IR Remote Control Tester
Notes:
As I was developing my IR Extender Circuit, I needed to find
a way of measuring the relative intensities of different Infra red light
sources. This circuit is the result of my research. I have used a photodiode,
SFH2030 as an infra red sensor. A MOSFET opamp,
CA3140 is used in the differential mode to amplify the pulses of current from
the photodiode. LED1 is an ordinary coloured led
which will light when IR radiation is being received. The output of the opamp, pin 6 may be connected to a multimeter
set to read DC volts. Infra red remote control strengths can be compared by the
meter reading, the higher the reading, the stronger the infra red light. I
aimed different remote control at the sensor from about 1 meter away when
comparing results. For every microamp of current
through the photodiode, about 1 volt is produced at the output. A 741 or LF351
will not work in this circuit. Although I have used a 12 volt power
supply, a 9 volt battery will also work here.
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