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One Amplifier has two gain figures - 09/19/02 EDN Design Ideas: The single-supply circuit in Figure 1 is an inverting amplifier with two outputs—one for positive output voltages, VOUT (POS], and the other for negative output voltages, VOUT (NEG]. Steering diodes D1 and D2 split the amplifier, IC 1, output into the two output polarities relative to the 2 Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA
One chip Detects optical interruptions - 03/01/01 EDN Design Ideas: Setting up a light beam and detector to count objects on a conveyer belt, sense security intrusions, or drive a tachometer is simple. However, the task is no longer trivial if you add ambient light or multiple beams, limit optical power, or extend the dis Design by Frederick M Baumgartner, FM Broadcast Services, Parker, CO
One Hex-Inverter IC Makes Four Test Gadgets - 07/30/12 EDN Design Ideas: This can be a fun project for students and seasoned engineers alike. Design by Raju Baddi
One IC forms inexpensive inductance tester - 08/02/07 EDN Design Ideas: A simple Pierce oscillator measures the inductance of a device under test Design by Luca Bruno, ITIS Hensemberger Monza, Lissone, Italy
One IC Forms Precision Triangular-Wave Generator - 04/08/10 EDN Design Ideas: Generate a triangular wave for testing other circuits. Design by Akshay Bhat, Maxim Integrated Products Inc, Sunnyvale, CA
One NiMH
Cell powers White LED - 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 . . . Hobby Circuit designed by David A. Johnson P.E.-September, 2009
One Shot (D-Flip/Flop) Circuit - Yes you can use cheap D flip/flop logic circuits as nice one-shot pulse generators. This schematic shows how the popular CD4013 and the CD74HC74 can be used to generate pulses ranging from nanoseconds to seconds. . . Circuit by David A. Johnson P.E.-June, 2000
One switch controls digital potentiometer - 09/19/02 EDN Design Ideas: This design idea is an evolution and simplification of another (Figure 1, Reference 1]. Replacing the three inverted-input NOR gates with their logical equivalents, positive-input NAND gates, makes these three gate symbols consistent Design by Jim Bach, Delphi Delco Electronics Systems, Kokomo, IN
One Wire Barometer - OWW is an application for Linux and RISC OS
to drive the 1-wire weather station. . . . Designed by Simon
Melhuish
One wire bus powers water level sensor - 02/15/00 EDN Design Ideas: remotely monitor the level of liquid water in a vessel such as a swimming pool Design by Dale Litwhiler, Lockheed Martin, Newtown, PA
Oneshot & Latch Pushbutton - This circuit uses a single IC to convert a noisy pushbutton switch signal into a clean pulse or a sustained push on-push off signal. it can operate from 3v to 18v . . . Hobby Circuit designed by David Johnson P.E.-March, 2002
One-wire bus powers water-level sensor - 02/15/00 EDN Design Ideas: remotely monitor the level of liquid water in a vessel such as a swimming pool Design by Dale Litwhiler
On-Off Temperature Control - This circuit controls a load (in this case a dc brushless fan) based on a temperature compared with a setpoint. THe transduced is a diode in the forward polarization regime. in fact when forward biased, the forward voltage drop accross a diode has a temperature dependance, in particular has a negative linear (ish) slope __ Contact Jonathan Filippi
Op Amp Comparator & Reference IC provides miscropower Monitoring capability - Design Notes 190__ Linear Technology/Analog Devices
Op Amp increases potentiometer's resolution - 06/05/00 EDN Design Ideas: A key parameter of digitally controlled potentiometers (DCPs] is the number of taps (n] programmable positions of the wiper. This parameter establishes the resolution in programmable-voltage and -current applications. A number of circuitPDF has many circuits, please scroll to find this one Design by Chuck Wojslaw, Xicor Inc, Milpitas, CA, and P Gareth Lloyd, Elab Ltd, Stoke-on-Trent, UK
Opamp Design & Test Board - Quickly assemble an OpAmp circuit for testing. Very easy and intuitive to use __ Designed by Rod Elliott ESP
Op-Amp Rectifier Signals Input State - 07/21/94 EDN Design Ideas: The op-amp rectifier in Fig 1 operates from a single supply and provide as a logic output and an LED that indicate the state of the input voltage. The input-state indications are handy for calibration. Because the circuit operates from a single supply, the 2.5V reference determines the level around which the circuit rectifies input waveforms Design by Lee E Scaggs, High Country TEK, Nevada City, CA
