Friday, May 25, 2012

ODB++

"ODB++ is a printed circuit board manufacturing database originally developed by Valor. It was created to try to bring some order to the transfer of board data from the designers to the manufacturer. Because Valor also provides the dominant CAM tool to manfacturers the company was able to get the major industry players to adopt their proprietary standard. In recent years ODB++ has become more open after attempts by the IPC were made to replace it."

"The great majority of PCB design software (layout) can output a valid and correct ODB++ file. A free ODB++ viewer can be obtained from Valor (Frontline) that allows one to visualize the data."

Thursday, May 17, 2012

PCB Mounting Holes - Tom Hausherr's Blog

Wednesday, May 16, 2012

Surface Mount Jumpers and Test Points

Surface mount jumpers can be used to solve low layer count routing or serve as high current zero ohm jumpers, 0805 and 1206 sizes are available.



Components Corporation  
SMT Jumper - SJ Series Surface Mount Preform Jumper | Components Corp

Harwin also makes as large selection of surface mount clips and jumpers .

High-Voltage PCBs - Dieletric Strength


Dielectric Strength must be considered for High Voltage Designs.

You may find dielectric strength specified in KV/Meters. However since PCBs are consider thinner than a meter we need to reduce the specification to mils (thousands of an inch) or Milli-meters (metric).








So:





A spec of 30KV/meter = 76V/mil for Dry Air.

Humidity must all so be considered,  the dry air calculation should to be derated.



High-Voltage-PCDesign.pdf (application/pdf Object)

Monday, May 7, 2012

Hardware for PCBs

Surface Mount TPs, Jumpers, Shield Clips

Harwin EZ-BoardWare  Surface mount solutions for Test points and Jumpers.


Plastic Mounting Standoffs

Richco-Inc.  Large Array of Plastic Hardware Solutions (standoffs and much more).


Shields

Bi-Link Shields and Metal Stamping
Orbel Board Shields