xr2206 with dual supply?

Discussion in 'The Projects Forum' started by onlyvinod56, Mar 24, 2009.

  1. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    hello,
    i found two circuits for function generator with xr2206.
    one uses +Vcc, 0V &
    the other uses +Vcc 0V -Vcc.
    what will be the difference in the output waveforms?
    Is there any difference in the symmetry?
     
  2. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    I need three triangular waves.each having same p-p values.let it be
    3Vp-p.
    one triangular wave: 0V (min) 3V(max)
    second tringlar : -3V(min) 0V(max)
    third tringlar : -1.5V(min) +1.5V(max)

    I can use three XR2206 ICs.
    Can i get these outputs with single power supply?
     
  3. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    Do you really need three separate triangular waves?

    If they have to be of different frequency then you need three generators. However if they need to be of the same frequency (and phase) there is much to be said of using a single generator and creating the different waves you need with a generator and three level shifters. They will then be of exactly the same frequency and in phase, something difficult to achieve with separate generators.

    Google 'level shifter' there are lots of examples.

    There are also easier (cheaper) ways to generate triangles than an XR2206.
     
  4. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    i need three different signals with different frequencies
     
  5. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    Hello everyone.
    As a part of my project i need two sinusoidal signals with same frequency and same phase angles. but the offset values should be different. the same xr2206 iam using.

    from the previous post, i came to know that a level shifter / clamper can do this job.

    I surfed over the net. i didnt find satisfactory circuits. can anybody forward me a link of simple level shifter / clamper?
     
  6. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    362
    1
    hello.
    its urgent. How can i vary the DC offset of the output of xr2206?
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
  8. nucleargungus

    Member

    Apr 6, 2009
    23
    1
    I bought the xr2206 in kit form to learn more about electronics. (I recently found a free o-scope on craigslist) I wanted a function generator to learn more about basic transistor amplifiers, passive components etc. But it biases everything I've tried to hook it to LM741, push-pull, etc. Could this be powered by a dual supply to offset the 4.5vdc dc offset created (im guessing here) by the voltage divider setup?

    Robert

    http://www.techedu.com/pdf/elenco/fg-500k.pdf (see page 16 for schematic)
     
  9. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The project is missing an output coupling capacitor so its output has DC on it.
    An output coupling capacitor will pass the AC signal but will block the DC.
     
  10. nucleargungus

    Member

    Apr 6, 2009
    23
    1
    Thanks... I actually figured that out. Thats by far the simplest way to eliminate that DC offset. I really appreciate the help thank you so much.

    Robert
     
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