OpenEEG open hardware EEG project - Medical and health related electronic circuit diagrams / circuit schematics__ Optical Fiber Pressure & Motion Test - The circuit uses an off-the-shelf bright red LED light source, designed for plastic optical fibers. It also uses a matching phototransistor light detector. The devices are designed for plastic fiber. I would suggest you keep the total fiber length less than 50 feet. Bending or stepping on the fiber will produce a detectable output signal. . . . Dave Johnson, Lubbock TX-DC Magazine - Issue 15 Jan 2011Optical Heart Rate Monitor - Medical and health related electronic circuit diagrams / circuit schematics__
Optical Heart Rate Monitor Reference Design with BLE Connectivity - This reference design is for a complete Optical Heart Rate Monitor wrist watch (no chest strap!) end equipment featuring TI signal chain, power, and connectivity components. With Ti’s AFE4400 AFE, you can accelerate and simplify your wrist based HRM design while still ensuring measurement performance needed for serious Fitness designs. This reference design also includes a full BLE connectivity design for easy interface to BLE enabled smartphones, tablets, etc.__ Texas Instruments
Optical RFID Test Circuit - I designed this test the concept of using light techniques to send identification data instead of RF.. . . Circuit by Dave Johnson P.E.-February, 2002
Optical Smoke Detector - This optical smoke detector uses a low-cost, readily-available, slotted, through-scan, infrared photo-switch. When smoke is detected, the relay energises to activate the audio/visual warning alarm. Fig.1 shows the circuit of the...__ Electronics Projects for You
Optical tachometer provides bidirectional info - 05/21/98 Design ideas - (Multiple circuits listed, scroll to find this one) Optical tachometers have many advantages in precision servo applications. Compared with dc-generator types, optical tachs are relatively inexpensive and, because they lack wear-prone commutator brushes, they're long-lived. Frequency-to-voltage conversion circuits provide a convenient means to integrate the output of optical tachs into analog, unidirectional motion-control loops. However, for bidirectional servos, where you need a bipolar angular-velocity readout, you need a more unconventional solution, such as the circuit in Figure 1. Design by Stephen Woodward, University of North Carolina, Chapel Hill
Optically Isolated Overcurrent Detector Works From AC Mains - 10/06/11 EDN Design Ideas: The circuit uses two opto-transistors you arrange for bipolar sensing. The circuit in this Design idea detects short-circuit faults or excess-current conditions in line-operated equipment, such as a UPS (uninterruptible power supply) , across an isolation boundary. if the load current rises higher than a predetermined level, the circuit generates a 5V pulse to immediately shut down the power inverter. This compact circuit provide as a reliable means for protecting power semiconductors and batteries against overcurrent conditions. it features an isolated output and a fast response. The ac mains self-power the sensing network. Design by José M Espí, Jaime Castelló, Rafael García-Gil, and Marcos Arasa, University of Valencia, Valencia, Spain
Optimize linear-sensor resolution - 03/07/02 EDN Design Ideas: A wide variety of sensors and transducers of physical phenomena work via the mechanism of variable resistance. These devices sense temperature, light, pressure, humidity, conductivity, and force, for example. Such sensors measure the physical parameter of interest by reading out the inherent parameter-sensitive resistance or conductance Design by Steve Woodward, University of North Carolina, Chapel Hill, NC
Optocoupler extends high-side Current-sensorto 1 kV - 03/01/01 EDN Design Ideas: The task of sensing dc current at high voltage is often problematic. Most high-side current-sensing ICs available off the shelf are good only to 30 or 40V. Combining an optocoupler with such an IC yields a sensing circuit in which the only limitation of the high-side voltage is the optocoupler's standoff voltage (Figure 1). Design by Roger Griswold
Optocoupler simplifies power-line Monitoring - 10-Jan-02 EDN Design Ideas: The use of a linear optocoupler and a capacitor-based power supply yields a simple, yet precise power-line-monitoring system. The circuit in Figure 1 converts the 110V-ac power-line voltage to an ac output voltage centered at 2.5V, covering 0 to 5V. The circuit isolates the output signal from the power line Design by Alfredo del Rio and Ana Cao y Paz, University of Vigo, Spain
