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AS Level     Op Amp     >Delta Lux<     Gain     Schmitt Astable     Schmitt Trigger     Virtual Earth     Voltage Follower    

Op Amp Delta Lux


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  AS Level    Op Amps  0 of 5    Question 1028    Op Amp Circuits 
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Detect Changes in Light Level

Comparator Detects Changes in Light Level

This circuit detects sudden drops in LUX level. Slow changes are ignored. It could be used as an intruder detector if the intruder interrupted a light beam. It was originally designed as a fish bite detector. When the fish pulls on the fishing line, a card is moved, covering an LED shining on the LDR. This causes a drop in the light reaching the LDR.

To allow the circuit to run on a single 12 Volt supply, R5 and R6 act as a Voltage divider providing a 6 Volt line. This is half the power supply voltage because the resistors are equal. This 6 Volt line is decoupled by C2. This removes any AC signals from this line.

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