R/C Circuit - (Tony van Roon's electronic circuit added 4/05)

R/C Digital Camera Controller - (electronic circuit added 4/05)

R/C Receiver <-> Joystick Port Interface for Flight Simulators - ….(electronic schematic added 06/09)

R/C Switch - This circuit is a so-called "Radio controlled Electronic Switch". It can be used to switch on/off anything electrical, whatever it is. Here are a couple of examples: navigation lights, landing gear, sound systems, Glowplug driver, bomb release, parachute, search lights, gyros, and so on. This circuits connects to a RC car controller servo output. (Tony van Roon's electronic design added 4/05)

Radio Remote Control using DTMF - NOTE:  Fair Warning -  Annoying popup.  Here is a circuit of a remote control unit which makes use of the radio frequency signals to control various electrical appliances. This remote control unit has 4 channels which can be easily extended to 12. This circuit differs from similar circuits in view of its....(added 6/07)

Rc5 IR Remote Control Transmitter - In this Application Note the widely used RC5 coding scheme from Philips will be described and a fully working remote control solution will be presented. This application will use the ATtiny28 AVR microcontroller for this purpose  (app note added 3/05)

RD68HC908IRC : MC68HC908QT2 Based Simple Infrared Remote Control Reference Design - Motorola has developed a simple, single dedicated device, infrared remote control designed to control a DVD player. This reference design demonstrates how to time and create modulated infrared signals used to control six basic functions of the DVD player.  (app note added 6/06)

RD68HC908LHID : LIN-bus HID Lamp Levelling Stepper Motor Control using the Motorola 908E625 - This reference design describes a car High Intensity Discharge (HID) lamp leveling system with a LIN-bus interface. An essential part of the system is a stepper motor controller operating as a LIN-bus slave (LIN Stepper Controller). All functionality is provided by a general purpose LIN-bus IC MM908E625 and LIN Stepper software (HC08 software).....(app note added 6/06)

Redundant Fan Systems using the TC647 Fan Manager - Microchip Application Note Published 4-Feb-02  (app note added 6/06)

Reference Design for an 802.11b/g RF Front-End Module Using the MAX2830 - Maxim App Note 4156  -- 3/27/2008 --  (app note add 5/08)

Remote Charging Circuit uses Three Wire Sensing - 05/25/95, EDN-Design Ideas:  Remote voltage sensing usually uses a four wire sensing System, this System works with three Wires.....(design idea added 4/05)

Remote control - build your own - (design added 05/09)

Remote Control - This is a simple wireless remote control unit, which was originally designed for a model hovercraft which I was developing with the help of my friend Uday Arya. The project has been discontinued for technical reasons, but this remote control unit survives. The method used seems to be quite popular among many remote control units. ….(electronic schematic added 11/08)

Remote Control Dog Door Opener - Gadget Freak:  Remote Control Dog Door Opener.  Sometimes you can't teach an old dog new tricks. Tired of trudging down the stairs to let his dog out of his cage in the middle of the night, Les designed a remote control door opener. The system …. (added 05/06/07)

Remote Control Encoder/Decoder with PIC16C620 and PIC12C510 - (electronic circuit added 09/04)

Remote Control for Home Appliances - Connect this circuit to any of your home appliances (lamp, fan, radio, etc) to make the appliance turn on/off from a TV, VCD or DVD remote control. The circuit can be activated from up to 10 metres. The 38kHz infrared (IR) rays generated by the remote control are received by IR receiver module TSOP1738 of the circuit. Pin 1 of TSOP1738 is connected to ground, pin 2 is connected to the power supply through resistor R5 and the output is taken from pin 3. The output signal is amplified by transistor T1 (BC558). The amplified signal is fed to clock pin 14 of decade counter IC CD4017 (IC1). Pin 8 of IC1 is grounded, pin 16 is connected to Vcc and pin 3 is connected to LED1 (red), which glows to indicate that the appliance is ‘off.’ ….(design added 11/08)

Remote Control for Sony a /  Volt Equipment - PIC based remote controller for Infrared and wired Control-S bus (added 4/05)

Remote Control Transmitter - Although ready-made remote controls are easy to get, with this project we show how to build on at home. Features are impressive, with 6 radio channels and long battery life. Complete with PCB layout. (electronic design added 6/07)

Remote control transmitter - control devices from the PC - Control all your devices from the PC. This infrared remote control transmitter can be controlled from the PC serial port. It speaks different remote control formats, like the Philips RC-5 standard and can be tailored to other specific types…..(design added 05/09)

Remote Control Turns Battery on and Off - 09/12/97, EDN-Design Ideas:  (design idea added 4/05)

Remote control using telephone - Here is a tele-remote circuit which enables switching "on" and "off" of appliances through Telephone lines. The circuit described here can be used to switch up to nine appliances (corresponding to the digits1 through 9 of DTMF the Telephone key-pad). The Telephone can be used to switch....(added 4/02)

