AC grid powered light emitting diode circuit diagram

The circuit simply consists of an integrated operational amplifier, a TCA335A, and a silicon photodiode BPX91. Using the BG38.2mm optical filter can make the photoode's sensitivity to light consistent with that of the human eye. Switch S is used to convert the range in decimal from 10*2 to 10*5 1x. The 100uA meter is used to indicate the value of illumination.

Main technical data: Working voltage Us: plus or minus 3V Working current Is: 0.5mA Full-scale measurement range B: 10*2～10*51x Temperature coefficient a: +0.2%/K Maximum output current I: <1mA