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Hi everybody,
Below is the internal diagram of my IR receiver unit which i intend to use in my project for proximity detection. Can anybody spare some time and explain me why each of the components are used and what is their purpose. Thanks,
Surya 8)
The light source is chopped at some frequency which produces pulses at the optical receiver. The limiter is just a high gain amplifier that clips the output at the maximum level. The bandpass filter passes the frequency of the chopped light and rejects other frequencies. The demodulator is a rectifier that outputs DC. The integrator charges it's capacitor with the DC signal, and if the signal lasts long enuf, turns on the output transistor. If the signal does not last long enuf, the transistor is not turned on.
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