Quadrature Signal Interface to a COP400 Microcontroller:  National Semiconductor Application Note   (app note added 2/06)

Quiet Fct Logic Advances (Replacement for ABT Logic):  Pericom Semiconductor Application Brief # 003 (app note added 02/05)

R/C Digital Camera Controller:  (circuit / schematic design added 6/06)

Radiation Design Considerations using CMOS Logic:  National Semiconductor Application Note   (app note added 2/06)

Rapid Prototyping Methods for Embedded System Development:  Agilent Application Note   (app note added 6/06)

Rapid Prototyping Speeds Development of UMTS W-CDMA Algorithms:  Agilent Application Note   (app note added 6/06)

Ratiometric Sensing using the PIC16C774:  Microchip Application Note Published 4-Apr-00   (app note added 2/06)

RC Controlled Digital Camera:  Fair Warning, site contain annoying popups.  The aim of this project was to get a digital camera into a small electric radio controlled (RC) airplane and still have it fly. The airplane shown, a park flyer, weighs between 400 and 550 grams depending on the size of battery and wing configuration that I use... (added 6/06)

Reading Data from the Parallel Port:  (electronic (schematic / circuit added 11/05)

Real-Time Operating System for PIC16/17:  Microchip Application Note Published 7-Jan-00   (app note added 2/06)

Reducing Noise on Microcomputer Buses:  National Semiconductor Application Note   (app note added 2/06)

Remote Digital Thermometer Sends Data over AC Power Line:  (electronic circuit added 4/05)

Replace an External Gate with a Resistor :  08/17/98 EDN-Design Ideas / (added 3/03)  

Resistance and Capacitance Meter using a PIC 16c622:  Microchip Application Note Published 26-Aug-97   (app note added 2/06)

Resolution Enhancements of Digital Potentiometers with Multiple Devices:  AN-582 Analog Devices Application Notes  (app note added 6/06)

Resolver to Digital Conversion; Simple Alternative to Optical Shaft Encoders:  AN-263 Analog Devices Application Notes  (app note added 2/06)

Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS1621:  App Note 127: Maxim IC  (application note added6/06)

Ride the Logic Thresholds:  08/03/00 EDN-Design Ideas  / (added 2/06)    

RLC circuits match transmission lines to loads:  04/10/97 EDN-Design Ideas / (added 6/06)  

Rolling Code Generator uses Flash Microcontroller:  05/03/01 EDN-Design Ideas / (added 2/06) 

Rotary Encoder Mates with Digital Potentiometer:  02/06/03 EDN Design Ideas  /  (added 1/05)  In developing electronic systems, designers look for products or ideas that may benefit from the better performance, smaller size, lower cost, and improved reliability that an IC can offer. Toward that end, the digital potentiometer emerged as an alternative to its mechanical counterpart, the mechanical potentiometer....

RS-232 to TTL Cable:  (circuit / schematic design added 6/06)

RS485-Like Multi-Drop Bus with Half Duplex Serial Protocol:  (electronic circuit added 4/05)