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R/C Circuit - A simple and effective receiver for actuating garage
doors, starter motors, alarms, warning systems and numerous other
possibilities. The SCR, which has a very low trigger current of 30 uA is
typical -- it requires an input power of only 30 uW to activate the relay. A
high Q tuned antenna circuit assures rejection of spurious signals. A whip or
wire antenna is adequate up to 100 feet from a low power transistor
transmitter. A momentary-off switch resets the circuit…. [Tony van Roon's
circuit] |
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R/C Digital Camera Controller - (electronic circuit added 4/05)
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R/C Receiver <-> Joystick Port Interface for Flight Simulators -
….(electronic schematic added 06/09) |
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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 circuit] |
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Radio Remote Control using DTMF - 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 simplicity and a totally different concept of generating the
control signals.... [Radioland.net] |
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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) |
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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)
|
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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) |
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Redundant Fan Systems using the TC647 Fan Manager - Microchip
Application Note Published 4-Feb-02 (app note added 6/06) |
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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)
|
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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.... EDN is migrating links. This link is
not verified. Google the "title" + EDN for new link. |
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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) |
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Remote Control - In the article ‘RGB LED Mood Lighting’ (Elektor,
February 2008) we mentioned that a remote control could be added to the unit.
Here we describe how it is done, connecting an eZ430-RF2500 to the MSP430
microcontroller. The ideas presented can be adapted to a wide range of other
applications.….must register on this site... [Published in Elecktor
July/August 2010] |
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Remote Control based on PIC - Control up to 8 devices by this easy
constructable remote control. It can work as a radio or infrared remote
control, depending on the components. Each device output can be configured to
be momentary (turned on while you press the button) or latched…. [Peter Jakab,
Electrical Engineer, Engineer of Informatics] |
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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) |
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Remote Control Encoder/Decoder with PIC16C620 & PIC12C508 -
(electronic circuit added 09/04) [Peter Jakab, Electrical Engineer, Engineer
of Informatics] |
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Remote Control Extender Mk 4 - An Infra Red wired Repeater circuit
to control appliances from a remote location…(circuit added 01/2010)
|
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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) |
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Remote Control for Sony a/ Volt Equipment - PIC based remote
controller for Infrared and wired Control-S bus (added 4/05) |
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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) |
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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) [Peter Jakab, Electrical Engineer, Engineer of
Informatics] |
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Remote Control Turns Battery on & Off - 09/12/97 EDN-Design Ideas
EDN is migrating links. This link is not verified. Search the "title" +
EDN for new link. |
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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) |
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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.... [Radioland.net] |
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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) |
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Remote Door Lock (Seiichi Inoue) - …(Circuit design added 05/08)
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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.... by Andy Collison] |
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Remote humidity sensor needs no battery - 4-Apr-02 Issue of EDN
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. Figure 1 shows a simple way
to remove the power source from the humidity-sensor circuit.... [Design Idea
by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India] |
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Remote IR Terminal - 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.…. [Luhan Monat -
Mesa Arizona] |
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Remote Keyless Entry & Convenience Center Reference Design with LIN Bus
Interface - Microchip Application Note Published 26-Sep-02
(app note added 6/06) |
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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] |
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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) |
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Remote Reset Gadget - This was a trivial, but very useful hack for
work. The code is meant for an 8751, with 24 relays or optocouplers driven off
ports 0-2. Under serial port control, it will blip a selected relay for a half
second or so. [Designed by Markus Wandel] |
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Remote Solar LED light - I created this circuit in an attempt to
make the simplest possible solar powered project. It would make for an
excellent science fair project, and would also serve as a good introduction to
solar powered circuitry. It may also have some practical uses, such as
shedding some light into a dark part of your house. The idea is simple, the
solar panel converts sunlight into a trickle of electricity. The electricity
is used to run a white LED.... [G. Forrest Cook] |
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Remote Switch uses No Power Fiber Optic Link - 10/10/96 EDN-Design
Ideas....EDN is migrating links. This link is not verified. Search the
"title" + EDN for new link. |
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Remote temp Sensor Needs No Power Supply - 12/21/95 EDN-Design
Ideas....EDN is migrating links. This link is not verified. Search the
"title" + EDN for new link. |
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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) |
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Remote two wire positioner - A simple and inexpensive way to
remotely rotate a display or object is with a positioner that uses a stepper
motor to rotate it. The motor is driven by a circuit mounted near the motor
and by a control circuit at a remote location….. [free schematic from
Golab.com] |
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Remote-controlled Preamp with Digital Pot - This circuit is a simple
but high-quality preamplifier using a DS1882 digital potentiometer, a device
specially designed for audio applications. The potentiometer is controlled
over an I2C interface by an R8C/13 microcontroller. The main features of the
design are its remote control and lack of moving parts.….must register on this
site... [Published in Elecktor July/August 2010] |
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Remote-Operated Musical Bell - (circuit / schematic design added
6/06) |
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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. [Circuit by Ron J.] |
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Reset an SOC only when power is ready - 3-Dec-09 Issue of EDN
Use a comparator, an AND gate, and a capacitor to properly reset an SOC....
