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1answer
75 views

Surface Mount Adapter PCB With Castellated Holes

I have some prototype boards that I would like to modify. The modification includes removing a section of circuit and replacing it with another circuit. My theory on how to do this is to make an ...
0
votes
2answers
157 views

Automatic SMT Line PCB Soldering [closed]

I am planning to create few circuit boards. I am considering getting the PCB printed from a manufacturer and do the SMT via a machine my self. Do you think it is good idea. The reason i an planning ...
3
votes
2answers
713 views

Why were hobbyists advised to socket ICs before, but not now? [closed]

When I was little, the general advice for electronics hobbyists was to socket all their ICs. Indeed you would find the word must referring to the need for sockets. This was to prevent thermal damage ...
7
votes
2answers
696 views

SMD footprint design: Heavy copper, pad width smaller than pin width?

I'm working on a high power board that's using heavier (4oz) copper. I have an IC on this board in a 0.8mm pitch QFP-32 package (no other package options available). The IC's datasheet says the pin ...
1
vote
1answer
219 views

Pastemask. Manufacturing PCBs

after finishing some designs, it is time to manufacture and assemble them. For making these designs I have to create all padstacks, footprints, etc from scratch, so I took PCB Editor examples as ...
2
votes
1answer
2k views

SMD component clearance limitations and guidelines?

I'm laying out a fairly compact PCB (first SMD design of this degree) and am concerned about how close some of my SMD components are getting. I've been unable to find any guidelines or advice online ...
10
votes
3answers
1k views

What is this adhesive tape that comes in some parts?

I think this is a Mylar tape, but why they come with it? I guess its so to make the Pick and Place machine job easier? And why is so common to find them holding cables inside some laptops? Just ...
3
votes
5answers
587 views

Covering PCB Pads

I have a PCB that was poorly designed and there is a ground pad that is too close to a signal pad. As a result, the signal pad on the surface mount component will short to ground. I was looking to use ...
7
votes
3answers
4k views

Is it advisable to use lead-free PCB and solder paste on a first SMD assembly job?

I am sending my first PCB design to Sunstone for manufacture and I need to decide whether to order the board finish lead-free. All of the components are lead-free, and I have not decided on solder ...
0
votes
1answer
2k views

Why can't I find cheap TQFP 44 sockets?

I am trying to find a reasonably priced socket for a TQFP44 microcontroller but I am having a very hard time. The only I found so far is this one: http://uk.farnell.com/wells-cti/7010-044-6-08/...
18
votes
13answers
5k views

Recommended PCB houses / Assemblers [closed]

Can anyone recommend a good place to go making PCB's? I'm particularly interested in places that also offer assembly, because this makes SMD parts an option. GoldPhoenix is an option, but not the ...