Design and implementation of a new infrared transmitter and receiver

Infrared communication is the main mode of short distance communication and has been widely used for point to point data transmission. The main drawback of infrared communication is that the signal is very weak and there are certain requirements for firing angle. According to these disadvantages, this design of transmitter circuit has used three stage amplifiers in order to amplify the initialization audio signal to drive the emission heads work normally, and also two emission heads are used to ensure sufficient strength of transmitted signal. Optical receiver employs a two stage amplifying circuit and some filter circuits to ensure the receiving signal can be detected normally.