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Weather Station - Weather station with pressure reading, relative humidity, indoor remote outdoor temperature display. Both Celsius or Fahrenheit mbar/hPa or mm Hg supported. With calendar clock. Easy 3-button user-menu.42 hour-history display (curve). Auto-memory __ Designed by Radio LocMan Weather Logger - Presented here is a personal weather logger whose various transducers are used to log weather data such as humidity, atmospheric pressure and temperature. The data is transferred to PC where it...__ Electronics Projects for You
Weather Station - Weather station with pressure reading, relative humidity, indoor remote outdoor temperature display. Both Celsius or Fahrenheit mbar/hPa or mm Hg supported. With calendar clock. Easy 3-button user-menu.42 hour-history display (curve). Auto-memory __ Designed by Radio LocMan
Weather station with pressure reading, relative humidity, indoor & remote temperature reading - Weather station with pressure reading, relative humidity, indoor & remote outdoor temperature display. Both Celsius or Fahrenheit & mbar/hPa or mm Hg supported. With calendar & clock. Easy 3-button user-menu.42 hour-history display (curve). Auto-memory & display of all high and low-values. PIC 18F452 running at 4 MHz, sleep mode. __ Designed by Michel Bavin
Weather-Forecast Monitoring System - Weather forecasts play an important role in our day-to-day life. A good weather monitoring system helps in better planning and any preparations that may be required in case of adverse weather. This...__ Electronics Projects for You
Web-Based Water-Level Monitor & Pump Controller - Several articles about water-level controllers for overhead tanks have been published in earlier issues of EFY magazine. But the project we are going to share today is new and unique. So...__ Electronics Projects for You
Weekend Projects with Bre Pettis: Make a Joule Thief - it's a little wisp of a circuit that allows you to drive a blue or white LED from a low voltage. Normally, if you want to light up a blue or white LED you need to provide it with 3, 3.5 V, like from a 3 V lithium coin cell. But a 1.5 V battery like a AA cell simply will not work. But using the Joule Thief, it works like a charm. Not only does it work with a brand new battery, but it works until the battery is nearly dead-- down to 0.3 V. That's well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name). To learn how to make one, watch the video, which is available in a variety of formats. __ Evil Mad Scientists Laboratories
Weighting Filter - Weighting filters are used to determine the "loudness" of sounds, particularly noise. You can very much discuss and criticise sense and nonsense of different weighting filters. __ Designed by Uwe Beis
Weller WLC100 Electronic Soldering Station - One day you switch on your soldering station (in my case a Weller WLC100). You flick the switch and the red light comes "ON", indication power is okay. Ten minutes later you get ready to solder and find the soldering pencil is not hot at all. What the?! After the usual frustration period of confusion and bad words you decide to investigate and fix the problem. After all, you are a techie or technical inclined and you can 'fix anything'. Right?. __ Designed by Tony van Roon VA3AVR
Wet Bulb Psychrometer - The LTC2990 is used to monitor system temperatures, voltages and currents.__ Linear Technology/Analog Devices App Note, Oct 26th 2010
Where is the wiper? - 08/08/02 EDN Design Ideas: You enjoy significant advantages when using DPPs (digitally programmable potentiometers] with increment/decrement serial interfaces. Programming the serial interface is simple and fast, and you can adjust the potentiometer in real-time applications. The interface, however, provide as no information about wiper position, and this information is important in some applications Design by Chuck Wojslaw and Dave Gillooly, Catalyst Semiconductor, Sunnyvale, CA
White LED is Powered By One NiMH
Cell - There are a lot of white LED driver circuits floating around. A popular circuit called the “Joule Thief” can drive one white LED from a single 1.2v or 1.5v battery cell. Most of these circuits use one or two transistors to form a voltage boost circuit. . . Circuit by David Johnson P.E.-September, 2009
White LED Light Probe for Inspection - This circuit is useful for inspecting narrow spaces like the inside of the CPUs, monitors, PCB modules and other electronic devices. The light source is a pencil-thin tube with ultra-bright white...__ Electronics Projects for You
