When the sensor detects the RF signal, clock input of IC1 gets pulses and its output pins 2 and 4 becomes high and low alternately giving flashing lights and beeps. The coil used in the circuit is a ...

Collecting evidence at a crime scene used to involve a really sophisticated piece of technology — the tape measure.

An $80,000 3D laser scanner is helping Bend police with investigations at major crime scenes, providing greater accuracy while freeing officers for other duties.