• NMH/NiCd 6v 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 . . . [Hobby Circuit designed by David A. Johnson P.E.,  12/12/04]

• One 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 . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/11/06]

PC Controlled Voltage or Current Source -  If you are interested in model aeroplanes and have the capital, a radio controlled electric park flyer is a must have. An RC aeroplane under 400 grams floats around like the rubber models of my youth and contact with the ground doesn't seems to involve that sickening crunch. . .  [Electronic communications to r dot p at webone.com.au]

Peaking Current Source Has High Rejection -  02/15/96  EDN Design Idea   A cascade peaking current source significantly improves the output-current regulation compared to conventional and Widlar current sources but imposes only a minor increase in circuit complexity. Peaking current sources are those with a characteristic ope. . .  [by Michael Wyatt, Honeywell Inc]

Precision Current Sink Costs Less Than $20 -  03/13/98 EDN Design Idea   (File has several circuits, scroll to this one) Simple active load circuit for current from1 mA to1A and voltage from3 to40-Volt. . .  [by Carlos Barberis, Bartek Technologies, Haverhill, MA]

Precision current-source is software programmable -  12/17/04  EDN Design Idea   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. . .  [by Joe Neubauer, Maxim Integrated Products Inc, Sunnyvale, CA]

Provide Constant Current for ISFETs/MEMFETs -  10/26/00  EDN Design Idea   ISFETs and MEMFETs (ion-sensitive and membrane FETs] are solid-state chemical sensors that provide an electrical signal associated with the change of a. [Pdf contains several circuits, scroll to find this one. . . .  [by Casans, D Ramirez, and AE Navarro, University of Valencia, Burjassot, Spain]

Provides Constant Current for ISFETs/MEMFETs -  10/26/00  EDN Design Idea   ISFETs and MEMFETs (ion-sensitive and membrane FETs] are solid-state chemical sensors that provide an electrical signal associated with the change of a. [Pdf contains several circuits, scroll to find this one. . . .  [by Casans, D Ramirez, and AE Navarro, University of Valencia, Burjassot, Spain]

Reference stabilizes exponential current -  10/25/01  EDN Design Idea   In an antilog converter, the difference between the base voltages of two transistors sets the ratio of their collector currentsThe use of matched transistors balances the first-order temperature coefficient but leaves a temperatu. . .  [by Tom Napier, North Wales, PA]

Regulator Can Source and Sink Current -  12/07/95  EDN Design Idea   Although a positive supply regulator usually acts solely as a current source, some applications require both sourcing and sinking. For these applications, Linear Technology’s LT1118 family of low-dropout regulators can source and sink as much as 800 and 4. . .  [by Bill Schweber Linear Technology Corp, Milpitas, CA.]

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