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Last Updated: December 01, 2017 03:41 AM

Circuits Designed by Dave Johnson, P.E.

Remote Extender CircuitThis 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. . . Circuit by David Johnson P.E.-June, 2000

Remote Range Extender TV/VCRI often get frustrated by how poor some infrared remotes in many new electronic devices operate.  I used to be able to turn on the TV from 30 feet away.  Now, it seems that I have to get within 15 feet.  To address this issue, I designed the circuit shown below.  The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices.  The result is a communications range some 4 to 5 times longer. . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2000

Remote Relay DriverI received a call from a Discover Circuits visitor who wanted a simple way to turn on an outside lighting system using a low voltage control line.    I suggested the simple circuit below.    The circuit is powered by a 9v battery and uses a very efficient latching relay.    Two low voltage wires lead from the a toggle switch to the remote relay.    A toggle switch selects either the on or off condition of the relay.    The relay contacts are rated at 10 amps, so the small relay can handle a sizeable amount of power.. . . Circuit by David Johnson P.E.-April, 2014

Remote TV Camera PowerA while back I received an email from a company with a problem.  They needed a security camera installed at some remote location.  The camera was a high quality color camera sending out standard NTSC video through a long 500 foot 50 ohm coax cable.  With some difficulty they got the coax strung.  They were told that there would be AC power near the camera location to power that device.  But, they then learned that in fact, there was no power available.  They thought about using a solar panel and a battery but they decided to call me for help instead.  Was there some way to power the camera without stringing another cable? . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2011




Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

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,  __ Designed by Projects & Ideas from Nutchip.com

Remote CPU/ASIC/FPGA Temperature Sensor -  The LTC2997 is a high-accuracy analog output temperature sensor.  It converts the temperature of an external sensor or its own temperature to an analog voltage output.  A built-in algorithm eliminates errors due to series resistance between the LTC2997 and the sensor diode.  __ Linear Technology/Analog Devices App Note, Jul 7th 2011

Remote digital thermometer sends data over AC power line -  This circuit is a simple oscillator.  It's frequency is in the range 35 kHz60 kHz and it' s adjustable.   __ Designed by Ali Alipour.ralipoor90 @ gmail.com

Remote display -  On this page, I will introduce remote display with PIC16F873.  The asynchronous communication function (USART) of PIC16F873 is used for this equipment.  The information which is set with the control unit is displayed on the large-sized display installed in the about 10-m left place using the cable.  The size of the displaying unit has 25-cm height, 40-cm width.  It is not so large size __ Designed by Seiichi Inoue

Remote Door Lock -  Recently, many cars are equipped with Remote Car Door Controller called Keyless entry.  On this page, I will introduce the equipment which changed a remote control for the engine start into the door lock __ Designed by Seiichi Inoue

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 __ Contact: IQ Technologies

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 __ Designed by Andy Collison

Remote Emergency Alarm for Unmanned Lifts -  In unmanned lifts or elevators, sudden power failure cannot be detected from the remote operating room, and this can prove dangerous for the lift users.  Here is a simple circuit that...__ Electronics Projects for You

Remote Extender Circuit -  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. . . Circuit by David Johnson P.E.-June, 2000

Remote Fan Control -  November 09, 2011Design News:  The gadget comes with off/on, three fan speeds, and multicolored LEDs to indicate the fan’s speed.  As a bonus, it beeps to indicate that the fan got your message.   __ Designed by Andrew R. Morris, Gadget Freak-Case #198, Design News

Remote Half Bridge Digitizer Platinum RTD with Noise Suppression on Reference -  The LTC2414/LTC2418 are 8-/16-channel (4-/8-differential) micropower 24-bit ΔΣ analog-to-digital converters.  They operate from 2.7V to 5.5V and include an integrated oscillator, 2ppm INL and 0.2ppm RMS noise.  They use delta-sigma technology and provide single cycle settling time for multiplexed applications.  Through a single __ Linear Technology/Analog Devices App Note, Mar 30th 2010

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.  Figure 1 shows a simple way to remove the power source from the humidity-sensor circuit __ Circuit Design by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India

Remote Infrared Terminal -  This unit provide 2 way IR communications using a numeric keypad and an LCD display.  Data is sent and recieved in ASCII with no regard to what the data means to any particular device __ Designed by Luhan Monat-Mesa Arizona

Remote LED Annunciator -  IN THE BAD OLD DAYS, anyone rolling up at a department-store deli to buy a few slices of salami or whatever had to muscle their way through the crowd and try to attract the attention of a salesperson or they’d never get served.  It was much the same at employment offices and medical scanning departments, where the rudest and most obnoxious people were often attended to first.__ SiliconChip

Remote Monitoring System Sends E-mail via SMS  -  This App 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__ Maxim Integrated

Remote Motor Controller -  You want to turn the variable capacitor of the antenna tuner near the antenna from the inside of your shack.  You might then use a stepping motor attached to the variable capacitor and turn it with a digital controller.  I actually did the same with a PIC micro controller before. __ Designed by MINOWA, Makoto  7N3WVM

Remote Operated Home Appliances Circuit -  Suitable for operating, Lamps, Fan, Radio etc.., Small n easy unit Here is the circuit diagram of Remote Operated Home Appliances or Remote controlled 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, VCR, Air Conditioner or DVD remote

