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This infrared transmitter can be used with this infrared receiver. This transmitter uses impulse modulation. The modulated signal is produced by comparison of an audio signal with a triangle signal of high frequency using a comparator IC. An appropriate triangle signal generator must have the offset equal with half of the 5V power supply voltage and the triangular signal size is 2.5V. Check out the infrared alarm circuit too.
This infrared receiver is used with this infrared transmitter. The output signal of D1 IR diode is amplified by IC1. The diode is BPW41N works great with the transmitter and is relatively fast (~200 ns). The impulses at IC1′s output are applied to IC2 (comparator) that separate them from ambient light. Check out the infrared alarm circuit too.
