![]() The LM339 chip is powered by connecting Vcc (pin#3) to 5V while the GND pin (pin#12) is grounded. The non-inverting terminal of each op amplifier is given power of +2V. One terminal of potentiometer connects to GRND and the other to Vcc. The inverting terminal of each op amplifier is connected with wiper terminals of potentiometer. Here in this circuit four LEDs with different colors are to demonstrate the four op amplifiers at the same time. ![]() The schematic circuit diagram for LM339 quad voltage comparator is shown below: LM339 Quad Voltage Comparator Circuit Diagram: One of them is Vcc and the other is grounded. ![]() The output is drawn to Vcc if the inverting voltage is higher than the non-inverting and the output is drawn to ground for the opposite case.Īpart from the output and input pins, two pins of LM339 are power pins. ![]() Now if the output is applied to an LED, the LED will be ON in the first case (inverting >non-inverting) while OFF in the second case (non-inverting > inverting).Įach of the four op amp has 3 pins, two of which are input pins, to be compared, while the third one is output pin whose value is dependent on the inputs’ comparison. In case when non-inverting input is greater than the output voltage is drawn high to Vcc. The output is drawn to ground in case when the inverting input is greater than non-inverting input voltage. Each operational amplifier of a comparator have two inputs. LM339 Quad Voltage Comparator working is very simple. ![]() LM393 Working of LM339 Quad Voltage Comparator: ![]()
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