| Forum Home | ||||
| Press F1 | ||||
| Thread ID: 43255 | 2004-03-08 19:06:00 | Dynalink switch gotcha - FYI | tbacon_nz (865) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 221130 | 2004-03-08 19:06:00 | Lotsa problems with my home network were finally tracked to a faulty Dynalink switch. The power supply brick was faulty. Apparently it is a known problem, so if you have problems with your Dynalink switchgear, that may be the first place to look. Note that even with the dodgy power, the power LED on the switch still lights, so don't be fooled. |
tbacon_nz (865) | ||
| 221131 | 2004-03-08 19:15:00 | Good safety tips, thanks. robo. |
robo (205) | ||
| 221132 | 2004-03-08 20:44:00 | I had the same problem with my RTA300 power brick about a year ago. Dynalink replaced it without question. Dynalink don't make the bricks. John |
John H (8) | ||
| 221133 | 2004-03-08 21:13:00 | Mine got replaced too, no problem. Although Dynalink don't make the bricks, they do source them, and if you had a problem a year ago, you would have thought they might have changed spec/supplier by now. | tbacon_nz (865) | ||
| 221134 | 2004-03-08 22:21:00 | I wuz going to say that tbacon, but I didn't want to be too critical given the great service they gave me at the time... However, true! John |
John H (8) | ||
| 221135 | 2004-03-08 23:27:00 | It happens a lot, look at what happened with Nokia and the M1122's, they did two separate recalls on them. It happens to the best of them, but can be damn annoying when an intermittent power problem stuffs things up. Better to have a full-on problem. robo. |
robo (205) | ||
| 221136 | 2004-03-08 23:55:00 | It's a natural consequence of the commodity/cheapness obsession of all consumer computer gear. Cheap power supplies are never going to be reliable. If they have transformers, they will run hot, because they have the thinnest possible wire, and the least possible "iron". As they get hotter, the resistance of the copper goes up, and the output voltage drops. And the wire gets hotter. ;-) I suspect the switchmode(transformerless) power bricks are better, but I don't know what the failure numbers are. But at least you're likely to get either the correct output voltage or none.:D |
Graham L (2) | ||
| 221137 | 2004-03-09 00:04:00 | I saw the innards of a transformer for one of those 12 or 14volts kitchen downlights and the new solid-state version which is half the weight and doesn't have a transformer about six inches wide in it. I assume that PSUs for laptops don't use transformers any more. robo. |
robo (205) | ||
| 221138 | 2004-03-09 00:29:00 | Just like desktops, monitors,etc. I must confess that I made a "minor error". :D They still use transformers but with ferrite cores, and run at kHz rather than 50/60 Hz. So they are much smaller and lighter. (They also don't need jumpers on the primary for 110/240 selection) . I was thinking of the last SM supplies I have been looking at which are the car adaptors for cellphones which don'thave transformers. They don't need isolation from the mains. :D Most SM supplies rectify the mains, then switch the dDCat high requency to a ferrite transformer with multiple secondaries. The regulation is usually on the 5V (or 3.3V) output, because that's the only critical voltage. 12V and negative lines can vary a bit with no problems. The beauty of the SM supplies for halogen lamps is that they have a soft start. You can actually see the brightness ramp up. This would give a great increase of lamp life by removing the surge. Iron cored transformers are expensive. |
Graham L (2) | ||
| 1 | |||||