Simple function generator circuit

Last Update Time: 2018-12-27 11:22:15

This article describes the Simple function generator circuit

Four opamps (2 from each IC) is used in the function generator circuit. First opamp IC 1a is wired as an astable multivibrator.R1 is the feedback resistor and C1 is the timing capacitor output of IC 1a is feed back to its non inverting input (pin 3) from the junction of R3 & R2.The output of IC 1a will be a square wave and its frequency can be varied by varying R1 or C1.

The next opamp IC 1b is wired as an integrator.R5 is the feedback resistor and C2 is the integrating capacitor. Non inverting input of IC 1b (pin6) is tied to ground using resistor R7. The output of IC 1a which is a square wave is applied to the inverting input of IC 1b (pin 5) through R4 which is the input resistance of IC 1b.The output of IC 1b will be a triangular wave form, because integrating a square wave will result in a triangular waveform.

IC 2a forms another integrator, where R11 is its feedback resistor and C3 is the integrating capacitor.R6 is the input resistance of IC 2a. Non inverting input of IC 2a (pin 3) is tied to ground using the 10K resistor R8. IC 2b forms an inverting amplifier where R9 is its input resistor and R10 the feedback resistor. With the used values of R10 & R9, the gain of the inverting amplifier stage will be 27, (AV = -Rf/Rin). The triangular output waveform from the IC 1b is further integrated using IC 2a inverter using IC 2b circuit diagram.

This article is from Allicdata Electronics Limited

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