Oscillator/Reference Oven Temperature Regulation - 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
Oscillators Convert Temperature to Time - 03/30/95 EDN Design Ideas: Fig 1's simple arrangement of active-R oscillators accurately converts temperature into time. Most designers use these types of oscillators for low-grade oscillators that don't have stringent waveshape and frequency-stability requirements. However, the three-phase symmetrical active-R oscillator actually can generate an excellent triangular waveform. in this case, the oscillators become relaxation generators in which the input stage's constant bias current periodically charges and discharges the op amp's compensation capacitor. Design by Dan Stiurca, Gh Asachi Technical University, Iasi, Romania
Oscilloscope Testing Module - (Huntron circuit) that shows Lissajous patterns__ Pericom Semiconductor
Oscilloscope Trigger / Triggering Tutorial -
Triggers are the method by which an oscilloscope synchronises the voltage and
time data of your waveform, enabling you to view your signal fixed to a
voltage/time point to analyse it further. Essentially your preset trigger
methods are programmed into your scope, you just have to set a condition
(sometimes multiple conditions) that your oscilloscope will look out for. When
your waveform satisfies that condition, your scope will begin sampling and
displaying it central to your screen. Many methods of triggering are available
with modern DSOs, the most basic of these is edge triggering.
Overcurrent & Undervoltage Battery Fault Protection - The LT6109 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and two comparators. Two versions of the LT6109 are available. The LT6109-1 has the comparators connected in opposing polarity and the LT6109-2 has the comparators connected in the same __ Linear Technology/Analog Devices App Note, Sep 7th 2011
Overcurrent Battery Fault Protection - The LT6108 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and a comparator. Two versions of the LT6108 are available. The LT6108-1 has a latching comparator and the LT6108-2 has a non-latching comparator. in addition, the current sense amplifier __ Linear Technology/Analog Devices App Note, Sep 7th 2011
Overflow Water-Tank Indicator - Water is a vital but scarce natural resource. To prevent water wastage, this water-tank overflow indicator comes in handy. it gives audio as well visual alarm whenever the water tank overflows.Fig....__ Electronics Projects for You
Over-Heating Indicator for Water Pipe - The hot water pipe from the water geyser of your bathroom may burst if it gets overheated and is left unattended. This circuit monitors the temperature of the water pipe. if...__ Electronics Projects for You
Overload & Reverse Currentry Protects Battery & Load - 03/01/96 EDN Design Ideas: Battery-operated equipment is prone to the consequences of backward-installed batteries, accidental short circuits, and other careless use. The effects of a reversed battery are critical. Unfortunately, it's difficult to guard against a reversed battery. To make Design by Dana Davis, Maxim Integrated Products
Over-Temperature Alarm - This circuit can be used as a warning device which triggers an alarm whenever the temperature exceeds a preset level. it can also be used as a door-alert or general warning...__ Electronics Projects for You
Overvoltage Regulator with 250V Surge Protection - The LT4363 surge stopper protects loads from high voltage transients. it regulates the output during an overvoltage event, such as load dump in vehicles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value allowing the loads to continue functioning. The LT4363 also monitors the voltage__ Linear Technology/Analog Devices App Note, Jan 16th 2012
Overvoltage Regulator with Low Battery Detection & Output Keep Alive During Shutdown - The LT4356 surge stopper protects loads from high voltage transients. it regulates the output during an overvoltage event, such as load dump in automobiles, by controlling the gate of an external N-channel MOSFET. The output is limited to a safe value thereby allowing the loads to continue functioning. The LT4356 also monitors__ Linear Technology/Analog Devices App Note, Apr 26th 2010
Owens Bridge Inductance Measurement Device - The circuit is a very simple RCRCRC filtered supply and a current source. The filtered supply provides 174 bolts at no load, and drops to 106 volts at 400mA. Ripple must be relatively low. in this supply, ripple is about 2 mV at 400mA load, so it is sufficiently filtered. Available voltage ranges from 154 volts at__ Steve?
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