3 signals thru 1 probe to a C.R.O

Discussion in 'General Electronics Chat' started by itsmyturn, Feb 15, 2005.

  1. itsmyturn

    Thread Starter Member

    Feb 15, 2005
    16
    0
    HELLO ANYBODY !!!!!!!!!!!!!!!!!!!!

    I HAVE TO SHOW 3 SINUSOIDAL SIGNALS ( CLAMPED TO DIFFERENT D.C LEVELS) SIMULTANEOUSLY ON A C.R.O USING A SINGLE PROBE. HOW CAN I MAKE IT POSSIBLE.



    SECONDLY HOW CAN I GENERATE AN EXACT PHASE DIFFERENCE OF 90 DEGREES.
     
  2. 1000MFD

    New Member

    Dec 5, 2004
    4
    0
    If cross-coupling back from the load is not an issue, you can make an analog "AND" using resistors (90Kohms/10Kohms for illustration, you may choose lower resistance, just make all three the same if they are 'nominally' in the same voltage range)... The 90Kohms/10Kohms makes a 10:1 voltage divider.

    AC1 --- 90Kohms -----
    `````````````````|
    AC2 --- 90Kohms ------------------------ C.R.O. high impedance input
    `````````````````|`````````|
    AC3 --- 90Kohms -----`````10Kohms
    ```````````````````````````|
    Common (gnd) ----------------------------- C.R.O. signal ground

    For your second question, tis an exercise.... keep in mind the phase will be frequency-dependent ifyou choose to use a passive circuit. Good luck with your homework.
     
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