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Design Formulas Simplify Classic V/I Converter: 01/20/00 EDN-Design Ideas /
(Electronic circuit added 7/03) |
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Digital Current Source is Nonvolatile: 02/07/02 EDN Design Ideas / (added
1/05) 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). ... |
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Dn25 Series: Constant Current Sources: Supertex Semiconductors (app note added 2/06) |
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Error compensation improves bipolar-current sinks: 7/6/2006 EDN Design Ideas / (added
02/07) Circuit compensates for pass-transistor's base-current error. |
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High Output Impedance Current Mirror: Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic
design added 6/06) |
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High Output Impedance Current Source: Circuit Ideas for Designers - Application Notes - Advanced Linear Devices, Inc. (Circuit / schematic
design added 6/06) |
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High-Speed Regulator Makes Great Current Source : 07/16/98 EDN-Design Ideas /
(added 2/06) |
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Linear Constant Current LED Lamp Dimmer: This circuits drives24 white light LEDs with
an adjustable constant current. (Electronic Schematic / circuit added 4/02) |
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Lnd1 Series: Constant Current Sources: Supertex Semiconductors (app note added 2/06) |
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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) |
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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) |
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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.
(Circuit / schematic design added 6/06) |
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Photo-Diode Current-To-Voltage Converters: National Semiconductor - Application Note (added 2/06) |
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Precision Current Sink Costs Less Than $20: 03/13/98 EDN-Design Ideas / (added 03/03)
-- Simple active load circuit for current from1 mA to1A and voltage from3 to40-Volt |
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Precision Current Source is Software Programmable: 12/17/04 EDN Design Ideas /
(added 1/05) 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 ...... |
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Reference Stabilizes Exponential Current: 10/25/01 EDN Design Ideas /
(added 1/05) 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.
... |
