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Re: Constants you cannot help but remember

by toma (Vicar)
on Jun 09, 2004 at 05:05 UTC ( #362621=note: print w/ replies, xml ) Need Help??


in reply to Constants you cannot help but remember

Here's some from my EE role:

  • The 1% resistor values closest to the 5% resistor series
  • The 5% capacitor series
  • 2.54
  • 3.14159
  • 2.71828
  • 159kHz ~ 1M Radian/sec, where 1mH = j1k and 1uF = -j1
  • Way too many component specifications, such as 2N2222A Betamin = 100
  • An arcane corporate part-numbering scheme that dates back to microfilm and punch cards.

It should work perfectly the first time! - toma


Comment on Re: Constants you cannot help but remember
more EE constants
by sleepingsquirrel (Hermit) on Jun 10, 2004 at 23:25 UTC
    And those with an affinifity for BJT IC design

    25ohms (re @ 1mA Ic)
    -2mV/C (Vbe tempco)
    1.21V (band-gap voltage)
    25mV (thermal voltage)
    0.35 (converting BW to rise time and back)
    99.7% (3 sigma)

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