How to change duty cycle in voltage to frequency converter using LM331

Discussion in 'General Electronics Chat' started by Amol Sakhale, Jul 1, 2015.

  1. Amol Sakhale

    Thread Starter New Member

    Jun 12, 2015
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    How to change duty cycle in voltage to frequency converter using LM331???
     
  2. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Your question does not contain any information, so it can not be answered. You told us nothing about your application. What signal voltage, waveform, amplitude, frequency range, output voltage range - nothing.

    Read the datasheet. It has seven circuit designs for different applications and the design equations you need. Pick the one that is closest to your application, modify it to suit your needs, and post the schematic so we can see your work. Then ask questions.

    ak
     
  3. crutschow

    Expert

    Mar 14, 2008
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    That circuit does not appear to readily allow adjustment of the output duty-cycle.
    Why do you want to?
     
  4. ian field

    Distinguished Member

    Oct 27, 2012
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    This device was popular in the early SVGA and multisync monitors, as it can be configured as voltage to frequency or frequency to voltage, so it was used as part of the VGA mode detection from the sync pulse frequency. Monitor schematics from that era are likely to show various ways of connecting this chip.

    There were Sharp and Raytheon pin for pin equivalents, but the numbers don't suggest it - so it can take a bit of detective work and a few equivalents charts.
     
  5. ian field

    Distinguished Member

    Oct 27, 2012
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  6. ian field

    Distinguished Member

    Oct 27, 2012
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  7. crutschow

    Expert

    Mar 14, 2008
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    Why are we looking for equivalents of the LM331?
     
  8. ian field

    Distinguished Member

    Oct 27, 2012
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    More different numbers for the same chip to look for appnotes under.
     
    RichardO likes this.
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