piclist 2004\07\02\085055a >
Thread: Driving ATtiny11 with 9v battery
face BY : David VanHorn email (remove spam text)

>To guarantee that datasheet spec is met for the L part (and guaranteeing
>that datasheet spec is met is an essential part of acceptable design), you
>could allow the battery to go from 9v6 down to 6v8 IF the zener knee was
>100% square.

Zeners have bad knees.
Worse, as the current goes down, the knee gets worse, and the Vz changes.

> While it MAY be OK to run a blink-a-LED program with such a
>widely varying supply, the savings of a few cents in the power supply is
>exposing beginners to a range of other factors which may confuse and


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In reply to: <035a01c46006$c60c4660$7c01a8c0@y2k>
See also: www.piclist.com/techref/power/batterys.htm?key=battery
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Subject (change) Driving ATtiny11 with 9v battery

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