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Resistor Substitution Box - PIC Project Commercial substitution boxes uses a lot of switches and a set of fixed
resistors. The advantage is that they have a large range of resistance and work at higher voltages. This
device is only good for use in circuits of 12 volts or so but it is much smaller and cheaper. It uses a log
taper 2 watt potentiometer (Digikey part# KA1031S28) to produce a range of resistance values from about 50
ohms to 10k ohms. . . [Luhan Monat - Mesa Arizona]
Resistors In Digital Circuit - 02/02/95 EDN Design Idea When I was a young technician, my associates and I arrogantly
believed we could build anything with enough 10k resistors and duct tape. Now it seems that even simple
electronic toys use several million transistors encased in tiny SMT packages with hundred. . . [by Jack
Ganssle, Embedded-Systems Contributing Editor]
Resolution
Enhancements of Digital Potentiometers with Multiple Devices - AN-582 Analog Devices App Note - . . .
Resolver
Integration - AN-234 Analog Devices App Note - . . .
Resolver to
Digital Conversion; Simple Alternative to Optical Shaft Encoders - AN-263 Analog Devices App Note - . . .
RF Remote Control System - With a handful of inexpensive components, a little creativity, and the power of PicBasic,
you can build some pretty outstanding robotics creations as Rob Arnold proves with his Ruf-Bot project. . .
[Rob Arnold]
Ride the
logic thresholds - 08/03/00 EDN Design Idea Most
logic devices have a 5V supply rail. However, you often need to know the upper and lower switching thresholds
for a device operating at supply levels other than 5V. In some cases, it is also important to know the
variation . . . [by Roger Griswold, Maxim Integrated Products, Sunnyvale, CA]
RLC circuits match transmission lines to loads - 04/10/97 EDN Design Idea In many systems, transmission lines drive reactive (mostly
capacitive) loads. To preserve signal integrity, you should properly terminate the lines. However, the input
impedance of CMOS logic ICs, for example, comprises a high resistance in parallel with capacitance. A
mismatch at the line’s end causes reflections and pulse-shaped distortion. You can use simple RLC circuits to
compensate for the mismatch. In RF designs, the goal in matching impedances is to transfer power with maximum
efficiency. . . [by Boris Dvoskin, Worcester, MA]
Rolling-code generator uses flash microcontroller - 05/03/01 EDN Design Idea Many security-alarm systems require the use of a random number. A
computer program uses this random number to create a sequence of random numbers to prevent unwanted visitors
from gaining entry into a protected facility. You can . . . [by Wallace Ly]
Rotary Encoder Mates With Digital Potentiometer - 03/06/03 EDN Design Idea Buck IC boosts battery voltage for white LED - 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 of. . . [by Peter Khairolomour, Analog
Devices, San Jose, CA]
RS-232 Interface to PIC - PIC Project The standard rs-232 (com port) interface specifies +/- 12 volt signals. It is
possible to work quite well with +/- 5 volts. This circuit works by 'stealing' the negative voltage from the
COM port and using it to communicate back. . . [Luhan Monat - Mesa Arizona]
RS-232 to TTL Cable - . . .
RS-232 to TTL Translator - A simple terminal program on a PC can have a lot of uses. The hang-up is that most of
those uses involve communicating with a device running on 5 volts. I've done several schemes over the years
but this one is my favorites. . . [Luhan Monat - Mesa Arizona]
RS-232 Xlater - A simple terminal program on a PC can have a lot of uses. The hang-up is that most of
those uses involve communicating with a device running on 5 volts. I've done several schemes over the years
but this one is my favorites. . . [Luhan Monat - Mesa Arizona]
RS485-Like Multi-Drop Bus with Half Duplex Serial
Protocol - PBUS is an RS485-like multi-drop bus for
interconnecting PIC and other microcontroller-driven devices. Protocol and software is written by Jap. Just
include a separate PBUS library file into your project and add your command handlers for the specific device
in a few lines. . . [Peter Jakab, Electrical Engineer, Engineer of Informatics]
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