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Light comparator circuit

2014-11-23 15:38  
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Light comparator circuit
In order to adjust two light source to the same brightness, itcan use this circuit as light compare standard. PC1 and PC2are solar batteries. At the start, it should make the bridge keep balance, and the two photocellshas the same light source, and it uses R as zero adjustment to make the read number point at center zero of guage head.