alias

alias ai=’sudo apt-get install‘
alias c=’clear‘
alias d=’ls /dev‘
alias e=’cd /etc/ ; ls‘
alias grep=’grep –colour=auto‘
alias l=’ls –color -ha –group-directories-first‘
alias ll=’ls –color -hal –group-directories-first‘
alias ls=’ls –color -h –group-directories-first‘
alias p=’python3′
alias pp=’cd /home/user/python/HIDpython ; ls‘
alias u=’lsusb ; echo; echo „Number of USB-Devices:“ ; lsusb | wc -l ;echo; echo /dev/ttyUSB* ; echo‘
alias x=’exit‘

PCB Design

OSHPark Tolerance Test

http://blog.kevmod.com/2014/07/playing-with-osh-park-tolerances/

PCB-Limits 2016-12

OSHPARK

Two Layer Boards:

FR4 substrate, purple mask over bare copper, and ENIG (immersion gold) finish.
6/6 mil clearance/trace width
13mil drill size, 7mil annular ring (min Via 27mil)

Four Layer Boards:

FR408 substrate, purple mask over bare copper, and ENIG (immersion gold) finish.
5/5 mil  clearance/trace width
10mil drill size, 4mil annular ring (min Via 18mil)
Maximum soldermask expansion is 2.5mil.

PCB-Pool  1-4 Layer Boards:
6/6 mil clearance/trace width  (for extra money  5/5mil )
Stopplack > 0,15 mm (6mil)
12mil (0,3mm) drill size  (for extra money 8mil, 0,2mm)
6mil / 0,15 mm   annular ring   (for extra money 5mil / 0,125 mm)
Via 24mil (for extra money 18mil)