Communications | Circuit Cellar

Photo 2 from the Febuary article, "RFI Bypassing (Part 1)." A pair of axial-lead resistors isolate the tracking generator and spectrum analyzer from the components under test. The 47-Ω SMD resistor, standing upright just to the right of the resistor lead junction, forms an almost perfect terminator. (Source: Ed Nisley CC259)

With GPS technology and audio radio interfaces on his personal fleet of bikes, Circuit Cellar columnist Ed Nisley’s family can communicate to each other while sending GPS location data via an automatic packet reporting system (APRS) network. In his February … Continue reading →

GPS-Based Vehicle Timing & Tracking Project

You can design and construct your own vehicle timing system at your workbench. Steve Lubbers did just that, and he describes his project in Circuit Cellar 269 (February 2012). He calls his design the “Kart Tracker,” which he built around … Continue reading →