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 ...

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 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 ...

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 ...