Electronics Forum | Thu Aug 10 07:45:20 EDT 2017 | stephendo
Do not put something randomly together. Go to the UL web site. Ask them your questions. Do not only ask us. Personally I think you would be smart to present the BOM to UL before buying anything. And parts being UL is not the only requirement. Where
Electronics Forum | Thu Aug 31 08:43:40 EDT 2017 | hxamalia
Hello dear Good day , it is Amalia from HX Circuit Technology Co.,Ltd in China, we are a prefessional PCB factory with many years. We forcus on producing Aluminum PCBs for LED , please contact with me now ,thanks Email: amalia@hx-circuit.com Skyp
Electronics Forum | Mon Sep 11 12:30:43 EDT 2017 | slthomas
Great reply, Tom. We do contract assembly of a few UL listed products and when we do, the customer has always done the legwork up front, with UL, to determine which components are critical. Being the manufacturer of record, we're responsible for m
Electronics Forum | Wed Aug 09 11:59:19 EDT 2017 | dleeper
As you already know, it depends on the paste. There isn't really a rule of thumb, but less time exposed it better. The issue is the flux exposure to the air and ambient conditions. The flux can evaporate or absorb moisture from the air. If the paste
Electronics Forum | Wed Aug 09 14:55:42 EDT 2017 | cbeneat
Trying to show documentation/expert opinion to an operator or 2 why it's important to not let a first piece, that they so diligently built for the next shift to let sit for an hour, why that's not a good idea...other than me telling them so. And tel
Electronics Forum | Mon Aug 14 15:09:14 EDT 2017 | charliedci
In my experience, in a temperature/humidity controlled environment, 1 hour, no big deal. 4 hours still ok. Overnight your pushing the limits but will probably reflow without issues. Any longer, could be a problem. Again, a lot depend on type of past
Electronics Forum | Wed Aug 09 12:39:40 EDT 2017 | tanersavas
We want to buy spare parts for TWS Quadra pick-and-place machine for our own business.In this regard, we would be interested in your spare parts price list. Could you send us a price list regarding your spare parts? And if you have the machine we c
Electronics Forum | Sat Aug 26 08:29:58 EDT 2017 | eurolan
Hi, What kind of Quadra do you need? We have a couple of mechanical centering quadras, one is in good working condition, the other one we use for spares. If you are interested we can offer them to you with A LOT of feeders and many other spare (n
Electronics Forum | Mon Jan 08 17:25:39 EST 2018 | vassago
Hi, > > What kind of Quadra do you need? > > We > have a couple of mechanical centering quadras, > one is in good working condition, the other one > we use for spares. If you are interested we can > offer them to you with A LOT of feeders and
Electronics Forum | Thu Aug 10 07:29:43 EDT 2017 | stivais
How do you evaluate the soldering quality for those QFNs? X-Ray or AOI? For some QFNs (and other bottom termination components) it's not supposed to have solder fillets on toes. It's also noted in IPC-A-610 (Rev.F 8.3.13). Take a look at your QFN ch
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