Programmable current source requires no power supply
by John Guy, National Semiconductor, Santa Clara, CA; Edited by Charles H Small and Fran Granville, EDN, Jun 12 2008
Focus:
An inexpensive, programmable current source can be built from an adjustable linear regulator, a few BCD switches, and some resistors.
What you’ll learn:
- How to build an inexpensive programmable current source
- How to preload power supplies using an inexpensive, programmable current source
- How to charge and discharge batteries using an inexpensive, programmable current source
Notes:
Despite the title, this current source requires a 5-V power supply.
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