Figure 2 A feedback circuit consisting of a single-pole lowpass active filter and a Howland source diverts current from the phototransistor’s base to avoid saturation at excessive background-light ...

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Olympia Circuits Teases Arduino Programmers With $60 Arno Shield. by Ray Willington — Monday, April 29, 2013, 05:50 PM ... - One phototransistor to detect infrared and visible light ...

A phototransistor uses light to modulate how much current passes through it. In this part, a voltage divider is implemented using a phototransistor that can sense infrared light. By placing a ...

Olympia, WA, April 29, 2013– Olympia Circuits introduces the Arno Shield to expand their line of products for new Arduino users. The Arno Shield contains all the components necessary to learn ...