At Geller Labs, we use LM399s in our high performance, low cost voltage standards for hobbyists, schools, and amateur scientists as the 01HS high stability option. Even with its special thermally insulating cover, all of our products using the LM399 are contained within an enclosure — such as a plastic box — to further shield the LM399 from room air currents.
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Electronic Gadgets 2006-02 (PCB layout images)