Function Generator Circuit

Function Generator Circuit


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.

We have more Measurement Circuits that you may like to visit;Take a look below:

1. LED Thermometer

2. Water Level Indicator

3. Sound Level Meter

4. Voltmeter Circuit

5. Audio Distortion Meter

Show Comments

20 thoughts on “Function Generator Circuit

  1. Heggi

    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


  2. ejcab7

    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. :)

  3. seetharaman

    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).

  4. Faisal shehzad

    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.


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>