EDN

Circuit provides 4- to 20-mA loop for microcontrollers

The 4- to 20-mA current loop is ubiquitous in the world of controls in manufacturing plants. Discrete logic, microprocessors, and microcontrollers easily cover the digital portions of control schemes, ...
Hackaday

The 4-20 MA Current Loop

The I/O capabilities built into most microcontrollers make it easy to measure the analog world. Say you want to build a data logger for temperature. All you need to do is get some kind of sensor that ...
EDN

A 4- to 20-mA loop needs no external power source

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 ...
Machine Design

Sensor Sense: 4-to-20-mA Current Loops

Use of 4-to-20-mA current loops involves more than just a simple series connection between sensor, display, and power supply. The point where a sensor takes a measurement is, at times, many yards away ...
AOL

Signal Chain Solution for 4-mA to 20-mA HART Enabled Field Instrument Applications

NORWOOD, Mass.--(BUSINESS WIRE)-- Analog Devices, Inc. (NAS: ADI) introduced today the CN0267 demonstration circuit for a loop powered HART® (Highway Addressable Remote Transducer) enabled smart ...
Electronic Design

Design A Low-Cost 4- To 20-mA Receiver Circuit For Control Loops

Current-mode control loops (particularly the popular 4- to 20-mA controls) are used in many industrial applications because of their immunity to induced EMI from motors, contactors, relays, and other ...
Electronic Design

4-To-20-mA Loop Powers Temperature Sensor

Using an analog temperature sensor, an op amp, a transistor, and a low-dropout linear regulator, this circuit provides a 4-to-20-mA output over a 3.75- to 28-V compliance range (see the figure).