The rotate speed test circuit made by optoelectronic transistor

Published:2011/7/13 20:10:00 Author:leo | Keyword: Rotate speed test circuit, Optoelectronic transistor | From:SeekIC

The picture1 shows rotate speed test circuit made by optoelectronic transistor and so on. When the luminous flux of the optoelectronic transistor VT1 increases by 1%, photo current generates 500 mV voltage between VT2 and VT3. And this voltage is stable logarithm relation under the biggish photoelectic current.Therefore, this circuit can work normally however the optical line changes. A1 and related components form high gain self-adapting filter which can hold down the photo noise in the environment and add clean signals to comparator and input port.



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