0

Starting Out in SMT
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Re: Starting Out in SMT

by terryd1 on Sat May 04, 2013 4:55 pm

Hi,

Recently, my partner has indicated that she is willing to have a go at SMD after finding that thru hole is not so hard.

There were some sample pcbs released by adafruit_support_mike a while back (Feb 2010) eg http://info.yawp.com/blog/2012/36/smt-t ... index.html to name one of a few mentioned.

This server now appears unreachable. Does anybody have these files or are they available on another server?

I would really like to see my wife progress onto SMT building something she would find useful!

Regards

Terry

terryd1
 
Posts: 6
Joined: Tue Jan 01, 2013 5:15 am

Re: Starting Out in SMT

by adafruit_support_mike on Sun May 05, 2013 6:58 pm

For the past few days my servers have been getting hit by an Eastern European botnet trying to exploit BIND vulnerabilities. BIND is the software that makes DNS work, so my ISP and I have been blocking and altering the DNS traffic to keep the attack from taking down the whole network. That's messing with their visibility online.

I can see that server from where I'm sitting at 6pm Sunday night, so hopefully you'll be able to see the projects again before long.

BTW - big kudos to your wife on starting SMT. It isn't hard, and is fun once you get used to it. ;-)
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

adafruit_support_mike
 
Posts: 45167
Joined: Thu Feb 11, 2010 2:51 pm

Re: Starting Out in SMT

by terryd1 on Wed May 08, 2013 11:08 am

Thanks Mike

I have passed on your comments to my wife.

I still can't see the server but I will keep trying now I know it is intermittent

Regards

Terry

terryd1
 
Posts: 6
Joined: Tue Jan 01, 2013 5:15 am

Re: Starting Out in SMT

by terryd1 on Mon May 20, 2013 8:14 am

Hi Mike,

I still can't get to the link above at :

http://info.yawp.com/blog/2012/36/smt-t ... index.html

Is the server up? I get a message saying the server is not contactable in the browser - it actually comes back as an unknown host by ping.

Regards

Terry

terryd1
 
Posts: 6
Joined: Tue Jan 01, 2013 5:15 am

Re: Starting Out in SMT

by adafruit_support_mike on Mon May 20, 2013 3:45 pm

The servers are still down thanks to a truly amazing combination of botnet, power, cabling, and record-keeping issues. Rather than making you wait through the meteor strike that I'm expecting next, I'll attach the compressed projects to this thread.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

adafruit_support_mike
 
Posts: 45167
Joined: Thu Feb 11, 2010 2:51 pm

Re: Starting Out in SMT

by adafruit_support_mike on Mon May 20, 2013 3:49 pm

Okay: this attachment contains the files for the square wave generators.
Attachments
smt-square-wave.zip
SMT Square Wave
(208.72 KiB) Downloaded 329 times
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

adafruit_support_mike
 
Posts: 45167
Joined: Thu Feb 11, 2010 2:51 pm

Re: Starting Out in SMT

by adafruit_support_mike on Mon May 20, 2013 3:50 pm

This attachment contains the design files for the pulse generators:
Attachments
pulse-generator.zip
(184.43 KiB) Downloaded 327 times
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

adafruit_support_mike
 
Posts: 45167
Joined: Thu Feb 11, 2010 2:51 pm

Re: Starting Out in SMT

by adafruit_support_mike on Mon May 20, 2013 3:51 pm

This attachment contains the design files for the mosfet-controlled LED indicator boards:
Attachments
led-boards.zip
(679.42 KiB) Downloaded 345 times
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

adafruit_support_mike
 
Posts: 45167
Joined: Thu Feb 11, 2010 2:51 pm

Re: Starting Out in SMT

by Gabriel.P on Wed May 29, 2013 3:17 am

Mike where I can use led-boards? And what is SMT and SMD can you tell me please.
Gabriel.P
 
Posts: 4
Joined: Mon Mar 25, 2013 3:33 am
Location: Los Angeles

Re: Starting Out in SMT

by adafruit_support_mike on Wed May 29, 2013 6:49 pm

'SMD' stands for 'Surface Mount Device' and 'SMT' stands for 'Surface Mount Technology'. They're synonyms, and refer to all those tiny block-like components that are used instead of 'Through-Hole' components with leads that stick through holes in the PCB:

pcb-small.jpg
This is a current source, not an LED board. It uses SMT components though.
pcb-small.jpg (65.84 KiB) Viewed 2435 times


The LED boards let you connect LEDs to a circuit "for free". In most cases, when you add an LED to a circuit you also have to add a resistor to limit the current, and you have to make sure that part of the circuit can supply the 10-25mA of current necessary to make the LED work. If you want to use an LED with a signal that can't supply a lot of current, you have to bring in a transistor and all the stuff necessary to make that work too.

The LED board puts all those pieces in one place. The LEDs already have resistors, and are driven by mosfets that can supply enough current to run the LED without having any noticable effect on the original circuit. Adding an LED to a circuit becomes as easy as "plug in the control wire".

It's also a space saver. An LED and resistor fill at least two rows of a breadboard. Adding a transistor takes the row count up to at least four. By the time you put half a dozen LEDs in a circuit, you've used up a lot of breadboard space. Moving all the LED hardware off to a separate board leaves you more breadboard space for circuits that do interesting stuff.
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

adafruit_support_mike
 
Posts: 45167
Joined: Thu Feb 11, 2010 2:51 pm

Re: Starting Out in SMT

by terryd1 on Wed Apr 09, 2014 2:29 pm

Hi Mike,

This is long overdue, but THANKS!!. I have been ill for quite a while and unable to do much and I guess my wife has been busy looking after me in that time but she is now able to try her hand at SMT so she was very happy when I told her I could download the files from the links you posted. (Still can't access the server by the way)

She will enjoy, I am sure.

Thanks again.

Terry

terryd1
 
Posts: 6
Joined: Tue Jan 01, 2013 5:15 am

Re: Starting Out in SMT

by phild13 on Wed Apr 30, 2014 12:36 am

It appears the server is back up at this time
http://info.yawp.com/blog/2012/36/smt-t ... index.html

phild13
 
Posts: 247
Joined: Mon Sep 10, 2012 1:05 pm

Re: Starting Out in SMT

by nsayer on Fri Jun 13, 2014 6:53 pm

If you're looking for inspiration, I would just page through the OSHPark shared projects page(s): https://oshpark.com/shared_projects

They're mostly not documented very well, but most of them have descriptive titles at least that make for good Google fodder.

nsayer
 
Posts: 58
Joined: Thu Aug 08, 2013 10:45 am

Re: Starting Out in SMT

by brigad on Fri Dec 12, 2014 2:25 pm

I am looking at using a 3-axis accelerometer in a project. Looks like all the ones I want are LGA-14. I've tried two approaches: soldering superfine wire-wra
pping conductors directly to the pads, and using an LGA-14 breakout board I found. I'm testing the "hairy" solution in an hour or so and the breakout board, well it's hard to see but under the microscope I doubt I got the solder to flow to the pads. I'll test it later.

This is just to evaluate the things. I created an LGA-14 landing map in my PCB tool and hope to actually build 4-10 of these things if it works, and so I need to be confident that I can place this one, most challenging part reliably once I get the boards back.

Any experience with LGA patterns that anyone can share?

Thanks,
-wt

brigad
 
Posts: 2
Joined: Fri Dec 12, 2014 2:00 pm

Please be positive and constructive with your questions and comments.