N2PK VNA

From Note to self
Revision as of 00:08, 16 October 2013 by Hansvi (Talk | contribs) (→‎Missing)

Jump to: navigation, search

Documentation

Notes

Components

Missing

Bottom side

  • R160a - R166a: I used 270k instead of 220k
  • C115-117,126,127: 10uF 16V X5R 1210
  • C180-C184
  • C170-C174
  • R250: 3.3R 5% 0805 - I have 1.8R, 3.9R
  • C250, 280,281,292: 10uF 16V Tant 20%
  • C213, C290 100nF X7R
  • C280,281,292

Questions

  • All caps seem to be NPO, X7R, X5R, or Tant. NPO = temperature independant, X7R & X5R = ceramic, Tant = tantalum. Problem: I only have an assortment, no other specs (prob. ceramic?)...
  • R160a - R166a should be 221K. They are part of (what I assume to be) an RC filter, and a load for that filter (the input impedance of that buffer IC is probably quite high). These are digital lines. I don't have those values, so I was thinking about taking 1k2/75pF for the RC filter, and 270k for the load. I don't see why it should be very critical.
Retrieved from "http://hansvi.be/mediawiki/index.php?title=N2PK_VNA&oldid=32"