piclist 2004\07\01\150225a >
Thread: Driving ATtiny11 with 9v battery
www.piclist.com/techref/power/batterys.htm?key=battery
flavicon
face BY : David VanHorn email (remove spam text)



>
>The power loss in the zener is the zener voltage times whatever the
>circuit draws. If the circuit draws nothing, the zener wastes nothing.
>The only thing more efficient would be an actual power converter (ie
>switching regulator).

However, there is NO regulation at all.
Any voltage variation on the supply is passed direct to the micro.

For that matter, if efficiency and low cost are the issue, why are we talking about a 9V battery?  Four AA cells and a series diode would give better regulation than the 9V/Zener system, and reverse protection as well. An LDO would be better, but I could argue for this system in a product design, in some cases.

Caps are needed in all cases, I figured those as a "gimme".


>>
>> As far as getting a newbie into trouble, I assume that the kit comes
>>...
>
>Just make sure newbies understand that a zener is supposed to be
>pointing the "wrong" way ;-)

It's not the zener that I'm worried about, it's the main supply.

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics

<5.1.1.6.2.20040701135853.01a872b0@mail.cedar.net>

In reply to: <71075a390407011154202afa7e@mail.gmail.com>
See also: www.piclist.com/techref/power/batterys.htm?key=battery
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) Driving ATtiny11 with 9v battery

month overview.

new search...