Make a Differential Light Meter With an Op Amp
Instructables user SarahandDillon made a differential light meter with a TL082 op amp; it compares the readings of two photo sensors. This works in the exact same way as the improved transimpedance amplifier, except that the current flowing out of Vout, through the resistor/capacitor barrier, to V- is now the sum of the two photodiode […]