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Current Source / Current Sink Circuits   Page 2
Current Source / Current Sink:  #-C      D-R      S-Z

Last Updated on: Wednesday, June 02, 2021 04:34 AM


Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

DAC and flip-flops form constant-current-source -  23-Apr-09 Issue of EDN  Using two flip flops, you can program a serial-input DAC to produce a constant 4 mA..... [Design Idea by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia]
Derive a simple high-current-source from a lab supply -  16-Oct-08 Issue of EDN  With a few additional components, you can configure a laboratory power supply as a high-current source..... [Design Idea by Roger Griswold and Alfredo Saab, Maxim Integrated Products, Sunnyvale, CA]
 
Digital current-source is nonvolatile -  7-Feb-02 Issue of EDN  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..... [Design Idea by Stephen Woodward, University of North Carolina, Chapel Hill]
Error compensation improves bipolar-current sinks -  6-Jul-06 Issue of EDN  Circuit compensates for pass-transistor's base-current error..... [Design Idea by Christian de Godzinsky, Planmeca Oy, Helsinki, Finland; Edited by Brad Thompson and Fran Granville]
High Output Impedance Current Mirror -  Circuit Ideas for Designers Application Notes Advanced Linear Devices, Inc.....[App Note]
High-speed regulator makes great current source -  07/16/98 EDN-Design Ideas.....To power a load that requires a high-compliance current source (for example, a plasma tube, such as an ion laser), a circuit must provide very accurate current control with a wide bandwidth and a voltage compliance of several hundred volts. You can use a high-speed linear-regulator.....File has several circuits, please scroll to find this one..... [Design Idea by  Craig Varga, Linear Technology Corp, Milpitas, CA]
JFET cascode boosts current-source performance -  11-May-06 Issue of EDN  A constant-current source minimizes the reference circuit's sensitivity to supply-voltage fluctuations and extends the voltage reference's operating voltage beyond its 5.5V maximum rating..... [Design Idea by Clayton B Grantham, Tucson, AZ; Edited by Brad Thompson and Fran Granville]
Linear Constant Current LED Lamp Dimmer -  This circuits drives24 white light LEDs with an adjustable constant current. (added 4/02)
Low-Overhead Current Source -  This circuit has a very low overhead of just 120uA, and most of that is transistor base drive. The voltage reference only uses 20uA of current. Also, the circuit is designed to saturate if required, to maintain output current. The overhead current quickly goes up at that point.  This circuit is ideal for squeezing out the last bit of battery power for an LED circuit.  [Designed by Andrew R. Morris  (added 09/05)]
PC Controlled Voltage or Current Source -  Fair Waring, site contains annoying popups.  This project was begun as a means to charge and cycle NiCad batteries but has become a versatile tool for experiments requiring either a controlled voltage up to +30V and/or a current of +/2.5 Amps. (added 5/05)
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..... [Design Idea by Carlos Barberis, Bartek Technologies, Haverhill, MA]
Precision current-source is software programmable -  17-Dec-04 Issue of EDN  With the addition of a few inexpensive miniature components, the hard-wired, voltage-controlled current source of yesterday becomes a software-programmable voltage-controlled current source (Figure 1]. A digital potentiometer, IC1 in conjunction with a precision op amp, IC2, sets current through a pass transistor, ISET, and a shunt regulator, IC3, provides a constant reference voltage across..... [Design Idea by Joe Neubauer, Maxim Integrated Products Inc, Sunnyvale, CA]
Reference stabilizes exponential current -  25-Oct-01 Issue of EDN  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..... [Design Idea by Tom Napier, North Wales, PA]
 
Current Source / Current Sink:  #-C      D-R      S-Z

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