Oscilloscope trace doubler. Real or magic?

Discussion in 'Electronics Resources' started by Insertname, Sep 12, 2011.

  1. Insertname

    Thread Starter New Member

    Mar 15, 2011
    12
    0
    Hi,

    has anyone come across this beauty before? The basic idea behind it is to use a single input of an oscilloscope and display two waveforms with it from two separate inputs.

    http://www.vk6fh.com/vk6fh/tracedouble.htm

    The only other source I've seen for this is Newnes passive and discrete circuits by R.M. Marston on p. 167. This can be viewed on Google Books.


    Thanks again for any input. This seems like it would be very handy for cheap DIY work.
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    The circuit is well known.
    As the chopping frequency is only 30 kHz, the signals upto 3 kHz will be shown rather well.

    Most circuits use a much higher chopping frequency and make use of "alternate" for higher frequencies.

    Bertus
     
  3. lightingman

    Senior Member

    Apr 19, 2007
    374
    22
    Yep.

    Thandar did an eight way scope expander and a storage unit to go with the SC110.

    Daniel.
     
  4. Insertname

    Thread Starter New Member

    Mar 15, 2011
    12
    0
    Excellent, thanks guys. A few more questions

    Presumably, the 2 inputs you have can only have half the frequency of the main oscillator?


    What's an eight way oscilloscope expander? It sounds interesting :)
     
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