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0-10V Control for RC Servos - In this circuit NE555 is configured as astable
multivibrator. main timing capacitor (220 nF) is always changed to voltage
level which is determined by voltage on NE555 pin 5 (in this circuit that
voltage is aroun 1.6V). When timing capacitor is....(added 05/09/09) |
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1us Light Pulse Receiver Plus Post Amp - This circuit is designed to detect very
weak light pulses lasting 1uS. It uses a tuned LC feedback network to provide high
sensitivity while giving high ambient light immunity. A post voltage amplifier is
included with a gain of about X20. The circuit is described in more detail in the
receiver section of my Handbook of Optical Through the Air Communications. Note:
The LF357 op amp is no longer available, this circuit is for reference only.
.(designed by David A. Johnson) |
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2 channel RF remote control - This RF remote control it runs at 418MHz frequency
and support up to 2 channels. It is very safety as the transmiting code is changing
every time you push any button (roll-code function)
.(electronic schematic added
03/09) |
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2 Line Intercom Plus a Telephone Changeover Switch - circuit presented here can
be used for connecting two telephones in parallel and also as a2-line intercom. (added
5/02) |
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2 Wire Remote Microphone Amplifier - (electronic circuit added 7/03) |
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2-CH RF Remote Control - On these pages, I will introduce Remote Controller with
Radio Frequency. The electric wave sending-out is controlled with the code by PIC for
transmission and the code is deciphered by PIC for receiving.
.(electronic schematic
added 11/08) |
|
3 Channel IR Remote Control - This project is a 3-channel IR remote control with 3
output relay and easy to build. Features: CPU PIC12F629 at 4MHz crystal for Tx/Rx, 3
channel output relay, The Tx use sleep mode for saving battery power, Use Phillips RC5
protocol, distance more than 7 m, Easy circuit to build and assembly and small amount
of components. Uses RC5 protocol which is probably the most used by hobbyists,
probably because the wide availability of cheap remote controls and easy to
understand.
.(electronic schematic added 11/08) |
|
3 Channel RF AVR Remote Control - How many times you needed some remote control to
handle some electric device ? many times. There are lot of remote controls like
infrared, RF, SMS (like my other circuit) and more. The basic small-range remote
controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is
that the signal can not pass the walls. So, if you want to control your garage door,
the only way is to use some RF remote control. The circuit (transmitter and receiver)
use few components and ordinary (I love few component circuits) . Its easy to build it
because you don't have to tune-up any coil or variable capacitor. The RF modules are
fix to work in 418MHz area.
.(electronic schematic added 11/08) |
|
3 Channel RF Remote Control - This is a 3 channel RF remote control project.The
transmitter powered by 3V battery(coin size) range about 10 m. This remote control I
use PIC12F509 from Microchip which is a 8-pin single-chip microcontroller designed for
low pin count applications with 1 K words flash memory and 41Byte SRAM and some
special features such Power-saving Sleep mode,Wake-up from Sleep on pin change.
.(electronic schematic added 11/08) |
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300 MHz AM RF Remote Control System - (electronic schematic / circuit added 4/02) |
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30khz Light Receiver Amp - This circuit uses NPN darlington transistor to amplify
the signal produced from short light flashes, as detected by a PIN photo diode.
The circuit draws only about 330uA from a 6v battery.
.(designed by David A. Johnson) |
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35kHz Magnetic-Radiation Remote-Control - (electronic circuit added 4/05) |
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40khz Laser Burst Detector - This circuit was originally designed to detect weak
flashed of laser light bounced off of a fabric video projection screen. It was used as
part of a firearm training system. It generates a 100mS output pulse whenever it
detects a 3ms to 5ms-laser burst, modulated at 40KHz. It is very sensitive and could
be modified for long-range laser communications.
.(designed by David A. Johnson) |
|
40KHZ LED Test Signal Generator - This 40KHz crystal controlled oscillator circuit
drives an infrared LED with powerful 40ma pulses. The circuit can be used to
test optical communications circuits, designed to receive 40KHz modulated light
signals.
.(designed by David A. Johnson) |
|
40khz Light Receiver Amp - This circuit is similar to number 121 but provides more
gain and operates up to 40KHz. However it draws more power supply current.
