The luminous flux test circuit with optical resistors

  
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This is a luminous flux test circuit with optical resistors. In the circuit, the optical resistor RG forms a bridge with RP1,RP2,R1 and R2; RP1 is used to adjust the balance of the bridge; RP2 is used to adjust the sensitivity of the circuit. If we adjust RP1 to make the voltages on a and c are equal, then VTl and VT2 stop, and the thyristor of VSI is off. I..
The luminous flux test circuit with optical resistors - schematic




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