Circuit Cellar October 2008

Create a Signal Source for a Variety of RF Applications

Neal describes how he built an inexpensive and accurate variable-frequency signal generator on a two-sided PCB. The system delivers frequencies from 0 to 3 GHz with a frequency accuracy of less than 200 Hz.

You can add USB to your next project with Microchip Technology’s new array of parts. The 8-, 24-, and 32-bit microcontrollers will complement your designs with USB peripheral support, embedded hosting, and dual-role and OTG capabilities.

Several years ago, Ed built a system that enabled him to communicate with a fellow rider via an electret microphone connected to an amateur radio during bicycle rides. This month, he explains how he rebuilt the interface and combined it with a GPS tracking system.

Peter continues describing how he built an easy-to-use remote for his animatronic systems. This month, he describes the software and menuing code.

You can add USB to your next project with Microchip Technology’s new array of parts. The 8-, 24-, and 32-bit microcontrollers will complement your designs with USB peripheral support, embedded hosting, and dual-role and OTG capabilities.

Robert recently came across an old book about electronic design. After reading about the topic of noise coupling with various cables and wiring setups, he reproduced the cable shielding experiments described in the book. This month, he shares the results.

As Tom explains, having all the MIPS and megahertz in the world means nothing unless your design has some meaningful real-world data to process. To gather such meaningful data, you need innovative sensors. This month, Tom introduces a handy option you should consider for your next temperature-sensing design—an infrared noncontact IC thermometer.