White LED Night Light - This simple circuit is designed to plug into a standard AC electrical outlet. it uses four super bright white light emitting diodes (LED) in conjunction with a capacitor coupled full wave rectifier circuit. The LEDs are mounted in a box and are angled slightly to bounce the light off of a nearby wall. . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2003 White LED Lifetime Tests - All white LEDs fade over time. I find that some LEDs fade in intensity very rapidly while others fade more slowly but every one I have tested would be worthless in a few months to a year. To speed up the testing process I have modified my constant current LED driver circuit as shown below. . . Dave Johnson, Lubbock TX-DC Magazine - Issue 7 Mar 2010White LED Night Light - This simple circuit is designed to plug into a standard AC electrical outlet. it uses four super bright white light emitting diodes (LED) in conjunction with a capacitor coupled full wave rectifier circuit. The LEDs are mounted in a box and are angled slightly to bounce the light off of a nearby wall. . . . Hobby Circuit designed by David A. Johnson P.E.-July 27, 2003
White's SurFMaster PI (pulse induction) metal Detector schematic diagram - White's Surfmaster PI is a good quality, fully waterproof, lightweight metal detector with an exceptional depth in saltwater or mineralized ground. it's ideal for those wishing to search beaches, in the surf or shallow diving. it works inland too, but such use is not advised as -- like all PI (Pulse induction) designs -- there is no effective discrimination of ferrous objects. Runs on eight AA size batteries. __ Contact hobbyteam @ hobby-hour.com
Wide dynamic range Field Strength Meter mark I - When direction-finding in close quarters, fancier direction-finding gear (if you have it) can become useless due to very strong reflections. in addition, it may be large, cumbersome, and very conspicuous. At this point one is often very close to the transmitter itself and it's just a matter of figuring out exactly which tree the transmitter is hidden in or which car has the radio with the stuck microphone. __ Designed by Clint Turner, KA7OEI
Wide dynamic range Field Strength Meter mark II - When direction-finding in close quarters, fancier direction-finding gear (if you have it) can become useless due to very strong reflections. in addition, it may be large, cumbersome, and very conspicuous. At this point one is often very close to the transmitter itself and it's just a matter of figuring out exactly which tree the transmitter is hidden in or which car has the radio with the stuck microphone. __ Designed by Clint Turner, KA7OEI
Wide Input Range 10W PWM Heat Source - The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current proportional to instantaneous power. Bidirectional high side currents and bipolar voltage differences are correctly handled by the four-quadrant multiplier and push-pull output stage, which allows the LT2940 to indicate__ Linear Technology/Analog Devices App Note, Apr 26th 2010
Wide-swing Variable Crystal Oscillator - amateur radio construction projects. __ Designed by Peter Parker
Wind Direction & AirFlow Measurement - The LTC2990 is used to monitor system temperatures, voltages and currents. Through the i2C serial interface, the device can be configured to measure many combinations of internal temperature, remote temperature, remote voltage, remote current and internal VCC. The internal 10ppm/°C reference minimizes the number of supporting __ Linear Technology/Analog Devices App Note, Mar 16th 2011
Wind gauge - On this page, I will introduce the wind gauge using PIC . There are various methods of measuring the speed of a wind. With this equipment, a hemispherical window cup is rotated and the method of measuring wind velocity at that number of rotations is used. The measured number of rotations is sent to a personal computer with a USB interface, and wind velocity is displayed on a screen. __ Designed by Seiichi Inoue
Wind speed logger - This wind logger project was designed to help a friend who wants to log wind speed for one year. it uses an inexpensive cup anemometer from Biral (see photo, left) available here in the UK. The anemometer contains a reed switch with rotating magnets which produce two switch closures per revolution of the cup assembly. __ Designed by Hans Summers