[Design Idea by Goh Ban Hok, Lantiq Asia Pacific Pte Ltd, Singapore] |
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Reset circuit provides snappy action - 04/29/99 Issue of EDN
The circuit in Figure 1 provides a 1-sec reset, using multiple AND gates for
increased fanout. Intended for breadboarding or prototyping, the circuit
generates a "snappy" master reset that remains active long enough to eliminate
questionable start-ups. When you apply power to the circuit,....Page includes
several designs. Scroll to find this one.... [Design Idea by Steve
Kelley, Protobyte Inc, Liberty, MO] |
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Reset generator uses "fleapower" - 27-Jun-02 Issue of EDN When
a processor-controlled device must operate reliably, designers often choose to
periodically reset the processor rather than rely on a watchdog configuration.
In low-power systems, this periodic-reset circuit can consume a large part of
the system's current budget or may fail to operate at low voltages.... [Design
Idea by Philip Simpson, Maxim Integrated Products, Reading, UK] |
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Reset supervisor waits for stable supply - 17-Apr-03 Issue of EDN
The power-up cycle of the supply voltage in embedded-system applications is
sometimes not a clean event. This fact holds especially true in
battery-operated systems, because the insertion of a battery often causes
significant ringing or glitching on the supply line (Figure 1]. In products
with on-off switches, the contact bounce of the switch can cause an unclean
power-up.... [Design Idea by Mike Mitchell, Texas Instruments, Dallas, TX] |
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Resistor network sets gain for fixed gain differential amplifier -
7-Jan-10 Issue of EDN Get the right amount of gain for your op-amp
application.... [Design Idea by Miles Thompson, Maxim Integrated Products,
Sunnyvale, CA] |
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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) |
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RF HF-VHF-UHF Voltage Controlled Oscillators using HyperAbrupt Tuning Diodes
- MicroNote 707) from Microsem (app note added 6/06) |
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RF remote Control Based on Basic Stamp - (circuit / schematic design
added 6/06) |
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Rf Remote Control System - (schematic / Circuit design added 9/02)
|
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Robotic MicroController Board - (electronic circuit added 4/05)
|
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Rolling Code 4-Channel UHF Remote Control - (electronic circuit
added 4/05) |
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Room heating controller - Tired of mechanical thermostats that
overshoot the set point and make you waste expensive energy? Here is a
phase-control device that works well and is simple! [Manfred Mornhinweg] |
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Room Monitor - This circuit allows audio monitoring of a remote
location and so doubles as a room monitor or baby alarm. It can be run from a
12 Volt battery or mains power supply as shown below. Interconnect uses 3
wires, so multi core cable can be used; alarm or telephone cable is suitable
just leave any extra wires free... [Andy Collison] |
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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) |
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Rotary Controller Positions Stepping Motor - 08/03/95 EDN-Design
Ideas....EDN is migrating links. This link is not verified. Search the
"title" EDN for new link. |
|
Route Control For Stall-Motor Switch Machines - This page shows some
methods of track routing control for Stall-Motor type switch machines. The
principle method uses a 2 Pole Multi Position rotary switch while an alternate
uses optoisolators and transistors to select the routes. [from Rob Paisley's
Model Train web site] |
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RS-232 Transceiver with Automatic Power Shutdown Control - DN30
Design Notes (Linear Technology) (app note added 6/06) |
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Rules of Thumb Aid in Timeconstant Analysis - 11/07/97 EDN-Design
Ideas An RC circuit charges or discharges to within 36.8% of the total
excursion in one time constant, t, where t=RC. However, 36.8% is an awkward
figure, and you usually need a calculator to achieve reasonable accuracy. You
need a shortcut for these "back-of-the-envelope" calculations An RC circuit
charges or discharges to within 36.8% of the total excursion in one time
constant, t, where t=RC. However, 36.8% is an awkward figure, and you usually
need a calculator to achieve reasonable accuracy. You need a shortcut for
these "back-of-the-envelope" calculations.... [Design Idea by Tony Zizzo,
Burr-Brown, Tucson, AZ] |
