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Ultra Low Power LCD Indicator - This circuit serves as an ultra-low power replacement for multiple LED on-off indicators. it also has the advantage of being easy to read in full daylight. With the parts shown, it is possible to display four bits of information. __ Designed by G. Forrest Cook
Ultraprecise Current Sensing with LTC6102 - Very low input offset allows using low value resistors while maintaining high measurement resolution. Using low value also reduces power losses and temperature rise. __ Linear Technology/Analog Devices App Note, Jul 2, 2012
Ultra-Simple Circuit Voltage Probe - Detects 1.8 to 230 Volts DC or AC Minimum parts counting. Circuit diagram: Parts: D1 5 or 3mm. Red LED D2 5 or 3mm. Green or Yellow LED LP1 220V 6W Filament Lamp Bulb P1 Red Probe P2 Black Probe Device purpose: This circuit is not a novelty, but it __ Designed by Flavio Dellepiane
Ultrasonic Distance Measurement with the MSP430 (PDF) - This application report describes a distance-measuring system based on ultrasonic sound utilizing the MSP430F413 ultralow-power microcontroller. The system transmits a burst of ultrasonic sound waves towards the subject and then receives the corresponding echo. The MSP430 integrated analog comparator Comparator_A is used to detect the arrival of the echo to the system __ Designed by TI Application Report SLAA136A - October 2001
Ultrasonic Distance Measurer - Linear measurement is a problem that a lot of applications in the industrial and consumer market segment have to contend with. Ultrasonic technology is one of the solutions used by the industry. However, an optimized balance between cost and features are a must for almost all target applications__
Ultrasonic distance meter using raspberry pi 2 - Ultrasonic ranging module HC-SR4 provides 2cm to 4cm non-contact distance measurement range. its accuracy can reach ±3mm__ Arnav Bansal
Ultrasonic Distant Obstacle Detector - The first sensor a robot usually gets fitted with is an obstacle detector. it may take three different forms, depending on the type of obstacle you want to detect and also — indeed, above all — on the distance at which you want detection to take place. For close or very close obstacles, reflective iR__
Ultrasonic Proximity Detector - We the humans can hear sound of up to 20kHz frequency only. This proximity detector works at a frequency of 40 kHz. it uses two specially made ultrasonic transducers: One transducer...__ Electronics Projects for You
Ultrasonic Proximity Detector 2 - This ultrasonic proximity detector comprising independent, battery-powered transmitter and receiver sections makes use of a pair of matched ultrasonic piezoceramic transducers operating at around 40 kHz each. This circuit can be...__ Electronics Projects for You
Ultrasonic Range Meter - On these pages, I will introduce the Ultrasonic Range Meter with PIC 16F873. As for the range meter which doesn't use PIC , refer to "Ultrasonic Range Meter". I created the PCB pattern for this circuit using EAGLE CAD. With this circuit, the following features of PIC 16F873 are used. __ Designed by Seiichi Inoue
Ultrasonic Water Tank Level Gauge - Do you have a tank to collect rainwater? Do you know how much water is in it? This ultrasonic tank level gauge fires an energy burst which bounces off the surface of the water ? and then a microcontroller calculates how far down the tank water level is. Clever, eh! __ SiliconChip
Under/Over Voltage Alarm on AC Line - Power lines, which deviate much beyond normal voltages can damage expensive electronic equipment. The circuit below sounds an alarm whenever the line voltage is higher or lower than normal. I set the alarm limits at about +-15% from standard levels. . . Circuit by Dave Johnson P.E.-March, 2009
Underground Locator Generator - Schematic Only for radiodetection® rd400 llts precision line trace unit (underground cable locator) (16f628) __ Designed by Jon Fick
Understanding & selecting RMS voltmeters - 05/11/00 EDN Technical Article: Failing to verify ac-voltmeter accuracy before conducting rms-noise measurements may cause highly misleading results. Design by Jim Williams and Todd Owen, Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke. He was 63.
