Electronics > Beginners

A switching power supply in an oscilloscope?

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tooki:

--- Quote from: Zero999 on March 13, 2019, 08:54:29 am ---
--- Quote from: tooki on March 13, 2019, 01:41:51 am ---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.

--- End quote ---
I don’t think it’s fair to judge reliability based on a device run beyond its limits. An overloaded SMPS isn’t gonna last, either. I didn’t think it was necessary to specify that I’m talking about power supplies that are being run within their design specs. But with that constraint, I think it’s absolutely fair to say that a transformer power brick is going to outlive a switch mode one.

David Hess:
There is just less to go wrong with a 50/60Hz transformer compared to a switching power supply so it takes more effort to make the later equally reliable.

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