2-Terminal Temperature-to-Current Thermometer Suitable for Use at the End of Long Wire Runs - By adding the LT3092 to a thermistor kit along with three 0.1% accuracy resistors and one final trim, a very accurate 2-terminal temperature-to-current converter can be built. This circuit measures 700μA operating current at 0°C, dropping by 2μA every degree until 100°C, at which point the current measures 500μA. The obvious __ Linear Technology/Analog Devices App Note, Oct 26th 2010
3-transistor current source covers wide range - 05/31/14 EDN-Design Ideas This Design Idea is a two-wire current regulator that strikes a good balance between performance and parts count. Employing three transistors, three resistors, and one LED, it achieves good regulation (better than 1% over most of the voltage range), lower operating voltage (1.2V typical), and better tempco (0.07%/K) than other circuits of similar complexity. It is designed to operate in a range of currents from tens of milliamperes to several amps. It does not use any hard to find parts; for example: an LM10 can be used to make an even higher performance circuit, but this IC is not multi-sourced and is likely to be discontinued. __ Circuit Design by Einar Abell0
40 Volt Current-source Operates from 40 to +85°C - 06/22/95 EDN-Design Ideas Wide-output-current-range sources that accommodate a wide supply and temperature range require special consideration. basic circuit of (Fig 1]provIdeas IOUT = VREF/RS; typically, VREF is 1.25V for__ Circuit Design by Ray Scott, SOR Inc, Lenexa, KS
60-mA Current Source Feeds Telecomm Lines - 12/18/97 EDN-Design Ideas An isolated 60-mA current source provIdeas 120V of compliance for use in telecommunication interfaces (Figure 1). Constant-current line feed provIdeas dc power for downstream circuitry independent of line length and provIdeas inherent short-circuit protection. The key to isolated__ Circuit Design by Kurk Mathews, Linear Technology Corp, Milpitas, CA
6v NMH/NiCd Battery Tester - I designed this circuit to test rechargeable six volt battery packs under constant current conditions. As designed, the circuit applies a 10 amp load to the battery pack. A heat sink must be used on the main power transistor. . . Circuit by Dave Johnson P.E.-December, 2004
A Compendium of Pleasant Current Events - Linear Technology AN90 __ Designed by Jim WilliamsApr 1st, 2002
Achieve Constant Current Over Wide Range of Terminal Voltages - 11/04/10 EDN-Design Ideas Eliminate errors caused by bias currents and temperature drifts. __ Circuit Design by Donald Boughton, Jr, International Rectifier, Orlando, FL
Adjustable Two Terminal 200mA Current Source - The LT3092 requires only two resistors to set the current between 0.5mA and 200mA __ Linear Technology/Analog Devices App Note, Mar 24th 2010
Amplifier & Current Source Emulate Instrumentation Amplifier - 11/13/03 EDN-Design Ideas The classic three- or two-op-amp instrumentation-amplifier circuits are standard ways to amplify a small-amplitude differential signal contaminated with high common-mode noise. In some applications, the signal source is floating wi__ Circuit Design by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria
AN90Current Sources for Fiber Optic Lasers: A Compendium of Pleasant Current Events - Linear Technology AN90 __ Designed by Jim WilliamsApr 1st, 2002
AN92Bias Voltage and Current Sense Circuits for Avalanche Photodiodes - Linear Technology AN92 __ Designed by Jim WilliamsNov 1st, 2002
Basic Current Source - Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc
Bias Voltage and Current Sense Circuits for Avalanche Photodiodes - Linear Technology AN92 __ Designed by Jim WilliamsNov 1st, 2002
Bidirectional Current Source - The LT1990 is a differential amplifier with integrated precision resistors. The circuit shown is the classic Howland current source, implemented by simply adding a sense resistor. __ Linear Technology/Analog Devices App Note, Mar 31, 2010
Bipolar current source maintains high output impedance at high frequencies - 12/05/05 EDN-Design Ideas Use line-receiver/amp ICs to build high-frequency constant-current sources__ Circuit Design by Alex Birkett, University College London, Hospital National Health Service, London, UK
Bipolars provide safe latch-off against opto failures - 12/07/00 EDN-Design Ideas A typical SMPS (switch-mode power supply]uses a reference voltage and an optocoupler to regulate the output voltage. The optocoupler carries the isolated information from the secondary side to the primary nonisolated side and ensures proper output regulation. Current-modePDF contains multiple circuits, scroll to find this circuit. __ Circuit Design by Christophe Basso, ON Semiconductor, Toulouse Cedex, France
Bipolars provide stable current source - 09/24/98 EDN-Design Ideas NOTE
: multiple circuits, scoll to this one. It's possible to implement a precise current source with a useful output at high frequencies, without using operational amplifiers. The circuit in Figure 1a suffers inaccuracies from both the VBE drop and the finite base current of the transistor. The circuit in Figure 1b overcomes the base-current problem, but has two VBE drops and does not perform well at high frequencies. __ Circuit Design by Bill Morong, Morong's Harness, Dover-Foxcroft, ME
Buffered Current Source - Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc
Build a precise DC floating-current source - 08/18/05 EDN-Design Ideas Use a general impedance converter and resistors to develop a specialized current source__ Circuit Design by D Ramírez,
Casans, C Reig, AE Navarro, and J Sánchez, University of Valencia, Burjassot, Spain
|