vco configurations

Discussion in 'General Electronics Chat' started by spark8217, Mar 12, 2012.

  1. spark8217

    Thread Starter Member

    Aug 29, 2011
    64
    2
    hi guys
    trying to build a vco with op amps that operates 0- 5khz with input voltage range from 0-6 volts and ramp voltage of + to - 4 v , would appreciate some guidance on where i am going wrong ! i have attached the schematic below , im un sure whether the op is correct for the job i have changed with limited success !! , im upon the understanding the zeners on the bottom of a2 control the voltage and the capacitor controls the frequency which is above a1 , and
    A1= summing amplifier
    A2= voltage comparator
    A3= inverting summing amplifier

    i hope some one can lend a hand
    cheers !!
     
    Last edited: Mar 12, 2012
  2. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    The datasheet for the LM358 and LM324 shows a VCO.
     
  3. spark8217

    Thread Starter Member

    Aug 29, 2011
    64
    2
    thanks for that !!!
     
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