Choice of regulator

[Captain Blammo]

I've got some batteries out of an old camcorder that are 6v and can give out
plenty of current, but the 7805's I'm using need 7v, and I don't want to
overvolt the stuff being powered at all, so I need a regulator of some sort.

How can I regualte 6v down to 5v? Are there any cheap/small regulators that
can do that? If so, please let me know! If there's one that can produce both
5v and 3.3-3.5v at the same time, that'd be even better. I'm not well versed
in components, and 7805's are all I've ever used.

Thanks for any recommendations!

CB

 

[Lord Garth]

"Captain Blammo" <eas6@nbnet.nb.ca> wrote in message
news:9C%3e.9682$Ln.444632@ursa-nb00s0.nbnet.nb.ca...

I've got some batteries out of an old camcorder that are 6v and can give
out
plenty of current, but the 7805's I'm using need 7v, and I don't want to
overvolt the stuff being powered at all, so I need a regulator of some
sort.

How can I regualte 6v down to 5v? Are there any cheap/small regulators
that
can do that? If so, please let me know! If there's one that can produce
both
5v and 3.3-3.5v at the same time, that'd be even better. I'm not well
versed
in components, and 7805's are all I've ever used.

Thanks for any recommendations!

CB

Try the 78L05...it needs less overhead. You might also look a number of
switching regulators on the Maxim-ic page as well as TI.

 

[News Me]

Captain Blammo wrote:

I've got some batteries out of an old camcorder that are 6v and can give out
plenty of current, but the 7805's I'm using need 7v, and I don't want to
overvolt the stuff being powered at all, so I need a regulator of some sort.

How can I regualte 6v down to 5v? Are there any cheap/small regulators that
can do that? If so, please let me know! If there's one that can produce both
5v and 3.3-3.5v at the same time, that'd be even better. I'm not well versed
in components, and 7805's are all I've ever used.

Look at LDO (low drop out) regulators such as the LM2940CT series.
These claim to have a maximum drop out voltage of 1.0V over the entire
temperature range and typical dropout of 0.5V at room temperature. They
are rated for 1.0A. There are other parts with 3.3A and 5A ratings, but
the dropout on those are greater than 1V.

NM

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