Although the
human eye is unable
to detect infrared
light, this Kind of light
is emitted by many
apparatus around us
in everyday life. In a
number of cases it
may be useful or interesting
to be able to
detect and prove the
presence of infrared
light. The present circuit
is perfect for that
purpose. It is based
on a special integrated
circuit which
contains an IR irradiance
to frequency
converter. In other
words, the converter's
output frequency
provides an
indication of the measured
light intensity. A
very handy and simple
circuit!
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