Current Source / Current Sink Circuits
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Current Source / Current Sink: #-C
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Last Updated on:
Monday, October 03, 2011 06:07 PM |
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Links to electronic circuits, electronic schematics, designs for engineers,
hobbyists, students & inventors:
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Scheme Keeps Current Drain Constant - 04/12/01 EDN-Design
Ideas EDN is migrating links. This link is not verified.
Google the "title" EDN for new link. |
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Simple Current-Sense Technique Eliminating a Sense Resistor AN-7 -
Application Note 7 from Microsem.....[App Note] |
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Simple Current-source & Sink Circuits Have Low Tc - 07/04/96
EDN-Design Ideas.....Most current-source and -sink circuits are either
simple, precise, or low dropout. The circuits in Figure 1 have the
advantage of all three features and are also switchable. Figure 1a was
originally intended for the current-source side of an H-bridge drive
for spacecraft torque rods. Thus, high-reliability and
radiation-tolerant components are not necessary..... [Design Idea by
Carl R Anderson, Ball Aerospace, Boulder, CO] |
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Simple LED Constant Current Source - Chip manufacturers are
always coming up with ever more sophisticated constant current driver
chips for LEDs. We have included this design for those of you who
prefer a more cheap and cheerful solution.….must register on this
site.... [Published in Elecktor July/August 2010] |
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Simple Scheme keeps Current Drain Constant - 04/12/01 EDN-Design
Ideas.....It is sometimes advantageous to keep the overall current consumption of
an electronic device constant. A large, seven-segment display, for example,
draws nearly zero current when no segment is on to hundreds of milliamps when
fully lit.….PDF contains multiple circuits, scroll to find this circuit.....
[Design Idea by Peter Güttler, APS Software Engineering GmbH, Cologne, Germany] |
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Simple Variable Voltage Source - The high current regulator below uses
an additional winding or a separate transformer to supply power for the LM317
regulator so that the pass transistors can operate closer to saturation and
improve efficiency. For good efficiency the voltage at the collectors of the two
parallel 2N3055 pass transistors.....(added 4/05) |
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Step Up/Step Down Converter Takes 2 to 16V Inputs - 07/16/98 EDN-Design
Ideas.....The circuit in Figure 1 is a low-cost step-up/step-down dc/dc
converter. By definition, its input can range above and below the regulated
voltage. The circuit includes a simple switchmode boost converter (IC1] that
contains a comparator normally used to detect low battery voltagenThis file
contains several circuits, scoll to find this one..... [Design Idea by Lucian
Brodogna and Luca Vasalli. Maximin Integrated Products, Milan Italy] |
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Step up/step-down current-source charges batteries - 6-Jun-96 Issue of
EDN For battery charging, the highly efficient step-down (buck]
configuration is usually the topology of choice. However, a different approach is
necessary if the following conditions prevail The supply voltage is less
than the battery voltage, or, even worse, the supply voltage ranges above and
below the battery voltage..... [Design Idea by Michael Keagy, Maxim Integrated
Products, Sunnyvale, CA] |
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Switching regulator forms constant-current-source - 30-May-02 Issue of
EDN Many applications require current sources rather than voltage sources.
When you need a high-current source, using a linear regulator is inadvisable,
because of the high power dissipation in the series resistor. To solve the
wasted-power problem, you can use a switch-mode regulator. The circuit of Figure 1
uses IC1, an LM2576 adjustable regulator..... [Design Idea by Stefan Strozecki,
Institute of Telecommunications, Bydgoszcz, Poland] |
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TSM108 Evaluatin Board 12V to 6V DC/DC Converter - The TSM108 is a step
down controller that features constant voltage and constant current regulation.The
Evaluation Board was designed to allow different converter configurations. Several
options for power semiconductor footprints are available on the PCB in order to
make it adaptable to a wide range of converter output power. In a first step,(app
note added 3/05) |
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Variable Voltage Source - The high current regulator below uses an
additional winding or a separate transformer to supply power for the LM317
regulator so that the pass transistors can operate closer to saturation and
improve efficiency. For good efficiency the voltage at the collectors of the two
parallel 2N3055 pass transistors should be close to the output voltage.....(added
4/05) |
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Voltage-to-current converter makes a flexible current reference -
18-Sep-03 Issue of EDN The voltage-to-current converter in Figure 1 can both
source and sink current. The circuit isflexible than some traditional current
references that require different topologies for current sourcing and sinking.
Also, you can easily adjust the value of the current reference by simply adjusting
the circuit's input voltage..... [Design Idea by Art Kay, Texas Instruments,
Tucson, AZ] |
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Wide-Range Current-To-Frequency Converters - National Semiconductor
Application Note (app note added 2/06) |
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Zener oscillators - These two circuits are interesting from an academic
point of view. Their practical implementation is rather critical and it is not
easy to get steady operation. Circuit (a) requires a "cooked" zener: connect it
first to a constant current generator, then increase the current.....(added 9/07)
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Current Source / Current Sink: #-C
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