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Looked everywhere, but never seen this chem symbol before, plz help

Discussion in 'High Voltage' started by corbin, Jul 27, 2014.

  1. corbin

    corbin New Member

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    can anyone help me with this, sorry for being so naive, but in this schem. ( http://mujweb.cz/jmartis/qrv4_en_final.png ) what electrical component is located off of pin 4 of the UC that almost looks exactly like a variable resistor. Also, all the capacitor labeling is odd too, 3n3? And if anyone knows a webpage or something that has every symbol on it for everything that would be wonderful! thank you! :)
     
    Last edited: Jul 27, 2014
  2. ronsimpson

    ronsimpson Well-Known Member Most Helpful Member

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    There is a "pot" variable resistor labeled "power limited set".
    There another pot labeled "f" for frequency. It sets the frequency.
    3n3=3.3nF (.) Is hard to see and sometimes does not make it through a copy machine. That is why .1uf is often written 0.1uf.

    3R3=3.3 ohms
    33R=33 ohms
    3k3=3.3k ohms

    I like the idea of using other than a period. R, C, K, M, ..........
     
  3. magvitron

    magvitron Active Member

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    Yeah its a convention 3n3 looks much better to read than 3.3 in computer screen too ron. It reduces errors.
     
  4. dave

    Dave New Member

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  5. picbits

    picbits Well-Known Member

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    I've always viewed those pot symbols (the one with f on it) as a trimmer rather than a conventional potentiometer.
     
  6. Nigel Goodwin

    Nigel Goodwin Super Moderator Most Helpful Member

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    That's because it IS a trimmer :D

    A normal variable resistor has an arrow, as in the one above labelled 'power limit set', the 'f' of course stands for frequency.

    The 3n3 etc. is the international preferred way of giving component values, and makes much more sense than '.'
     
  7. Ian Rogers

    Ian Rogers Super Moderator Most Helpful Member

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    Same here the bar at the top of the center connector denotes "preset trimmer"
     

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