Electronics Forum: (4) (Page 386 of 630)

Thinking of Led lamp and resistor

Electronics Forum | Fri Oct 28 04:56:12 EDT 2016 | lilybell

I read a few posts here about resistor in led applications. The thing is, the resistor has clarified as this shows:was always use with a power source delivering a higher forward voltage than the led could tolerate(ex: a 9volt battery hook up to a 3w

Re: Hot Air Knife

Electronics Forum | Mon Mar 13 14:41:22 EST 2000 | Boca

By Hot Air Knife I assume (leave it alone Dave F.) that you mean a debridging knife located at the exit end of a wave solder machine. Russ is right, they are not a good substitute for a good process, but once the process (w/o HAK) is developed, it

Re: Hot Air Knife

Electronics Forum | Mon Mar 13 14:45:01 EST 2000 | Boca

By Hot Air Knife I assume (leave it alone Dave F.) that you mean a debridging knife located at the exit end of a wave solder machine. Russ is right, they are not a good substitute for a good process, but once the process (w/o HAK) is developed, it

solder paste profiles

Electronics Forum | Thu Feb 24 16:08:54 EST 2000 | Gary

I have the situation where we may need to use a variety of reflow temperatures. It seems that the design engineers want us to try a variety of "unspecified" pastes on the products. For example, the first PCB would be assembled using a higher temperat

Re: BGA SOLDER BALL to SURFACE PAD size relationship

Electronics Forum | Thu Feb 24 13:28:31 EST 2000 | Dave F

Robert: Ah, opinions are like mothers, everyone has one. Here's mine: 1 Goto the Altera site, get a copy of "AN 114," follow it. Generally, manufacturers are closer to the requirements of their components than others are. 2 Metal showing on the b

ICT information needed

Electronics Forum | Tue Feb 22 07:59:54 EST 2000 | Hany A. Salam

Hello friends: In a few weeks we will have to assemble PC motherboards. We decided to use to purchase an ICT for testing the semi assembled boards (I mean with only SMD components on). Would anyone kindly like to recommend a SPECIFIC brand or model

Re: Apply glue with a stainless stell stencil

Electronics Forum | Sun Feb 13 19:04:13 EST 2000 | Jackie Hsieh

First I'm a Taiwanese people so excuse my bad english writing. On my experience, The process of double side SMT procedure with two methods ---First one is appling the glue on the solder side, and placeing the R,C,L chips components on it.and 2nd one

bad connections, or not?

Electronics Forum | Fri Jan 12 16:35:00 EST 2001 | Steve Thomas

I've got a question: Can a joint look good externally, even under 45X magnification, and not be mechanically and/or electrically sound? I thought that if the wetting angles were sufficient, there's no discoloration from extreme thermal distress, or

Re: Solder Paste Height

Electronics Forum | Sat Jan 06 21:56:54 EST 2001 | Greenman

While solder paste height is one possible process indicator, the other guys are right on the money - volume is key. One way to study overall paste volume is to measure every single pad, using a 3D laser analysis (see you next week for board 2)... OR

Re: converting from 0805's to smaller packages

Electronics Forum | Sat Jan 06 10:52:09 EST 2001 | Steve Thomas

I don't know the specs. of our MSHII's, as I'm sort of detached from that part of the process, but supposedly they are capable. Panasonic also recommends we buy all new feeders (well, big surprise there), because of the risks involved with retrofitti


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