| http://www.w3.org/ns/prov#value | - The collector of the phototransistor 2 is connected with the power supply terminal and the emitter is connected to the inverting input of a first operational amplifier 10 and to the output terminal of the first operational amplifier 10 through a resistor (of e.g 100 K??) 11, and further, to the output terminal of a second operational amplifier 13 through a resistor (of e.g. 1 K??).
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