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| A switching power supply in an oscilloscope? |
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| james_s:
A lot of switchmode power bricks and wall warts are not terribly reliable either. I think I went through 3 of them (output capacitor failed) on my broadband router before I got fed up and dug out an old iron transformer type and used that. It has lasted longer than all of the switchmode adapters combined, which is worth the small efficiency penalty to me. |
| rsjsouza:
--- Quote from: james_s on March 12, 2019, 09:20:07 pm ---A lot of switchmode power bricks and wall warts are not terribly reliable either. I think I went through 3 of them (output capacitor failed) on my broadband router before I got fed up and dug out an old iron transformer type and used that. It has lasted longer than all of the switchmode adapters combined, which is worth the small efficiency penalty to me. --- End quote --- Funny you mentioned that. I have gone through a few power supplies for the broadband modem and I also got fed up with them. In my case, I used a very nice switching power supply I had saved on my stash. I got them after people at work were scrapping zillions of old development kits that had become obsolete but featured top quality switching power bricks of different voltages (5V, 12V, 24V) and output currents (4, 5, 9A...). |
| tooki:
--- Quote from: james_s on March 12, 2019, 09:20:07 pm ---A lot of switchmode power bricks and wall warts are not terribly reliable either. I think I went through 3 of them (output capacitor failed) on my broadband router before I got fed up and dug out an old iron transformer type and used that. It has lasted longer than all of the switchmode adapters combined, which is worth the small efficiency penalty to me. --- End quote --- Yep, in my experience the switch mode wall warts aren't anywhere near as reliable. (In all fairness, the switch mode wall warts are largely quite reliable; it's just that linear wall warts are incredibly reliable.) |
| Zero999:
--- Quote from: tooki on March 13, 2019, 01:41:51 am --- --- Quote from: james_s on March 12, 2019, 09:20:07 pm ---A lot of switchmode power bricks and wall warts are not terribly reliable either. I think I went through 3 of them (output capacitor failed) on my broadband router before I got fed up and dug out an old iron transformer type and used that. It has lasted longer than all of the switchmode adapters combined, which is worth the small efficiency penalty to me. --- End quote --- Yep, in my experience the switch mode wall warts aren't anywhere near as reliable. (In all fairness, the switch mode wall warts are largely quite reliable; it's just that linear wall warts are incredibly reliable.) --- End quote --- In fairness, some linear power supplies are also unreliable. Quite often the transformer is undersized and overheats. If you're lucky the thermal fuse blows, otherwise it can meltdown. |
| james_s:
I don't think I've ever had an iron transformer wall wart fail except in one case where a short circuit on the output blew an internal fuse. Some of the switchmode wall warts are quite reliable too but many are not, particularly the extremely compact type. |
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