.(designed by David A. Johnson) |
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40khz Light Receiver Is Immune to Ambient Light - If you want even more
sensitivity than the above circuit, try this design. When used with a one-centimeter
square photodiode, you can achieve a range of several hundred feet with a standard TV
or VCR remote control module.
.(designed by David A. Johnson) |
|
40khz Modulated Light Detector - This circuit uses a unique cascode amplifier
circuit to convert the current from a PIN photo diode to a current without any
feedback network. It is very stable and very sensitive. The circuit shown has the
potential for a conversion factor of 10 volts per microwatt at 900nm. I included a
simple JFET post-amplifier with a gain of about 20.
.(designed by David A. Johnson) |
|
40khz TV-VCR Light Source Repeater - This circuit is designed to be placed
directly in front of a standard TV or VCR remote. The exiting light pulses produced by
the circuit match the pulses from the remote but are about 10 times more powerful.
Using the device, the remote can operate a TV or VCR over three times the normal
distance.
.(designed by David A. Johnson) |
|
8 channel IR remote control - This IR remote control that you can use to control
other devices or circuits up to 8 devices. The control codes are sent in RC5 format
modulated to about 38 kHz carrier frequency.The IR transmitter powered by the CR2016
which is a 3V button Cells Battery CR2016. To extend the life of the battery this is
done by putting the CPU into SLEEP mode for most of the time and wake-up only when a
key is pressed.
.(electronic schematic added 11/08) |
|
8 Channel RF Remote Control - This is an 8 Channel RF Remote Transmitter and
Receiver that will allow to remotely control various electronic projects. RF Remote
Control provides 2 latched and 6 momentary outputs that could be used to control your
favorite devices such as amplifier, robotic devices, RC cars, computer, home
appliances, lamps and many other cool gadgets.
.(electronic schematic added 11/08) |
|
A Dual Alternating Flashing Light Circuit - This project is best for mounting on a
layout to light a crossing or ring a bell. (electronic circuit added 4/05) |
|
A Low Cost Thermal Peak Detection Charger - The electric model aircraft and car
industries have produced a bewildering array of field chargers for NiCd motor battery
packs. These range from simple 6 or 7 cell chargers consisting of a resistor and
mechanical timer, to more complex chargers with peak detection, cycling, and the
ability to handle 36 cell packs. The resistor/timer type of charger is cheap, but it
is has two drawbacks: it might not fully charge the pack in the allotted time, or it
might overcharge the pack. The more complex chargers have none of these drawbacks, but
they are very expensive.... (diagram added 6/07) |
|
A Miniature High-Rate Speed Control with Brake - Many designs for high-rate speed
controls have been published. Most require two 8-pin integrated circuits ( ICs) or one
14-pin IC. Many designs suitable for home construction are fairly large (some as large
as 2" square). Many do not include a brake..... (electronic construction project added
09/06) |
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A Serial Infrared Remote Controller - (electronic circuit added 4/05) |
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A simple Remote control Tester - (electronic circuit added 10/05) |
|
AC-Power Monitor uses Remote Sensing - 04/26/01 EDN-Design Ideas / (added
6/06) |
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Altec 1566A:Vacuum Tube Preamp & Direct Box Project - There are all sorts of tube
circuits, some of which actually deliver The Sound people associate with Vacuum Tubes.