Remote control using VHF modules - A few designs for remote control switches, using VG40T and VG40R remote control pair, are shown here. The miniature transmitter module shown in Fig. 1, which just measures 34 mm x 29 mm x 10 mm, can be used to operate all remote control receiver-cum-switch combinations described in this project....(10/05)

Remote Controlled Sign - Nowadays, remote controls are cheap enough to allow addition to any kind of electronic device - included simple ones. In order to have a remote controlled,…(electronic design added 6/07)

Remote Door Lock (Seiichi Inoue) - …(circuit design added 05/08)

Remote Doorbell Indicator - (electronic schematic / circuit added 4/02)

Remote Doorbell Warning Switch - This circuit should only be used with the solenoid type chime doorbells, the electronic type that play tunes will not work here. The hardest part for this circuit was the title. It is quite easy to miss the sound of a doorbell if you are watching TV , this circuit gets round the problem by providing a visual indication, i.e. a lamp....(added 2/06)

Remote Humidity Sensor needs no Battery - 04/04/02, EDN-Design Ideas:  Using ac-line power sources and batteries for remote humidity sensors is undesirable because these sources can be troublesome if you mount them in inaccessible points, such as smokestacks, cold-storage chambers, or darkrooms, where maintenance is difficult and inconvenient.....(design idea added 1/05)

Remote IR Control Panel - Some projects need a control panel, but are in situations which make that cumbersome. Unlike bench equipment, which would be useless without built-in readouts, other control devices could use interfacing just to alter a few settings or take occasional readings. This device's first job will be interfacing to my hydroponic controler.….(design added 06/09)

Remote Keyless Entry and Convenience Center Reference Design with LIN Bus Interface - Microchip Application Note Published 26-Sep-02  (app note added 6/06)

Remote LED Indicator Light - There are times when you would like to transmit a signal from one LED indicator light to second LED at another location.  The circuit below works well for this application.  It takes advantage of the fact that the internal infrared LED inside an opto-isolator has a lower voltage drop than the visible LED being tapped into.  Using a darlington type opto-isolator also means very little current needs to be diverted to the isolator..... ….(designed by David A. Johnson)

Remote Monitoring System Sends E-mail via SMS  - This application note demonstrates how to make a simple system that monitors temperature and analog voltages remotely. On meeting certain alarm conditions, the system can send SMS messages, which are then converted to E-mail and forwarded to the designated E-mail address.... (added 08/08/08)

Remote Solar LED light - (diagram added 6/03)

Remote Switch uses No Power Fiber Optic Link - 10/10/96, EDN-Design Ideas:  (design idea added 6/06)

Remote temp Sensor Needs No Power Supply - 12/21/95, EDN-Design Ideas:  (design idea added 6/06)

Remote Thermometer - This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor's output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply cables. The receiver section counts the bursts coming from mains supply and shows the counting on three 7-segment LED displays. The least significant digit displays tenths of degree and then a 00.0 to 99.9 °C range is obtained. Transmitter-receiver distance can reach hundred meters, provided both units are connected to the mains supply within the control of the same light-meter. ….(circuit design added 11/08)

Remote-Operated Musical Bell - (circuit / schematic design added 6/06)

Repeating Timer No.5 - This circuit is a temperature controlled version of Repeating Timer No.3 . The light dependent resistor has been replaced by a temperature dependent resistor - or thermistor. And a small preset potentiometer lets you set the temperature above which the timer will operate.

Resistor-Switch Networks for Audio Volume Control - The traditional potentiometer is implemented with an electrical contact that slides over a resistive layer. An example of a well-known audio-grade potmeter is the Alps Blue. I still use this one myself. A high-end (good and costly) alternative is the rotary switch. This device....(added 08/08/08)

RF HF-VHF-UHF Voltage Controlled Oscillators using HyperAbrupt Tuning Diodes - MicroNote 707) from Microsem  (app note added 6/06)

RF remote Control Based on Basic Stamp - (circuit / schematic design added 6/06)

Rf Remote Control System - (schematic / circuit design added 9/02)

Robotic Microcontroller Board - (electronic circuit added 4/05)

Rolling Code 4-Channel UHF Remote Control - (electronic circuit added 4/05)

Room Temperature Controller - room temperature controller with PIC. This equipment uses two temperature sensors, drives external equipment, and keeps the temperature of the room at preset temperature. The purpose of this equipment is for preventing room temperature going up with the heat of the computers. Electric cost will become high if an air-conditioner is always operated. Then, I made the equipment which adjusts the temperature of the room automatically using some ventilation fans. The function below preset temperature is a function attached moreover. I think that it can use for temperature control, such as a greenhouse. ….(design added 11/08)

Rotary Controller Positions Stepping Motor - 08/03/95, EDN-Design Ideas:  (design idea added 6/06)

Route Control for Stall Motor Switch Machines - (circuit / schematic design added 6/06)

RS-232 Transceiver with Automatic Power Shutdown Control - DN30  Design Notes (Linear Technology) (app note added 6/06)

Rules of Thumb Aid in Timeconstant Analysis - 11/07/97, EDN-Design Ideas:  (design idea added 02/05)