Function Generator Circuit

admin February 23, 2011 21 Comments

Function Generator Circuit

Description.

The ICL8038 is a function generator chip, capable of generating triangular, square , sine, pulse and sawtooth waveforms . From these sine, square & triangular wave forms can be made simultaneously.There is an option to control the parameters like frequency,duty cycle and distortion of these functions.This is the best function generator circuit for a beginner to start with and is of course a must on the work bench of an electronics hobbyist.The circuit here is designed to produce waveforms from 20Hz to 20 kHz.The ICL 8038 has to be operated from a dual power supply.

Function Generator Circuit Diagram & Parts List.

Pulse Generator or Waveform Generator Circuit

Function Generator Circuit Diagram

Notes .

  • The circuit needs a dual power supply. A +15 -15 power supply as shown in the circuit is enough for the purpose.
  • The frequency of the output wave form can be adjusted using R7.It must be a 100K Log POT.
  • The duty cycle can be adjusted using R3 , a 1K POT.
  • The distortion of the wave form can be adjusted using R5 , a 100K POT.
  • Square,triangle & sine waveforms can be obtained simultaneously at pins 9,3,2 respectively.

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Comments
  • zain
    November 8, 2016

    what if we want to add lcd display as well?

  • vishal
    November 5, 2014

    can we can use diode in4007?

  • October 6, 2013

    how can we increase the range so that it operates from 0Hz to 200Khz??
    yhnx

  • naomi
    August 29, 2013

    please tell us the substitute diode for 1N457 and its working in this ckt.
    can we use 1N914A

  • Justus
    August 13, 2012

    Can this circuit produce a triangular wave 100v (-50v to +50v)that is 50v peak to peak?

  • May 27, 2012

    We want an improved vasion of this diagram which will be controled by a computer system.

  • Heggi
    April 17, 2012

    how to change this circuit to be able to make 25kHz ?
    I’ve look through ICL8038 datasheet, and it says it is able to generate up to 100 kHz, but I can’t find how to determine the frequency

    Thanks

  • Emeka
    October 17, 2011

    Nice learning about this circuit. Was actually searching for a veractor circuit. Found it and found this

  • saad
    October 16, 2011

    salo koi sasta sa tarika nhe bta sktey????????

  • ejcab7
    October 12, 2011

    hello mr. SEETHARAMAN

    im trying to build this circuit. are you saying that i have to put a 10uF cap before the +V and -V? so thats 2 caps? and what is the 0.1 disc?

    thanks. i was the amplifier noob dude you helped. 🙂

  • seetharaman
    July 20, 2011

    Hi Mr Faisal is correct it important that you decouple power supply both positive and negative at the IC end to common with 10uF and a 0.1 disc (one set for positive supply and one set for negative supply).

  • Faisal shehzad
    July 20, 2011

    This circuit works.But you should use two capacitors of 10uf(polar) and connect one capacitor with V+(positive leg of capacitor) and second capacitor with V-(negative leg of capacitor) and remaining two terminals of capacitor should ground.Then this circuit will work.Don’t use this circuit as it if u use then your IC will be damage.

    • rizwan
      May 12, 2015

      the dual power supply is AC or DC?

  • suraj
    November 6, 2010

    please send me working and associated circuitary of wave form generator

  • SYED FURQAN ALI
    April 18, 2010

    hi
    will you plz send me list of all components of this circuit
    (unction generator)?

  • September 30, 2009

    PLEASE SEND ME A TWO FREQUENCY SQUARE WAVE FUNCTION GENERATOR CIRCUIT DIAGRAM TO MY MAIL.

  • SUJAY MAITRA
    April 18, 2009

    we have required walkthrough metal detector circuit .

  • nunzilla555
    April 4, 2009

    could you please post a link where i can buy a couple of the 8038 chips

  • silent-core
    February 18, 2009

    any chance for showing us the output waveforms??? Thanx for the circuit, btw.

  • Alok Ghildiyal
    December 21, 2008

    please send me working and associated circuitary of wave form generator

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