Video Design Idea: Build your own laboratory precision voltage reference
Designers working on analog circuits in the lab often need accurate voltage sources to test the operation of op amps and other components. A lab power supply isn't a very good choice for such work because most such supplies aren't stable over temperature and time. Of course you could use a 7-decade Kelvin-Varley precision voltage reference although such instruments are relatively expensive and perhaps overkill for the task at hand. Or you can build your own relatively inexpensive 5-decade reference and power it with batteries to ensure that no line noise corrupts the precise output.
Check out these related EDN links:
Precision voltage reference delivers 80 mA (12/1/2006)
Anatomy of a precision-voltage reference (6/24/2004)
Voltage reference is software-programmable (8/18/2005)
Low-voltage reference uses the ΔVBE circuit (10/28/2004)
Here is the Dekapot precision resistor used in this design.
For comments, questions, or suggestions relative to EDN Video Design Ideas, contact Maury Wright, 858-748-6785, firstname.lastname@example.org