Did you know, for example, that asymmetrical distortion generates even-order harmonics
while symmetrical distortion produces odd-order harmonics? Neither vacuum tubes
nor transistors are exclusively responsible for either type of distortion, its really
about....(added 6/06) |
|
An Infra-Red Remote Control Extender - This is a battery powered Infra-Red Link
that will allow you to change channels on your Satellite Receiver and operate the
controls on your VCR & DVD from anywhere in the house. |
|
AN-1262: Four-Speed Fan Control using Simple Remote Diode Temperature Sensor -
National Semiconductor Application Note (app note added 6/06) |
|
AN-146: FM Remote Speaker System - National Semiconductor Application Note
(app note added 2/06) |
|
AN531: Intelligent Remote Positioner - Microchip Application Note Published
26-Aug-97 (app note added 2/06) |
|
AN728: Remote Keyless Entry and Convenience Center Reference Design with LIN Bus
Interface - Microchip Application Note Published 26-Sep-02 (app note
added 6/06) |
|
AN796: TC7109 Records Remote Data Automatic ally - Microchip Application Note
Published 12-Nov-02 (app note added 6/06) |
|
Building an RF Remote Control System - (electronic circuit added 4/05) |
|
Camera remote Control system using Basic Stamp - (electronic circuit added 4/05) |
|
Celsius to digital thermometer Works with remote sensor - 04/15/04 EDN Design
Ideas / (added 1/05) You can use a single-supply system to precisely
measure temperature at a remote location with less than 1°C error over a 0 to
100°C range (Figure 1). The circuit includes T1, a low-cost AD590 temperature sensor;
IC1, an AD8541 rail-to-rail amplifier; four resistors; a trimming potentiometer; and
an ADC.... |
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Child's Lamp - (electronic Circuit / Schematic added 10/04) |
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Clap Activated Remote - (electronic circuit added 10/05) |
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Clap Switch - (electronic Circuit / Schematic added 10/04) |
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Combination Controlled Fully Customizable RF Remote Control - (circuit / schematic
design added 6/06) |
|
Computerized Infrared Remote - control your stereo, TV and VCR from Windows,
includes schematic and software (added 5/02) |
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Decoding Infrared Remote Controls - ASCII format (electronic schematic / circuit
added 4/02) |
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Device Control using DTMF - Controlling devices using switches are common. From a
few decades controlling devices using remote control switches like infrared remote
control switch, wireless remote control switches, light activated switches are
becoming popular. But these technologies have their own limitations. Laser beams are
harmful to mankind.
.(circuit design added 11/08) |
|
DIY 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. Latched outputs can be toggled
on/off by one button per channel, or turned on and off by two buttons per
channel
.(electronic schematic / circuit added 4/02) |
|
Doorbell Indicator-Remote - (electronic design added 6/07) |
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Downed Model Locator - The circuit draws 1mA (!) when idle and 4 mA when buzzing.
I've been using large peizo buzzers (see part numbers below) because they are light
and loud, and the 6 volt electromagnetic buzzer where weight is not so much of a
concern..(circuit design added 08/08) |
|
Downed Model Locator II - Here is another device to help you locate your downed
R/C sailplane in the bushes and weeds. Similar to the other design, this circuit
plugs into a spare servo socket on your receiver, and it is a pulse omission detector.
The alarm sounds when pulses originating from your transmitter are no longer being
received--turn off your transmitter to turn on the
.(design added 08/08) |
|
DTMF Radio Remote Control - 4 channel remote control. (circuit added 6/07)
|
|
DTMF Radio Remote Control - 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.
(electronic circuit added 6/07) |
|
Fire Stick infrared Remote Control - (circuit design added 8/03) |
|
FM Remote Speaker System - National Semiconductor Application Note
(app note added 2/06) |
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FM RF Remote Control 88-108 MHz - 1KM Range (added 6/06) |
|
Four Channel RF remote Control - (electronic circuit added 4/05) |
|
Four way remote control uses series transmission - 01/18/01 EDN Design Ideas / (addes
08/05) A simultaneous four-way remote-control system adheres to size, cost, and
reduced-complexity constraints and uses a series transmission to drive parallel loads
(Figure 1). You can use this system as long as the time constant of the load is much
larger than the total transmission time for all data. With these considerations, this
design can drive any object with four simultaneous controls as motors. |
|
Four-Speed Fan Control using Simple Remote Diode Temperature Sensor - National
Semiconductor Application Note (app note added 6/06) |
|
Garden Timer with Remote control - Few years ago we control the lights in the
garden with a automatic-timer-switch, very nice but when the evening gets longer or
shorter we had to adapt the timer each week. In that time I came in contact with
programming microprocessors so my first project was born. The first garden timer was a
simple 1 output. The timing was controlled by the PIC and every month I had to change
the minutes. So back to the table and design the second garden timer able to control 3
relays - left, mid and right side of the garden. It provided also 4 modes: always
off always on from dusk to dawn from dusk to timer and the timing was dedicated
to a RTC DS1307.
.(design added 11/08) |
|
How to Build a 300MHz AM RF Remote Control System - (electronic circuit added
4/05) |
