Need a regulator or step-down circuit that steps a battery d

[IdeaMan]

I want to step down a 7.2v lithium ion (Li-ion) camcorder battery to 4.7v to power my digital camera for long periods of
time, can someone send me schematic via email or post one that fits my needs. Thank you for help with this. I forgot the
email address: please send to blowphish@juno.com of hypnotech@juno.com .

 

[atec]

expected current draw ?.

IdeaMan wrote:

I want to step down a 7.2v lithium ion (Li-ion) camcorder battery to 4.7v to power my digital camera for long periods of
time, can someone send me schematic via email or post one that fits my needs. Thank you for help with this. I forgot the
email address: please send to blowphish@juno.com of hypnotech@juno.com .

 

[Bob Parker]

The MC34063 switching regulator chip would probably do what you want.
You can get the data sheet from http://wwww.ges.cz/sheet/m/mc34063.pdf
There's an example circuit for a step-down regulator giving a 5V
output for a 15-25V input. You'd probably need to recalculate the size
of the inductor for your 7.2V supply. Hope this is of some assistance.

Good luck,
Bob


IdeaMan <??????@juno.com> wrote:

I want to step down a 7.2v lithium ion (Li-ion) camcorder battery to 4.7v to power my digital camera for long periods of
time, can someone send me schematic via email or post one that fits my needs. Thank you for help with this. I forgot the
email address: please send to blowphish@juno.com of hypnotech@juno.com .

 

[IdeaMan]

OK, it is a Fisher CameraCorder I want to power from a 7.2v battery by converting to 4.7v. The battery that comes with
the Fisher tapeless camcorder is 4.7v Lithium ion battery rated at 720mAh. The battery can last for one hour continuous
use. I guess that is 720ma continually for one hour. Does this help you with the current draw? If not I can ask Fisher
or Sanyo. Thanks for your help.

On Fri, 30 Apr 2004 20:15:03 +1000, atec <"atec77(notspam)"@hotmail.com> wrote:

<You said>expected current draw ?.
<You said>
<I said>IdeaMan wrote:
<I said>&gt;
<I said>&gt; I want to step down a 7.2v lithium ion (Li-ion) camcorder battery to 4.7v to power my digital camera for long
periods of
<I said>&gt; time, can someone send me schematic via email or post one that fits my needs. Thank you for help with this. I
forgot the
<I said>&gt; email address: please send to blowphish@juno.com of hypnotech@juno.com .

 

[Bill Ruys]

The good old LM317 comes immediately to mind. Most data sheets on these
also have plenty of application notes and circuit examples.

http://www.national.com/ds/LM/LM117.pdf

Cheers,
Bill Ruys.

"IdeaMan" &lt;??????@juno.com&gt; wrote in message
news:h9g6905cc7b5fkufn169lhkghc7ldm4mg1@4ax.com...

OK, it is a Fisher CameraCorder I want to power from a 7.2v battery by
converting to 4.7v. The battery that comes with
the Fisher tapeless camcorder is 4.7v Lithium ion battery rated at 720mAh.
The battery can last for one hour continuous
use. I guess that is 720ma continually for one hour. Does this help you
with the current draw? If not I can ask Fisher
or Sanyo. Thanks for your help.

On Fri, 30 Apr 2004 20:15:03 +1000, atec &lt;"atec77(notspam)"@hotmail.com
wrote:

You said&gt;expected current draw ?.
You said
I said&gt;IdeaMan wrote:
I said
I said&gt;&gt; I want to step down a 7.2v lithium ion (Li-ion) camcorder
battery to 4.7v to power my digital camera for long
periods of
I said&gt;&gt; time, can someone send me schematic via email or post one that
fits my needs. Thank you for help with this. I
forgot the
I said&gt;&gt; email address: please send to blowphish@juno.com of
hypnotech@juno.com .