Infra-red Remote Control Tester Circuit


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.

Infra red Remote Control Tester Circuit

Infra-red Remote Control Tester Circuit Diagram


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