Understanding Electricity-an analogy with water - (good start for beginners) __ Designed by Richard Torrens
Universal frequency counter & voltage meter - For the purpose to be used with QRP transceivers I have developed some frequency counters with different types of displays (from simple 8 LED display to 2 x 8 character LCD) , but the f-counter described on this page I have found to be the most useful. The requirements I wanted to fulfil with this design __ Designed by Aleksander Stare
Universal IR Remote Control Tester - This tester consists of two integrated remote control receivers whose outputs drive an LED to indicate when a suitable infrared signal is received. To cover all current infrared remote controls, one receiver (the TSOP1736) has maximum sensitivity to carriers at 36 kHz, the other (the TSOP1738) to carriers at 38 kHzmust register on this site __ Designed by Published in Elecktor July/Aug, 2010
Unplugged Power Cord Alarm - Many medical devices, such a portable X-ray and ultrasound equipment, carry their own batteries. However, the frantic pace of some hospital emergency rooms might cause the device to be shoved off into a corner without being plugged back into an AC power source to recharge their batteries. So, I designed this circuit to emit an audible alarm whenever the device’s power cord was unplugged from the wall for a period of time. . . Circuit by David Johnson P.E.-July, 2000
Unusual clock with AT89C2051 - interesting worked out example of clock with only 7 lad's - published in magazine "Svijet elektronike" Nr.46 ( June / July 2004) Author: ivica Novakovic __ Designed by © Ivica Novakovic
USB 2.0 temperature sensor needs only a handful of parts - 05/24/07 EDN Design Ideas: A USB-to-serial converter forms the heart of an accurate USB temperature sensor Design by Silvio Lauckner, Ismaning, Germany
USB link neatly measures temperature - 26-Oct-00 EDN Design Ideas: Figure 1 shows a convenient and neat way to measure temperature using the USB of a PC. An ADM1023 IC senses the temperature, and an Anchor Chips EZ-USB. PDF contains several circuits, scroll to find this one. Design by Mary Burke, Analog Devices, Limerick, Ireland
Use a heated diode as a Flow sensor - 12/23/13 EDN Design Ideas: A hot diode senses air or fluid flow Design by Raju Baddi
Use a PC's parallel port to program a clock source - 12/07/04 EDN Design Ideas: This Design idea shows how you can use Linear Technology's LTC6903 programmable oscillator as a clock source for direct-digital synthesis, data conversion, switched-capacitor filtering, clock, and voltage-controlled oscillator circui Design by William Grill, Honeywell BRGA, Lenexa, KS
Use a Photoelectric-FET Optocoupler as a Linear Voltage-Controlled Potentiometer - 01/19/12 EDN Design Ideas: The circuit takes advantage of an identical photo-FET as a feedback element. You can use a photoelectric FET as a variable resistor or a potentiometer in combination with a fixed resistor. The H11F3M photoelectric FET has an isolation voltage of 7.5 kV, enabling you to safely control highvoltage circuit parameters. The nonlinear-transfer characteristics of these devices are problematic, however (Figure 1). To correct the nonlinearity, using a simple feedback mechanism as a potentiometer yields a linear response (Figure 2). This circuit uses two photoelectric FETs—one for feedback and the other for applications requiring an isolated potentiometer. You connect the inputs of the two photoelectric FETs in series to ensure the same amount of current for the input LEDs. Design by Sajjad Haidar, University of British Columbia, Vancouver, BC, Canada
Use a PWM fan controller in an EMI-susceptible - 02/16/06 EDN Design Ideas: Control it with either an external negative-temperature-coefficient thermistor or a PIC microcontroller and its SMBus serial-data bus Design by Dimitri Danyuk, Niles Audio Corp
Use a switching-regulator controller to generate fast pulses - 04/13/06 EDN Design Ideas: Switching-regulator-controller ICs can deliver gate-drive pulses with rise and fall times of less than 2 nsec, making them ideal candidates for laboratory pulse-generators Design by Mitchell Lee, Linear Technology Corp
Use a Transistor & an AM meter to Measure Inductance - 04/05/12 EDN Design Ideas: Bipolar junction transistors transfer a current from a lower-resistance emitter to a higher-resistance collector. You can use this property to measure inductance. Design by Raju Baddi, Tata Institute of Fundamental Research, Pune, India
Use AIR-Core-Coil Resistance to Estimate Inductance - EDN-Design ideas -- 01/05/12 if the coil is tightly wound you do not need the number of turns to calculate inductance. Design by Peter Demchenko, Vilnius, Lithuania
Use op-amp injection for Bode analysis - 16-Sep-04 EDN Design Ideas: Bode analysis is an excellent way to measure small-signal stability and loop response in power-supply designs. Bode analysis monitors gain and phase of a control loop. it performs this monitoring by breaking the feedback loop and injecting a signal into the feedback node and then comparing the injected signal with the output signal of the control loop Design by Martin Galinski
Use RS-232C port to measure pressure - 08/01/97 EDN Design Ideas: A simple circuit and accompanying software turn a pressure sensor into an accurate and cheap pressure digitizer that works with any PC's RS-232C COM port. Many manufacturers make micromachined silicon piezoresistive pressure sensors Design by W Stephen Woodward, University of North Carolina--Chapel Hill
Use Thermoelectric Coolers with Real-World Heat Sinks - 04/17/08 EDN Design Ideas: When using a Peltier thermoelectric cooler with a less-than-perfect heat sink, you must derate the maximum voltage and current applied to the cooler Design by W Stephen Woodward, Chapel Hill, NC
Use Thermostat as 12 Volt Timer - Find out how an old battery powered thermostat can be used as a low voltage automatic timer. __ Designed by REUK-Renewable Energy UK website
Use your printer port as a high-current AM meter - 07/06/00 EDN Design Ideas: With a few inexpensive components and iNT1Ch, you can turn the printer port of your PC into a high-current ammeter. Design by K Suresh, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
Using the LTC1325 Battery Management Ic - AN64 App Note 64 details characteristics of various battery types and appropriate charging management schemes. The LTC1325 battery management IC is highlighted along with information for applying it to any type battery. Techniques and circuitry for conditioning, charging and monitoring NIC d, NiMH
, Li-ion and Lead-Acid batteries are presented. __ Linear Technology/Analog Devices
UTP Cable Tester - Warning! This design is some 16 years old by now. Although it will still work, I recommend you to buy a ready made cable tester, unless you enjoy building one your self, even if it'll cost you much more than one you can buy ready made. __
UVP protects rechargeable batteries - EDN Design Ideas: 04/11/2016 Protect rechargeable batteries from deep discharge with this UVP & load switch. Design by Peter Demchenko |
