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A 4- to 20-mA loop needs no external power source - 09/13/01 EDN-Design
Ideas....The simple circuit in Figure 1 uses a low-current-drain MAX4073H
amplifier to sense the current flowing through a 4- to 20-mA loop. The
circuit senses the current through a 1Ω resistor with a fixed gain of 100
and uses no battery or dc power supply.... [Design Idea by Shyam Tiwari,
Sensors Private Ltd, Gwalior, India] |
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AC Current Indicator Light - This circuit could be wired into a
120vac power line, which feeds power to any load, ranging from 40 watts to
250 watts. It will turn on a LED light whenever current is being drawn
by a load. It is especially useful for remote lights, where you may
not be able to see if the lamps are receiving power. …. [Hobby Corner
Circuit by Dave Johnson] |
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AC Line Current Detector - This circuit will detect AC line
currents of about 250 mA or more without making any electrical connections
to the line. Current is detected by passing one of the AC lines through an
inductive pickup (L1) made with a 1 inch diameter U-bolt wound with 800
turns of #30, #35 magnet wire. The pickup could be made from other iron type
rings or.... [Bill Bowden] |
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Active-feedback IC serves as current-sensing instrumentation amplifier -
24-Jul-03 Issue of EDN High-speed current sensing presents a designer with some
significant challenges. Most techniques for sensing current involve measuring the
differential voltage the current produces as it flows through a sense element, such as
a resistor or a Hall-effect device. The differential voltage across the sense element
is generally small and is often riding on a common-mode voltage that is
considerably.... [Design Idea by Jonathan Pearson, Analog Devices, Wilmington, MA] |
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AN-244: A User's Guide to I.C. Instrumentation Amplifiers - AN-244 Analog
Devices Application Notes (app note added 2/06) |
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AN-245: Instrumentation Amplifiers Solve Unusual Design Problems - AN-245
Analog Devices Application Notes (app note added 2/06) Traditionally Considered
Only for Transducer-Conditioning Applications, Instrumentation Amplifiers Bring Unique
Performance Benefits to a Range of Or Applications as Well. |
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AN-282: Fundamentals of Sampled Data Systems - AN-282 Analog Devices
Application Notes (app note added 2/06) |
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AN-345: Grounding for Low-and-High-Frequency Circuits - AN-345 Analog
Devices Application Notes (app note added 2/06) Know Your Ground and Signal
Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just
Resistance.... |
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AN35 High-Side Current Sensing: Considerations & Applications for High-Side Current
Monitoring - Zetec Semiconductors Applications Notes A guide for
using ZXCT range of products. Contained within note are application ideas
for extended supply ranges, a circuit for bi-directional current sensing and an
over-current/short circuit protection circuit. Now updated and contained within AN39
(app note added 2/06) |
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AN39 Current Measurement Applications Handbook - Zetec Semiconductors
Applications NotesThis applications handbook explores how requirements affect
design for AC and DC current measurement and implications on cost and
performance for different approaches. (app note added 2/06) |
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AN-539: Errors & Error Budget Analysis in Instrumentation Amplifier Applications -
AN-539 Analog Devices Application Notes (app note added 2/06) Describes a
systematic approach to calculating overall error in an instrumentation amplifier
application. |
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AN-589: Ways to Optimize the Performance of a Difference Amplifier - AN-589
Analog Devices Application Notes (app note added 2/06)This Application Note
presents several ways to build and optimize performance of a discrete difference
amplifier. It also recommends amplifiers that will make overall solution
cost/performance competitive with monolithic instrument amplifiers. |
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AN-597: Current Feedback Amplifiers - National Semiconductor Application
Note (app note added 2/06) |
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AN-671: Reducing RFI Rectification Errors in In-Amp Circuits - AN-671 Analog
Devices Application Notes (app note added 2/06) |
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AN-683: Strain Gage Measurement using an AC Excitation - AN-683 Analog
Devices Application Notes (app note added 2/06) |
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AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -
AN-772 Analog Devices Application Notes (app note added 2/06) |
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AN-840: Development of an Extensive SPICE Macromodel for 'Current-Feedback' Amplifiers
- National Semiconductor Application Note....[App Note] |
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Analog-input circuit serves any microcontroller - 20-Dec-01 Issue of EDN
The simple ADC in Figure 1 is perfect for getting analog signals into a purely digital
microcontroller. Using just five surface-mount parts, you can assemble it for less
than 50 cents (1000], which is approximately half the cost of a single-chip-ADC
approach in the same volume. Moreover, this design takes only one pin from the
microcontroller to operate.... [Design Idea by Steven Hageman, Agilent Technologies,
Santa Rosa, CA] |
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Bias Voltage & Current Sense Circuits for Avalanche Photodiodes - AN92
Linear Technology Avalanche photodiodes, used in laser based fiberoptic systems,
require high voltage bias and accurate, wide range current monitoring. Bias voltage
varies from 15V-90V and current ranges from 100nA to 1mA, a 10,000:1 dynamic range.
This publication presents various 5 volt powered circuits which meet se requirements.
Appended sections detail specific circuit techniques and cover measurement practice.
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