Remote Phone-Bell Ringer -  Did you ever miss an important telephone call simply because you were away where you couldn't hear the phone ringing? This should not happen again with this inexpensive remote telephone bell....__ Electronics Projects for You

Remote Range Extender TV/VCR -  I often get frustrated by how poor some infrared remotes in many new electronic devices operate.  I used to be able to turn on the TV from 30 feet away.  Now, it seems that I have to get within 15 feet.  To address this issue, I designed the circuit shown below.  The circuit taps into the TV remote’s existing infrared LED and drives 8 more efficient devices.  The result is a communications range some 4 to 5 times longer. . . . Hobby Circuit designed by David A. Johnson P.E.-December, 2000

Remote Relay -  Switch mains voltages safely with this easy-to-build unit__ SiliconChip

Remote Relay Driver -  I received a call from a Discover Circuits visitor who wanted a simple way to turn on an outside lighting system using a low voltage control line.    I suggested the simple circuit below.    The circuit is powered by a 9v battery and uses a very efficient latching relay.    Two low voltage wires lead from the a toggle switch to the remote relay.    A toggle switch selects either the on or off condition of the relay.    The relay contacts are rated at 10 amps, so the small relay can handle a sizeable amount of power.. . . Circuit by David Johnson P.E.-April, 2014

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

Remote RF Xmiter -  This device was built into a small (1 1/4 by 2 inch) Radio Shack project box.  It features four push buttons which can produce 2 codes each.  (Pushing a button for less than one second sends the first code, holding it for over one second sends the second code.)  __ Designed by Luhan MonatMesa Arizona

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 __ Designed by G. Forrest Cook

Remote Switch Uses No-Power Fiber-Optic Link -  10/10/96 EDN-Design Ideas The heavy-duty switching device in Figure 1 counts the number of products manufactured and rolled out of a production line per hour.  The switch is useful for counting rolling heavy objects or materials weighing one to several thousand kilograms.  It generates one pulse per __ Circuit Design by Shyam Tiwari, IGKAR, Kalpakkam, India

Remote Telltale for Garage Doors -  If you have a perfect memory you won't need this.  But the rest of us could find it very handy! It lets you know if you've left the garage door open without stumbling out in the dark or the pouring rain...__ SiliconChip

Remote Temp Sensor Needs No Power Supply -  12/21/95 EDN-Design Ideas Measuring temperature at a remote location is a common requirement, but the implementation is usually not straightforward.  Most temperature sensors have a voltage or current output, which, to minimize noise pickup, should undergo conversion to digital form near the sensor.  Thus, an ADC, a digital interface, and a power supply must all be situated at the temperature-measurement point.  The circuit in Figure 1 monitors the temperature at a remote location and transmits that temperature to a host computer. __ Circuit Design by Wes Freeman, Analog Devices Inc  Santa Clara, CA

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.  

Remote TV Camera Power -  A while back I received an email from a company with a problem.  They needed a security camera installed at some remote location.  The camera was a high quality color camera sending out standard NTSC video through a long 500 foot 50 ohm coax cable.  With some difficulty they got the coax strung.  They were told that there would be AC power near the camera location to power that device.  But, they then learned that in fact, there was no power available.  They thought about using a solar panel and a battery but they decided to call me for help instead.  Was there some way to power the camera without stringing another cable? . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2011

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.  __ Golab.com

Remote Volume Control & Preamplifier Module -  This up-to-date control module works with any universal infrared remote and features a blue LED readout and an optional rotary encoder.  Its ability to both attenuate and amplify means that it can operate as a simple volume control or as a high-performance stereo preamplifier!__ SiliconChip

Remote Volume Control for Stereo Amplifiers -  You can add a remote motorised volume control to just about any stereo amplifier.  Here's how to do__ SiliconChip

Remote Volume Control for the Ultra-LD Amplifier -  Revised preamp board lets you add our remote Volume Control unit to the Ultra-LD Stereo Amplifier__ SiliconChip

Remote Volume Control Part 2 -  Second article completes the construction & gives the set-up procedure__ SiliconChip

Remote-Alert -  Remotely-operates a Beeper and/or a LED via mains supply line __ Contact: IQ Technologies

Remote-Controlled 6-Camera CcTV Switcher -  Closed-circuit television (CCTV) uses video cameras to transmit signals to specific monitors.  It differs from broadcast television in that the signal is not openly transmitted, though it may employ point-to-point wireless...__ Electronics Projects for You

Remote-Controlled Fan Regulator -  Using this circuit, you can change the speed of the fan from your couch or bed.  Infrared receiver module TSOP1738 is used to receive the infrared signal transmitted by remote control.__ Electronics Projects for You

Remote-Controlled Fan Regulator -  Using this circuit, you can change the speed of the fan from your couch or bed.  Infrared receiver module TSOP1738 is used to receive the infrared signal transmitted by remote control.  The circuit is powered by regulated 9V.  The AC mains is stepped down by transformer X1 to deliver a secondary output of 12V-0-12V.  __ Learning Electronics

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Control Circuits:   #'s - A       B - C       D - G        H - L       M - P        Q - S        T - U        V - Z


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