Infrared Detector Circuit

Infrared Detector Circuit

Wednesday, May 30th, 2018 - Sensor/Detection Circuit

The infrared detector circuit is used to detect the infrared light beam. To detect the infrared light beam used in the form of photo transistor sensor. The infrared detector circuit has an output path which can be connected to a buzzer, LED or relay. The infrared detector circuit is created using a photo transistor type TIL78, a NAND Gate CD4011 CMOS IC and a transistor as a driver for a load connected to the circuit’s infrared detectors. Schematic drawings and the value or type of components used to make the infrared detector circuit can be seen in the following figure.

Infrared Detector Circuit

Infrared Detector Circuit

Infrared detector circuit in the image above can be supplied by a DC voltage of +5 volts to +15 volts or adjusted to the load connected to the infrared detector circuit is.

Working Principle Infrared Detector Circuit

In principle, work system infrared detector circuit is as follows, in the absence of infrared light received by photo transistor, the NAND gate first (pin 1 2 3) gets input LOW so that the NPN transistor TIP31 not getting biased and the load connected to the infrared detector circuit is OFF. Then when the photo transistor receiving the emitted infrared light, the NAND gate first (pin 1 2 3) will receive input HIGH so that the NPN transistor TIP 31 gets biased through NAND gate to another, so that the transistor TIP31 will be active and provide a voltage source to a load connected to the infrared detector circuit is.

If the infrared detector circuit is used to power LED then need to be concerned given the maximum current to the LED, and therefore can be mounted to the LED current-limiting resistor in series with the LED and the infrared detector circuit.

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