Circuit Description

Here is the circuit diagram of common function generator circuit. The central part of this circuit is the function generator IC ICL 8038. This function generator IC can generate waveforms such as sine, square and triangular at the same time. This IC has got an added feature that it can control the waveform parameters such as frequency, duty cycle and distortion. The frequency of the output waveform is adjusted using potentiometer R7 (100K). The potentiometer R3 (1K) is used for adjusting the duty cycle of the waveforms. Adjustments in distortion of the waveforms are accomplished by the potentiometer R5 (100K). This circuit is designed to produce waveforms with frequency range between 20Hz and 20 kHz. The function generator IC requires dual DC power supply. A dual power supply of -15/+15 as shown in the circuit is used here for powering this circuit.

Circuit Diagram

Simple Function Generator Circuit

Simple Function Generator Circuit


  • Use a good quality PCB to assemble this circuit.
  • 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.
  • Square, triangle and sine waveforms are obtained simultaneously from pins 9, 3, 2 respectively of the function generator IC.