Wind speed logger Mk2 - Following quick on the heels of the Mk1 Windlogger project, I had built this new version which incorporates a host more features. The new version includes datalogging to an SD-card with Date/Time stamp as well as an onboard temperature sensor and light intensity sensor. External analogue inputs allow for logging wind direction too if your anemometer supports it. __ Designed by Hans Summers
Wire Loss Compensation using a Current Referenced LDO - This circuit shows a cable drop compensation circuit using a current referenced regulator, the LT3080. A precision 10μA set current, iSET, is sourced through two series connected resistors to program the output voltage for the remote load. To compensate for the load connecting cable drop requires sourcing an additional __ Linear Technology/Analog Devices App Note, Jun 19th 2013
Wireless Auto Tachometer - Anyone performing their own automobile tune-ups knows how important it is to know your engines speed. With this tachometer, you can measure your engines speed without any connections or annoying timing lights. __ Designed by Aaron Cake
Wireless Digital Thermometer for Multiple Sensors - A lot of remote sensing thermometers have a problem with measuring more than one temperature at a time. To overcome this problem, a different technique is adopted here, which allows you to...__ Electronics Projects for You
Wireless MultiMeter - The WMM (Wireless MultiMeter) comes as a KiT. One half consists of a modified DMM (Digital MultiMeter) which transmits wireless data through a TX circuit. The second part is a wireless receiver with LCD (see picture) to show the remote data. __ Designed by Michel Bavin
Wireless Temperature & Humidity Sensor with USB - this project is based on obdev's Remote Sensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor__
Wireless Temperature Monitor Has Data-Logging Capabilities - 01/19/12 EDN Design Ideas: You can make a wireless temps system with two IC s. You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless temperature-monitoring system with data-logging capabilities. A microcontroller processes and displays the temperature reading to the user. The microcontroller’s onboard UART (universal asynchronous receiver/transmitter) also allows for data-logging applications Design by Tom Au-Yeung and Wilson Tang, Maxim Integrated Products, Sunnyvale, CA
Wireless Volume Control - 17-Aug-11 -Design News: Andrew Morris decided the usual wireless volume controls don’t offer enough functionality, so he created the ultimate volume control that connects between a computer or MP3 player and an amplified speaker system. __ Designed by Andrew R. Morris, Gadget Freak-Case #192
Wireless Weather Station. Part 1 - in the Midwest, the main topics of conversation may include the local football team or how the crops are doing. inevitably though, the conversation always leads to the weather. Most of us take the weather for granted __ Designed by Jerry Wasinger
World's Smallest Geiger Counter - The following two circuits are an improvement over the older circuits below. The circuits are shown generating 500 volts but they may be modified to supply a couple of hundred to nearly 1000 volts by changing the zener diodes. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
X Clock Lightning Detector - Schematic + info + pictures __ Designed by Lennie Zink
X100 Scope Probe - Often a typical X10 oscilloscope probe will produce large measurement errors and will influence the circuit operation. To reduce the effect such a probe has on the circuit, I reach for my X100 scope probe, with its 100M impedance. This probe is a commercially made device but if you want to make one, it is not hard to do.. . . Circuit by David A. Johnson P.E.-May, 2010
XCam-FSM - Add a signal strength meter to your XCam receiver. A digital display tells you the relative signal strength of the received video broadcast. __ Designed by T. Black
Xmas Lights Tester - Like every year around the same time, I hurried to get my Christmas tree all set up and the first thing we do when the tree is 'standing' we like to hang the lights in the tree. Okay, better first test them before putting all 50 of them in the tree. Yep! Working beautifully. I started a carefully planned organization of the lights so they would be evenly divided over the branches. Now the second string of lights, tested, yep working. in the tree with them. Putting the plugs into the receptacle andoh no-- one series of them are on in full glory, all the others are out. Annoyed I tried to 'fix them' by trying to push each bulb further into their sockets. Still no go __ Designed by Jan Hamer
