I forgot to follow up and mention that the video was completed some time ago and is available on my website. I'm interested in hearing if the video was informational/useful to anyone. Bill, I hope the video helps you sell some product. Take care.
Thanks. I could use the redirect, however, in all fairness if you want to embed the video (in a more permanent form) you can go directly to the video itself at the link below on my YouTube channel. You should be able to get a direct embedding link. Take care.
Kaoskidd, yes, I am working on a complete write up of the demo that I did at UPEW. I have been really swamped lately so I am behind. Here's a super-short overview:
using putty knife, spread the bead of paste across the PCB apertures using enough pressure so that almost no paste is left across the surface. (ensures that paste is forced into the apertures, but also that the putty knife does not scoop into the aperture)
lift stencil up slowly, if the board sticks, tap the stencil to drop it off.
check paste print
use tweezers to place parts onto paste; give each a slight push to "stick" into the paste.
place boards on metal tray into room temp toaster oven
set toaster oven to 350+ and turn on
monitor temp of candy thermometer/thermocouple while watching for paste to reflow.
once paste reflows, leave oven on for about 20 seconds
turn off oven, wait 15 seconds
open oven door, wait 1 minute
pull tray from oven and set away from oven (away from heat)
once at room temp remove from tray
check for shorts on input and both outputs
test by applying 9 volt in and checking for 5.0 +/-0.1 on 5v output and 3.3 +/- 0.1 on 3.3v output
place into ESD bag with DC jack and 6 header pins
apply 1x3 product label on ESD bag
sell a lot and retire.........
That's how it all works. (well, I am still working on that final step)
Kaoskidd, yes, I am working on a complete write up of the demo that I did at UPEW. I have been really swamped lately so I am behind. Here's a super-short overview:
using putty knife, spread the bead of paste across the PCB apertures using enough pressure so that almost no paste is left across the surface. (ensures that paste is forced into the apertures, but also that the putty knife does not scoop into the aperture)
lift stencil up slowly, if the board sticks, tap the stencil to drop it off.
check paste print
use tweezers to place parts onto paste; give each a slight push to "stick" into the paste.
place boards on metal tray into room temp toaster oven
set toaster oven to 350+ and turn on
monitor temp of candy thermometer/thermocouple while watching for paste to reflow.
once paste reflows, leave oven on for about 20 seconds
turn off oven, wait 15 seconds
open oven door, wait 1 minute
pull tray from oven and set away from oven (away from heat)
once at room temp remove from tray
check for shorts on input and both outputs
test by applying 9 volt in and checking for 5.0 +/-0.1 on 5v output and 3.3 +/- 0.1 on 3.3v output
place into ESD bag with DC jack and 6 header pins
apply 1x3 product label on ESD bag
sell a lot and retire.........
That's how it all works. (well, I am still working on that final step)
Sweet...
I'm going to try this once I get to that point. My manual soldering skills leave LOTS to be asked for...
Comments
Thanks. I could use the redirect, however, in all fairness if you want to embed the video (in a more permanent form) you can go directly to the video itself at the link below on my YouTube channel. You should be able to get a direct embedding link. Take care.
Savage Circuits Episode 8 on YouTube
Tools:
- tin-lead, no-clean solder paste
- 6 mil stainless steel stencil
- plastic "putty knife" as the squeegee
- ESD mat as the screening surface
- alcohol wipes for cleanup
- divided parts bin for components
- tweezers for placement of parts
- $40 "heating element" style (not IR) toaster oven (think it's a Magic Chef)
- Small metal "cookie sheet" to place boards on
- oven mitt
- Candy thermometer
- Fluke 377 with thermocouple
Process:That's how it all works. (well, I am still working on that final step)
Sweet...
I'm going to try this once I get to that point. My manual soldering skills leave LOTS to be asked for...