| Electronics > Beginners |
| Cheap chineese power supply missing short-circuit protection |
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| dominicM:
--- Quote from: madires on May 13, 2018, 02:12:31 pm ---A lot of assumptions >:D Please ask some SMPSU greybeard to explain the issues (I'm ain't one). --- End quote --- That's true but I think a good PSU would be safe (not necessarily reliable) even when modded this way. This one doesn't even have short-circuit protection so that's the more important question here. Hopefully someone with a great bushy beard comes along to school me on these issue :) |
| janoc:
--- Quote from: dominicM on May 13, 2018, 02:19:34 pm --- --- Quote from: madires on May 13, 2018, 02:12:31 pm ---A lot of assumptions >:D Please ask some SMPSU greybeard to explain the issues (I'm ain't one). --- End quote --- That's true but I think a good PSU would be safe (not necessarily reliable) even when modded this way. --- End quote --- Eeeh ... Ever thought about what will happen when the control loop fails because you have pushed the supply beyond its original design limits? Keep in mind that there is mains voltage there, with a ton of current readily available from the outlet. Big bang would be the least bad situation ... You are making some very dangerous assumptions there. Even good quality supplies are not designed nor guaranteed to be safe when operated outside of their spec. And given that the supply you are trying to modify is dodgy at least (it is right there, in the article you are using as a guide - that creepage distance "fix" is ... ouch!) :-// |
| dominicM:
--- Quote from: janoc on May 13, 2018, 06:00:33 pm --- --- Quote from: dominicM on May 13, 2018, 02:19:34 pm --- --- Quote from: madires on May 13, 2018, 02:12:31 pm ---A lot of assumptions >:D Please ask some SMPSU greybeard to explain the issues (I'm ain't one). --- End quote --- That's true but I think a good PSU would be safe (not necessarily reliable) even when modded this way. --- End quote --- Eeeh ... Ever thought about what will happen when the control loop fails because you have pushed the supply beyond its original design limits? Keep in mind that there is mains voltage there, with a ton of current readily available from the outlet. Big bang would be the least bad situation ... You are making some very dangerous assumptions there. Even good quality supplies are not designed nor guaranteed to be safe when operated outside of their spec. And given that the supply you are trying to modify is dodgy at least (it is right there, in the article you are using as a guide - that creepage distance "fix" is ... ouch!) :-// --- End quote --- Well the upper limit is only exceeded by 3V (12V to 15V) and from what I've read going lower should be safe enough. I mean components won't blow up due to lower voltage... As far as dodgy supplies, I bet most cheap supplies somewhat dodgy. How many hobbyists are going to pay 150€ vs 15€ for a PSU for a non-critical project... I've seen plenty of tear downs of seemingly respectable widely used hardware that have same creepage and other issues so I don't know how worried you can be when it's all around you anyways. I can't imagine for example those 8€ laptop replacement adapters are any better. In the end I don't really know, that's why I asked. In any case I won't be using this particular PSU, will try and get one that at least has all it's components. |
| bob225:
RS, Mouser And Farnell all stock meanwell be aware some models are country specific, What spec do you want ? |
| dominicM:
--- Quote from: bob225 on May 13, 2018, 06:43:00 pm ---RS, Mouser And Farnell all stock meanwell be aware some models are country specific, What spec do you want ? --- End quote --- 5V up to 200-400W max but 5-12V variable is appealing since I may not need the 5V after some time... RS or even Farnell is the best for my location as Mouser shipping was like 25€ last time. |
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