HELP! reading schematics

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Discussion in 'The Projects Forum' started by lancellot07, Jul 16, 2012.

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  1. Jul 16, 2012 #1
    lancellot07

    Thread Starter New Member

    Jul 2, 2012
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    anobody who could help me how to read the schematics. im still a beginner in electronics... there's an attached pic of a schematic ive seen somwere and i dont know the small circles on some of the pins..and other additional questions is on the pic... could you tell me those symbols? thanks in advance..
     
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  2. Jul 16, 2012 #2
    MrChips

    Moderator

    Oct 2, 2009
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    The circles mean the signals are NEGATIVE LOGIC, i.e. it requires a LOW to activate that function.

    K1a etc are most likely connections to a terminal block.

    P1 is a trim pot to preset the frequency of IC1A.

    P2 is the main adjustment for the pulse width of IC1B.

    P3 is a trim adjustment to set the min or max of IC1B.
     
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  3. Jul 16, 2012 #3
    panic mode

    Senior Member

    Oct 10, 2011
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    when circle or bubble is touching envelope of the device (box or whatever representing device) then it means that logic is negative (inverted / lookup logic gate NOT).

    when it is on the wire (not touching envelope of the device), it is just terminal or connection.
     
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  4. Jul 16, 2012 #4
    lancellot07

    Thread Starter New Member

    Jul 2, 2012
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    meaning ill just connect a wire from pin 10 to ground that will pass through R7.. and pin 4 to ground? am i correct?
     
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  5. Jul 16, 2012 #5
    panic mode

    Senior Member

    Oct 10, 2011
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    you can ignore bubbles, just wire as if they were not there. so pin 10 of the IC goes to R7 and S2 for example.

    P2 connects to +12V, R9 and P3.

    motor connects to +17V and T2.

    etc.
     
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  6. Jul 16, 2012 #6
    DickCappels

    Moderator

    Aug 21, 2008
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    You have so many diverse replies, some from people who might not have inspected the attached drawing, so I feel one more vote is a good idea.

    As panic mode said, you can ignore the bubbles. They indicated attachment points for some components. In a classic schematic, they would not exist.
     
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