Capacitor identification.

Discussion in 'General Electronics Chat' started by talisman, Jan 19, 2007.

  1. talisman

    Thread Starter New Member

    Jan 19, 2007
    5
    0
    A circuit from Europe gives capacitor values for two capacitors as
    10M
    180
    with no identifying symbols such as pf or uf .
    I cannot find a reference to this method of specifying capacitor sizes.
    Can someone please advise the size in pf or uf of these two capacitors.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    The 180 is likely in picofarads - that's a standard value. Without seeing the circuit, though, any interpretation is going to be a guess. Can you post it up?
     
  3. talisman

    Thread Starter New Member

    Jan 19, 2007
    5
    0
    Thanks Beenthere. Dont know how to bring circuit onto this page.
    I will work at it and add it when I sort it out.
     
  4. talisman

    Thread Starter New Member

    Jan 19, 2007
    5
    0
    Hope this works !!!
    The circuit is to modify the input to a sound card oscilloscope so that it will display square pulses as square and not as RC spikes.
    Not knowledgeable in this area but presume it holds the output up until the input drops rather than having the output decay with time. And not much time either, about 2 ms is the limit for a square pulse without this mod..
     
  5. talisman

    Thread Starter New Member

    Jan 19, 2007
    5
    0
    It didn't !!!! File too big !!! ScreenShot001.jpg
    So here goes again.
     
  6. wireaddict

    Senior Member

    Nov 1, 2006
    133
    0
    The 180 and 10M next to the caps almost certainly mean picofarads here; a larger cap by the input would shunt too much signal to ground. Also, the caps on the +/- 5 V supply aren't critical and are typically 0.1 uF, and the one by the balance control I think is 10 uF.
     
  7. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,279
    1,069
    Are you using a x10 probe?
     
  8. talisman

    Thread Starter New Member

    Jan 19, 2007
    5
    0
    Joe
    PROBE ???? what probe
    This is a poor mans 'scope . We cannot afford a probe.
    Using stranded, shielded audio wire.

    Thanks Wire addict. I will wait for possibly further input then try them all and report back.
    I really appreciate the quick responses. This is my first time on a Forum and I'm impressed !!!!
     
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