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4 20ma - Computers electronics


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Circuit: 4 � 20ma Current Loop Tester__ Circuit designed by David A. Johnson, P.E.

This circuit injects an adjustable current through a wire loop.  Using a digital current meter, the current can be adjusted from near zero to over 24 milliamps.

http://www.discovercircuits.com/DJ-Circuits/currentsource1.htm


Search result for: 4 20ma to usb :: High-Voltage-Lab.com

4 20ma to usb circuit diagrams. Search DIY electronic projects and circuit diagrams with descriptions. Learn electronics.

http://www.high-voltage-lab.com/search/4-20ma-to-usb


4 to 20mA current loop output circuit using DAC AD421

With 5V power, AD421 basic wiring as shown. The figure, AD421 voltage regulator with an external regulator DN25D depletion FET and other devices with the power supply to the AD421, UCC termination 2. 2µF decoupling capacitors to ensure stable output voltage adjust and to absorb the AD421 and other spikes generated by the device. When the AD421 selection 3V operating voltage, in the COM, LOOPRTN side should be connected between the resistor 16kO to adjust the gain of AD421........

http://8085projects.info/4-to-20ma-current-loop-output-circuit-using-dac-ad421.html


Circuit - TEMPERATURE SENSOR WITH 4 To 20mA CURRENT LOOP - Circuits designed by David A. Johnson, P.E.

I designed a circuit similar to this one years ago to accurately measure the air temperature inside a building 1000s of feet from a control room. The circuit uses a very robust current loop method.It uses a highly accurate semiconductor temperature sensor and an equally accurate voltage reference. The circuit includes a diode bridge, so it is polarity independent. By using the component values indicated, the circuit should not require calibration. It has a range from –40F to +120F and an accurac.......

http://discovercircuits.com/DJ-Circuits/tempsen1.htm


pdf8b30_31

High Performance Signal Conditioners DSCA DSCA42 2-Wire Transmitter Interface Signal Conditioners with Loop Power Description Each DSCA42 2-wire transmitter interface module provides a single channel of 4 to 20mA process [. . ]

http://www.dataforth.com/catalog/pdf/8b30_31.pdf


pdfCURRENTSOURCE1

4 + CURRENT OUT + IN E C 2 CURRENT METER +24V + C12V OUT 3 GND GND 8 IN B 0 - 25ma OUT LMC6482TOP VIEW 0 - 24.5mAE B 1 CW10 TURN POT CURRENT ADJSMALL HEAT SINK 7812 - DRAWN BY: DAVE JOHNSON 4 - 20MA CURRENT LOOP TESTER DAVID JOHNSON AND ASSOCIATES

http://www.discovercircuits.com/PDF-FILES/CURRENTSOURCE1.pdf


Monterey (MAXREFDES15#): Ultra-Low Power, High-Accuracy 4-20mA 2-Wire Current-Loop Sensor - Subsystem Board - Maxim

Monterey features ultra-low power, 4 20mA current-loop transmitter, RTD PT1000 sensor, high precision, noise-free code resolution and high accuracy.

/en/app-notes/index.mvp/id/5683


pdfUltraLowCurrentLEDFlasher5

+3V +3V +3V +3V 3V 8 47 4 3 20mA PEAK 1.5M 6 2 1 0. 22uF 2Hz OSC AVERAGE CURRENT = 20mA APPROX. 70 HOURS OPERATION TOP VIEW 4. 7K B [. . ]

http://discovercircuits.com/DJ-Circuits/UltraLowCurrentLEDFlasher5.pdf


Search result for: 4 20ma :: High-Voltage-Lab.com

4 20ma circuit diagrams. Search DIY electronic projects and circuit diagrams with descriptions. Learn electronics.

http://www.high-voltage-lab.com/search/4-20ma


CARGADOR DE BATERIAS 12V

Tal como dijimos en un artículo que publicamos hace ya unos 8 años, si tuvo la tentación de cargar una batería de níquel-cadmio de 12V a partir de otra batería idéntica, habrá comprobado, sin duda alguna, que dicha misión es imposible de conseguir a pesar de que las tensiones nominales de los depósitos "sean idénticas" y que una de ellas esté completamente cargada. La razón es bien sencilla: contrariamente a lo que podía pensarse por el valor de su tensión nominal, fijada en 1, 2V, un elemento d.......

http://elrincondeloscircuitos.blogspot.com/2011/01/cargador-de-baterias-12v.html


High Efficiency, Small Form Factor 4-20mA Current Loop 2-wire Sensor Power Supply - PMP6938 - TI Tool Folder

The PMP6938 design uses the TPS54062 synchronous step-down DC/DC converter as an alternative to a linear regulator for 2 wire 4-20mA current loop applications. The design is optimized for small size and fits within 7mm x 15.5mm x 0. 8mm board area. The input voltage withstands line transients up to 60V and is configured to deliver 3. 3V/30mA at 400kHz. The output filter employs a 4. 7uF ceramic output capacitor and a 1mH inductor in a small 1812 package. The efficiency peaks at 70% at 20mA from .......

http://www.ti.com/tool/pmp6938


Precision Capacitive Touch/Proximity Sensor Circuit Part 1

The IC PCF8883 is designed to work like a precision capacitive touch and proximity sensor switch through a unique (EDISEN patented) digital technology for sensing the minutest difference in the capacitance around its specified sensing plate. The main features of this specialized capacitive touch and proximity sensor can be studies as given below: The following image shows the internal configu.......

http://www.homemade-circuits.com/2016/01/precision-capacitive-touchproximity.html


Dual Door Bell with LEDs ( Rev. A) - application note for PRG0801

Author: Chaonan Chen, Huihui Duan, Au Group ElectronicsThis document is one of the application notes for Au Group Electronics 8-pin integrated circuit chips: Dual Door Bell with LEDs (Part#: PRG0801P and PRG0801SN). Features? Dual independent switches input? Dual independent buzzer drivers? Dual independent LED drivers? Low power CMOS design? Wide power supply range from 3. 0 to 5.5 volts. Low power mode saves batteries? Dual independent push-pull type Buzzer/LED drivers? Random frequency and in.......

http://augroups.blogspot.com/2009/02/dual-door-bell-with-leds-rev.html


pdfLinear Technology Magazine Circuit Collection

Application Note 67 is a collection of circuits from the first five years of Linear Technology, targeting data conversion, interface and signal processing applications. This Application Note includes circuits such as fast video multiplexers for high speed video,

http://cds.linear.com/docs/en/application-note/an67f.pdf


pdfZTX558

PNP SILICON PLANAR MEDIUM POWER HIGH VOLTAGE TRANSISTOR ISSUE 1 APRIL 94 FEATURES * 400 Volt VCEO * 200mA continuous current * Ptot= 1 Watt ZTX558 C [. . ]

http://www.diodes.com/datasheets/ZTX558.pdf


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