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LINEAR_LIGHT_METER_CIRCUIT

2017-03-06 20:23  
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LINEAR_LIGHT_METER_CIRCUIT
This circuit uses a low-input-bias op amp to give a steady dc indication of light level. To reduce circuit sensitivity to light, R1 can be reduced, but should not be less than 100 K. The capacitor values in the circuit are chosen to provide a time constant sufficient to filter high-frequency light variations that might arise, for example, from fluorescent lights.