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Current Monitors / Sensors/ Detectors Circuits,
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Sensors / Detectors --
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Current Monitors / Sensors/ Detectors: #-B
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Last Updated on:
Friday, October 16, 2009 03:42 AM |
| Circuits
Designed by Dave Johnson, P.E. : |
- AC Current
Monitor
The hobby circuit below shows how a small current transformer from Magnetek can be
used to monitor AC current to a load. The AC voltage developed at the
secondary of the transformer can be scaled so it can be read by any digital
multimeter. The transformer is rated at 30 amps.
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- Bad Light
Bulb Indicator
This request came from a Discover Circuits visitor. He wanted to turn on a LED
indicator light whenever a circuit detected a burned out tail/brake light on a car
or truck. The circuit shown below uses a transistor switch, to detect current
flowing through a low value resistor. If current is flowing to a light bulb,
the circuit shunts current around a LED light, keeping the LED turned off. If there
is no current detected, the LED turns on. The circuit should operate from 6v
to 24v....
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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4 to 20 mloop needs no external power source - 09/13/01 EDN-Design Ideas:
The simple circuit in Figure 1 uses a low-current-drain MAX407).....(design idea added
11/05) |
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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. ….(designed by David A. 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...(electronic schematic / circuit added 4/02) |
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Active feedback IC Serves as current sensing instrumentation Amplifier - 07/24/03
EDN-Design Ideas: High-speed current sensing presents a designer with some
significant challenges. Most techniques for sensing current involve measuring
differential voltage current produces as it flows through.....(design idea added
12/04) |
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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 Notes This 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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Current Monitors /
Sensors/ Detectors: #-B
C D-Q
R-Z
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