View unanswered posts | View active topics It is currently Sun Nov 18, 2018 10:42 am



Reply to topic  [ 4 posts ] 
First attempt at Surface mount soldering 
Author Message
LQFP112 - Up with the play
User avatar

Joined: Wed Jul 16, 2008 9:21 am
Posts: 140
Location: NSW, Australia
Here's a little pic of my first attempt at SMT.
It's a logic probe kit that uses a PIC10F202. Indication is with a red LED (1), green LED (0) and an amber LED to indicate a change in logic level.
I found good old blu-tack was useful to hold the parts in place for the first solder join.
Image

The only trouble with the kit is finding a clear pen casing that this fits in.


Thu Jan 15, 2009 5:46 am
Profile
1N4001 - Signed up
User avatar

Joined: Tue Jun 10, 2008 5:17 pm
Posts: 1607
About SMT soldering, check out this page.

http://www.zianet.com/erg/SMT_Soldering.html

This guy recommends the use of some semi special hardware. In my opinion the solder paste makes a world of difference. I'd recommend getting some solder past from this fellow, or where ever you can get it. I think you'll find the SMT soldering is actually easy, easy if you have the solder paste that is.


Thu Jan 15, 2009 11:22 am
Profile
LQFP112 - Up with the play
User avatar

Joined: Wed Jul 16, 2008 9:21 am
Posts: 140
Location: NSW, Australia
I'll agree the solder paste or a flux pen would make the job easier.

Over all I still found SMT easy and would like to use it a bit more. Maybe in my next work project. 8-)


Mon Jan 19, 2009 4:34 am
Profile
Wideband Wizard

Joined: Tue Jun 10, 2008 2:53 am
Posts: 241
Location: Toronto Canada
I have only used 1 type of paste, I am not sure if better paste is available.

I found that solder paste is lumpy, air bubbles get into the syringe, and that makes applying small amounts of paste uniformly very very hard. I am not sure if there is smoother paste out there, I buy my paste from circuitspecialists. Paste also has a tendency to turn into an even more of a lumpy mess over time.

Using sold core solder and tinning the pads is easy and very quick.

I do 99% of my SMT work with a fine iron and sold core solder. I only use the hot air tool at the very end, mostly to make the board look pretty. I apply lots of flux and then use the hot air, it does a good job at straightening crockedly places resistors/caps and makes most of the ugly joints look clean.

If you do not have a hot air tool and paste, I do not think you are missing out on much. The exception being that desoldering SMD components with more than 2 pads is virtually impossible without a hot air tool.

My opinion is that for fine SMD work a nice fine tipped iron and a nice set of tweezers is more important than a hot air tool and paste.

http://www.dealextreme.com/details.dx/sku.7042
That is what I use for tweezers, that are fantastic.

http://www.dealextreme.com/details.dx/sku.4711
That paste is dirt cheap, I have not used it but I am going to get some once my current paste gets used up or goes totally bad.

_________________
www.14Point7.com


Mon Jan 19, 2009 5:01 am
Profile WWW
Display posts from previous:  Sort by  
Reply to topic   [ 4 posts ] 

Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group
Designed by ST Software for PTF. ColorizeIt.