XTal Tester - This is a simple XTal tester circuit. T1 and XTal have formed an oscillator. C1 and C2 are voltage divider for oscillator. if the XTal is safe, the oscillator will work well and its output voltage will be rectified by C3, C4, D1 and D2, then T2 will run and LED will light. The circuit is suitable to test 100KHz - 30MHz Xtal. __ Contact IQ Technologies
XTAL-Controlled FM TX (V6) - My FM Wireless microphone V5 has been very popular, both as a beginners project and as a kit. it is interesting that it has also been the biggest cause of lots of e-mail, the most common question being How can I make it crystal controlled?. The oscillator can be made crystal controlled; replace the 2p7 with a 5th harmonic crystal. The oscillator will then be very stable, so stable in fact, that it cannot even be modulated! This means that you could only use it to send CW (morse code) __ Designed by Harry Lythall-SM0VPO
Yoga Breathalyzer - 13-Jun-14 -Design News: The yoga breathalyzer is a breath visualization tool to help you understand get in touch with your breathing. __ Gadget Freak-Case #256
Z80 controlled Viscometer project - in the summer holidays of 1992, I worked in the Tribology group in the department of mechanical engineering at imperial College, University of London where I had just completed the 2'nd year of my Physics degree. The group were concerned with lubrication and my particular task was to test the viscosity of synthetic lubricants. The lubricant had to be heated to 250 degrees centigrade and have oxygen bubbled through it, then I had to take viscosity measurements every 30 minutes until the lubricant gave up and became solid. __ Designed by Hans Summers
Zapper for Electrotherapy - NOTE: Must register on this site __ Designed by Published in Elecktor July/Aug, 2010
Zener diode & MM ICs produce true broadband noise - 10/14/99 EDN Design Ideas: A broadband source of white noise can be useful for measuring and testing communications equipment. The source in Figure 1 is simple and produces a large noise signal at its output terminals. The circuit Design by Lukasz Sliwczynski, University of Mining and Metallurgy, Institute of Electronics, Krakow, Poland
Zener Diode Emulator-WA5EKA - Schematic only __ Designed by va3iul
Zener Diode Protects FPGA Inputs - in a pinch, a Zener diode can save time and prevent a board redesign. Design by Rick Collins, Arius, Frederick, MD
Zener Diode Tester - This zener diode tester can be used to check zener diodes of 3.3V to 18V. The breakdown voltage of the unknown zener diode is indicated on the precalibrated dial of potmeter...__ Electronics Projects for You
Zener Diode Tester - This circuit will test zener diodes up to 56v. See Talking Electronics website, left index, 200 Transistor Circuits (circuits 1-100) and go to Zener Diode (making) to see how to make a zener diode and how to create a zener voltage from a combination of zeners. __ 555-Timer
Zener diode tester based on a 555 timer - Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the LT700 __ Designed by Andy Collinson & Aleksander Dakic
Zener test serves as DC source - 11/25/04 EDN Design Ideas: This design idea describes a versatile test circuit for zener diodes after yet another misread zener diode had infiltrated the ranks of 1N4148 diodes assembled on a pc board. As a bonus, the circuit can serve as a moderate-voltage, Design by John Jardine, JJ Designs, West Yorkshire, UK
Zener tester - if no zener (D2) is connected across C1 and S1 is switched on, the output rises rapidly to 45V DC. This voltage can be measured with a DVM. When an unknown zener is connected across C1, output will be equal to the zener voltage. if a normal diode (or a zener diode with zener voltage > 45 V) is hooked up, the DVM will measure 45 V. if a diode is connected with the wrong polarity, the meter will indicate 0.6 or 0.7 V (even lower if the diode is a germanium or Schottky type). __ Designed by Aren van Waarde
Zener Value Evaluator - Using this simple circuit and a known-value zener diode, you can find the breakdown voltage value of any zener diode. The circuit is divided into two sections: zener evaluator and display...__ Electronics Projects for You
Zener/SCR/TRIAC Tester - I built a zener tester and modified it to test SCRs and TRIACs. __ Designed by Lennie Zink |
