| Electronics > Beginners |
| Improving small unregulated power supplies |
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| soldar:
--- Quote from: Zero999 on October 15, 2019, 11:17:47 am --- What about reliability? --- End quote --- I am not sure I understand. What about it? You think those regulators are not reliable? |
| Zero999:
--- Quote from: soldar on October 15, 2019, 12:03:33 pm --- --- Quote from: Zero999 on October 15, 2019, 11:17:47 am --- What about reliability? --- End quote --- I am not sure I understand. What about it? You think those regulators are not reliable? --- End quote --- You previously said you had problems with switched mode power supplies being unreliable, so I'm surprised you want to add one to the output. You might as well just use a reliable, decent quality, switched mode wall wart in the first place. |
| soldar:
The purpose of this is to use the unregulated PSUs I already have. And I don't think I could find SMPS for the price of those regulators. In the photo two Samsung PSUs which have failed within one year of each other. I keep saying I am going to look into them even if it is just to determine the cause of failure. |
| soldar:
Come to think about it the ideal regulator for an unregulated mains supply would be a buck-boost, SEPIC or Cuk which can output higher or lower than the input. That way there is no problem even if the input voltage sags a bit under the output voltage. Otherwise I have to choose an output voltage which is lower than the input might sag. E.T.A.: I had a look in Aliexpress and it is amusing how sellers throw in words just to attract views. Buck boost buckboost stepup stepdown step up voltage converter module power supply ... You have no idea what you might be buying, but, hey, for under a dollar what would expect? |
| Gyro:
Surely one of the two main reason for an unregulated brick is quietness (that and reliability). Once you've accepted the lower efficiency, aren't you most likely to want a nice quiet linear regulator? |
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