View Single Post
  #30   Report Post  
Posted to alt.binaries.schematics.electronic
Jim Thompson Jim Thompson is offline
external usenet poster
 
Posts: 2,221
Default 8-layer board, about 1050 parts - V470.jpg - V470snap.jpg

On Mon, 4 Jun 2007 19:38:25 -0400, "Tom Del Rosso"
wrote:

"Michael A. Terrell" wrote in message


Was it just one bad via on one board, or a whole bad batch? Philco
had a factory in Mexico that had lots of problems with consumer
electronics, and Delco made a MAJOR design mistake when they used
"Griplets" instead of plated through holes in a series of car radios.


What makes eyelets or griplets so much less reliable? Expansion? I don't
see a reason why they should break more than a connection to a lead does.

Of course they have the disadvantage of only connecting outer layers.


Back in my discrete days I used copper eyelets for connecting large
gauge high current wires.

The military balk because the solder _under_ the eyelet can't be
inspected.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

America: Land of the Free, Because of the Brave