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Current Source / Current Sink Circuits   Page 1
Current Source / Current Sink:  #-C      D-R      S-Z

Last Updated on: Thursday, April 07, 2016 01:01 PM

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Circuits Designed by Dave Johnson, P.E. :
  • 1 Amp Current Injector -  I designed and built this thing many years ago. I published the hobby circuit in the now defunct “Radio Elecronics” magazine back in 1992. The electronic circuit injects a precise 1 Amp of current into any unknown resistor, up to about two ohms. Two alkaline C cells power the complete circuit.  . . . [Circuit by Dave Johnson P.E.,  07/11/06]

  •  100ma Current Source -  Often in industrial control systems a constant current source is needed, which is controlled by a computer and referenced to circuit ground. The circuit below converts a zero to 5v signal from a computer’s analog output into a current, with a full scale of 100ma. The circuit shown requires a 9v DC supply . . . [Circuit by David Johnson P.E.,  07/09/08]

  • 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.,  12/12/04]

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

±5A, 2.5V (2-Quadrant) μModule Voltage Regulator -  The LTM8052 is a 36VIN, 5A, 2-quadrant constant-voltage, constant-current (CVCC) step-down μModule® regulator. Included in the package are the switching controller, power switches, inductor and support components. Operating over an input voltage range of 6V to 36V, the LTM8052 supports an output voltage range of 1. 2V to 24V. . . .  [Linear Technology App Note - , Mar 30th 2012]

 

0A to 2A Current Source -  The LT1995 Amplifies the sense resistor drop by 5V/V and subtracts that from VIN, providing an error signal to an LT1880 integrator. The integrated error drives the PMOSFET as required to deliver the commanded current. . . .  [Linear Technology App Note - , ]

1 Amp Current Injector -  I designed and built this thing many years ago. I published the hobby circuit in the now defunct “Radio Elecronics” magazine back in 1992. The electronic circuit injects a precise 1 Amp of current into any unknown resistor, up to about two ohms. Two alkaline C cells power the complete circuit.  . . . [Circuit by Dave Johnson P.E.,  07/11/06]

100ma Current Source -  Often in industrial control systems a constant current source is needed, which is controlled by a computer and referenced to circuit ground. The circuit below converts a zero to 5v signal from a computer’s analog output into a current, with a full scale of 100ma. The circuit shown requires a 9v DC supply . . . [Circuit by David Johnson P.E.,  07/09/08]

 

1-Hz to 100-MHz VFC features 160-dB dynamic range -  09/01/05  EDN Design Idea   Transform voltage to current over wide frequency, Amplitude. The VFC (voltage-to-frequency-converter) circuit in Figure 1 achieves a wider dynamic range and a higher full-scale output frequency—100 MHz with 10% overrange to 110 MHz—by a factor of 10 over any commercially available converter. The circuit's 160-dB dynamic range spans eight decades for a 0 to 5V input range and allows continuous operation down to 1 Hz. Additional specifications include 0. 1% linearity, a 250-ppm/°C gain/temperature coefficient, a 1-Hz/°C zero-point shift, and a 0. 1% frequency shift for a 10% power-supply- voltage variation. A single 5V supply powers the circuit. . . .  [by Jim Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.]

 

2-Terminal 3A Current Source -  The LT3083 is a 3A low dropout linear regulator that can be paralleled to increase output current or spread heat on surface mounted boards. Architected as a precision current source and voltage follower, this new regulator finds use in many applications requiring high current, adjustability to zero, and no heat sink. The device . . .  [Linear Technology App Note - , Mar 9th 2011]

 

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 App Note - , Oct 26th 2010]

 

3-transistor current source covers wide range -  05/31/14  EDN Design Idea   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. . . .  [by Einar Abell0]

 

40 Volt Current-source Operates from  40 to +85°C -  06/22/95 EDN Design Idea   Wide-output-current-range sources that accommodate a wide supply and temperature range require special consideration. basic circuit of ( Fig 1]provides IOUT = VREF/RS; typically, VREF is 1. 25V for. . .  [by Ray Scott, SOR Inc, Lenexa, KS]

 

60-Ma Current Source Feeds Telecomm Lines -  12/18/97 EDN Design Idea   An isolated 60-mA current source provides 120V of compliance for use in telecommunication interfaces (Figure 1). Constant-current line feed provides dc power for downstream circuitry independent of line length and provides inhere. . .  [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.,  12/12/04]

 

A Simple Current-Sense Technique Eliminating a Sense ResistorAN-7 -  Application Note 7. . .  [Microsemi Corp]

 

Achieve Constant Current Over Wide Range of Terminal Voltages -  11/04/10 EDN Design Idea   Eliminate errors caused by bias currents and temperature drifts. . . .  [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 App Note - , Mar 24th 2010]

 

Amplifier and Current Source Emulate Instrumentation Amplifier -  11/13/03  EDN Design Idea   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. . .  [by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria]

 

AN-1244: Photo-Diode Current-To-Voltage Converters -  Application Note. . .  [National Semiconductor]

 

AN-240: Wide-Range Current-To-Frequency Converters -  Application Note. . .  [National Semiconductor]

 

AN-D16: Lnd1 Series: Constant Current Sources And -  Supertex Semiconductors. . . 

 

AN-D18: Dn25 Series: Constant Current Sources And -  Supertex Semiconductors. . . 

 

Basic Current Source  -  Circuit Ideas for Designers App Note - . . .  [Advanced Linear Devices, Inc]

 

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 App Note - , Mar 31, 2010]

 

Bipolar current source maintains high output impedance at high frequencies -  12/05/05  EDN Design Idea   Use line-receiver/amp ICs to build high-frequency constant-current sources. . .  [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 Idea   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 ensu. . .  [by Christophe Basso, ON Semiconductor, Toulouse Cedex, France]

 

Bipolars provide stable current source -  09-24-98 EDN Design Idea   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 problemFile contains several circuits, scroll to this one. . .  [by Bill Morong, Morong's Harness, Dover-Foxcroft, ME]

 

Bipolars Provide Stable Current-source -  09-24-98 EDN Design Idea   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 VBEdrop and the finite base current of. . .  [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 Idea   Use a general impedance converter and resistors to develop a specialized current source. . .  [by D Ramírez, S Casans, C Reig, AE Navarro, and J Sánchez, University of Valencia, Burjassot, Spain]

 

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