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Current Source / Sink Circuits

40 Volt Current Source operates From  40 to +85�C: 06/22/1995 EDN - Design Ideas / Wide Output Current range Sources that accommodate a wide Supply and Temperature range, based on LM317

60 MCurrent Source Feeds Telecomm Lines: 12/12/97 EDN-Design Ideas

BiPolars Provide StableCurrent Source: 09/24/98 EDN-Design Ideas

Circuit forms novel floating current source: 05/01/03  EDN-Design Ideas / Figure 1 shows a polarization circuit applicable to ISFET (ion-sensitive field-effect-transistor) sensors. ISFETs are solid-state chemical sensors that measure the pH value of a solution in biomedical and environmental applications, for example. The circuit in Figure 1 is extremely simple; it sets fixed-bias conditions for ISFET sensors (VDS=I0 RX; IDS=I0)....

CMOS Buffer Delivers Precise Current Pulses: 12/08/94 EDN-Design Ideas

Constant current Amplifier :

Constant Current Battery Charger:

Current Source has High Output Impedance: 06/22/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find the one of interest / Composite10-mA current-source configuration that has a compliance voltage of5 to42V, a set-current error of less than1% and an output impedance of greater than100 megaohms HAVE TO LOG IN TO RETRIEVE CIRCUIT

Design Formulas Simplify Classic V/I Converter: 01/20/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Digital current source is nonvolatile: 02/07/2002  EDN - Design Ideas / Digitally programmable current sources that feature automatic trimming and retain the setting despite power-down cycles are useful in applications such as RF- and laser-communications drivers. The circuit in Figure 1, for example, is particularly suited for setting the drive current for the optical pump in widely tunable VCSELs (vertical-cavity surface-emitting lasers). .

High Speed Regulator Makes great Current Source: 07/16/98 EDN Design Ideas -- Bandwidth of this circuit measures more than1 MHz, only the selected MOSFET and the ratings of the input supplys bypass capacitors limit the voltage compliance

Linear Constant Current LED Lamp Dimmer: This circuits drives24 white light LEDs with an adjustable constant current.

PC Controlled Current Source Supplies 100V, 1A, 16Bit Pulses : 04/29/02 Electronic Design - Ideas for Design / The current source shown in the figure is designed to support toroidal-cavity nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements of molecular electrical mobility in chemical samples. To do so,...  

Precision Current Sink Costs Less than $20: 03/13/98 EDN-Design Ideas / Simple active load circuit for current from1 mA to1A and voltage from3 to40-Volt

Reference stabilizes exponential current: 10/25/2001 EDN - Design Ideas / In an antilog converter, the difference between the base voltages of two transistors sets the ratio of their collector currents: The use of matched transistors balances the first-order temperature coefficient but leaves a temperature-dependent gain term, q/kT. Classic antilog circuits use a thermistor in the drive circuitry to correct this temperature dependency. .

Simple Current Source & Sink Circuits have Low TC: 07/04/96 EDN-Design Ideas

Simple High Efficiency Current Source Is Adjustable: 04/28/03 Electronic Design - Ideas for Design / IOccasionally, the need arises for a simple current source that can be easily adjusted over a relatively wide range of current levels. The circuit shown in the figure uses a 200-kHz pulse-width modulation... —

Simple Scheme keeps Current Drain Constant: 04/12/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit.

Step up / Step Down Current Source Charges Batteries: 07/16/98 EDN Design Ideas

Stepup/stepdown Current Source Charges Batteries: 06/05/96 EDN-Design Ideas

Voltage to current converter drives white LEDs: 06/27/2002  EDN - Design Ideas / You sometimes need to drive a white LED from one 1.5V battery. Unfortunately, the forward voltage of a white LED is 3 to 4V. So, you would need a dc/dc converter to drive the LED from one battery. Using the simple circuit in Figure 1, you can drive one white LED or two series-connected green LEDs, using only a few components..

Voltage To Current Converter Works From Single Supply Rail: 02/17/03 Electronic Design - Ideas for Design / Voltage-to-current converters feeding to grounded loads often find their way into industrial measurements and control applications. The conventional textbook circuit needs both positive and negative-supply rails

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