http://www.usr-emea.com/products/p-b...specs&loc=mest
Any good of this model? Generally, is it reliable and HQ product?
Thanks
Any good of this model? Generally, is it reliable and HQ product?
Thanks
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3COM OfficeConnect Gigabit Switch 16 (3C1671600)
The switch has served me for 10+ years (was new when I bought it). It's a nice switch with connections on the back which makes for quite a clean desk. Reason for taking it apart was that the cooling fan was noisy so I expected it to be dirty/dusty inside and the need to order a new fan. What I found was that it was very dirty/dusty and some electrolytic capacitors which needs attention. There are 3 capacitors which needs to be replaced but the ESR on some of the other ones might be bad as well so I think I'll replace them all. Original... -
For those in 220V locales, anyone power their SMPS with DC, and how high of a voltage is okay?
What kind of PSU?
I suspect that 240V * sqrt(2) = 340V DC is probably fine because that would be about how much the the primary rectifier ends up with peak voltage. Just wondering, other than input capacitor voltages, can one go up above this 340V without damage? Will that input capacitor be the upper bound?
Wondering if exactly that, can I feed near 400VDC into bona fide specced at 220V SMPS without damage?
Currently have a 120/220V switchable SMPS I want to see if I... -
Hey guys, not sure if this is the right forum, but does anyone have a reliable source for BGA chips such as PCH, south bridge, etc? Tried different sellers on Aliexpress but its more of a "1 out of 3 faulty chip" experience with them.
I remember reading a thread on this topic here but I can't seem to find it anymore. -
Hello. I'd like to get suggestions for a reliable PSU with good caps and low ripple with +5V (adjustable), +12V and optionally -5V. I don't really need the -5V but it would be nice to have this output too.
I've read good things about the Meanwell MWP-606A with 50mV ripple for the +5V output (the most important for my application) so I've called to an official distributor. Sadly this PSU is not produced anymore and the replacement they suggest me (TP-100A) has 100mV ripple noise, more than the 80mV of the RT-125A I'm currently using.
Apart from this second PSU I plan... -
I'm not sure if I am posting this in the right spot, I don't have any question or anything specific to one board. I am *kinda* starting out with this kind of work. I have been IT in one role or another for my job the last 30 years, and I am familiar enough with basic board stuff generally speaking. So, I dunno for example if someone told me to find a uart header, or flash some generic tsop8 something, etc I understand that kind of stuff. Point being, I'm not 100% clueless. I just don't have the specific knowledge when it comes to some of these more advanced repairs. I actually have spent the last...
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