In order to help his friend prepare for a talk at DEFCON this weekend, [Craig] built an IR photodiode amplifier circuit. The circuit extended the detection range of the hack from a few inches to a ...

Using a bootstrapping scheme with a JFET can enhance a photodiode’s ac response, but adds unwanted dc voltage. Remedy that problem with a matched dual-JFET. 1. This circuit uses a JFET to ...

This array was subsequently processed on a CMOS readout circuit to form what imec calls “a superior thin-film SWIR image sensor.” Nikolas Papadopoulos, project leader, Thin-Film Pinned Photodiode at ...

This pulse oximeter is so simple and cheap to build it’s almost criminal. The most obvious way to monitor the output of the sensor is to use an oscilloscope. The poor-man’s stand-in for… ...