 (945P). - 1 Update
| Cursitor Doom <curd@notformail.com>: Apr 22 07:47PM Thanks for that correction, Jeff. Yes, in my haste I got the wrong term for the component in question. Must be my advancing age. :( |
| crapler8@gmail.com: Apr 22 04:42PM -0700 rosoft Help got to www.cccam-host.net |
| Phil Allison <pallison49@gmail.com>: Apr 22 06:44PM -0700 Cursitor Doom wrote: > of a matchbox and they tend to fail short and blow the fuse. The ones > I've seen are usually rated for 1A since the only stuff I do is low > power. ** Going short circuit is likely the result of one of the capacitors across the AC line failing - generally these are "class X" types which have a limited life expectancy. The other possibility is the "common mode" choke but that is very unlikely. > However, some of that low power stuff is test equipment with SMPSs > that initially look like a short circuit at power-on. I think this is > what blows those filters. ** Very unlikely too. The surge current may be quite large but also very brief, so not enough energy to damage copper winding wire which in any case would blow open. > Early SMPS designs didn't seem to pay much > attention to surge prevention ** So the equipment IS rather old ? Like 20 years + > so I'm wondering if it would pay to > retrospectively fit MOVs at the beginning of the SMPS section to prolong > filter and power supply life (hopefully). ** Small SMPSs can use a resistor in series with the supply to limit surges - say 5 or 10 ohms, wire-wound. Otherwise it is normal to use an NTC thermistor with similar cold resistance values. The resistor or NTC limits the surge current to a value that is tolerated indefinitely by fuses, diodes and switches used in the PSU - ie something like 20amps peak for a couple of milliseconds. PSU makers also have to consider the situation where multiple supplies are on the same AC circuit and all switched together creating a very large surge that may trip the breaker. .... Phil |
| Cursitor Doom <curd@notformail.com>: Apr 23 10:38AM On Fri, 22 Apr 2016 18:44:11 -0700, Phil Allison wrote: > across the AC line failing - generally these are "class X" types which > have a limited life expectancy. The other possibility is the "common > mode" choke but that is very unlikely. Yes, most like a cap. > ** So the equipment IS rather old ? Like 20 years + Almost always. Typically 70s & 80s. I can't deal with SMDs anyway. > ** Small SMPSs can use a resistor in series with the supply to limit > surges - say 5 or 10 ohms, wire-wound. Otherwise it is normal to use an > NTC thermistor with similar cold resistance values. Noted, thank you. |
| Jeff Liebermann <jeffl@cruzio.com>: Apr 22 06:39PM -0700 On Wed, 20 Apr 2016 03:56:16 -0700 (PDT), thekmanrocks@gmail.com wrote: >You actually got that "Lightscribe" thing >to work?? Not me. I tried it a few times and gave up. It takes forever, produces ugly looking monochrome CD labels, requires special expensive media, and seems to use buggy HP software: <http://hubpages.com/technology/lightscribe> No thanks. An inkjet CD printer works better. <https://printinginnovations.cusa.canon.com/pixma/cd_dvd_printing> However, if it ever can be made to work in color or obtain better mono contrast, I might try again. -- Jeff Liebermann jeffl@cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
| "Ian Field" <gangprobing.alien@ntlworld.com>: Apr 22 09:03PM +0100 My MSI945GZM motherboard is getting flaky, the only other MOBO I have is a MSI MS7204 (945P). The GZM has a normal CPU cooler - the 945P has a huge cooler with copper pipes running through a big stack of fins. That cooler overhangs the edge of the board and won't fit a case that has drive bays. Is there an information resource that deals with which coolers can be used with what boards/CPUs? Thanks. |
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