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<DIV><FONT face=Arial size=2>To tell the truth, I have never seen a Lithium-Ion
battery pack fail other than getting old and having very high internal
resistance. I could perceive of a condition where the cells became
unmatched and one discharged before the other for some reason and
became essentially a shorted cell with no fire. That is the
configuration I simulated and it worked fine. One could also put a diode
across each cell so if a cell opened you would still have voltage to
the receiver. I haven't tried it with the added diode drop but Prolines
worked with three NiCd cells plus a diode drop 35 years ago. Not sure how
low the current radios will go.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jim O</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=fhhuber@clearwire.net href="mailto:fhhuber@clearwire.net">Fred
Huber</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 06, 2006 1:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
regulators</DIV>
<DIV><BR></DIV>
<DIV><FONT size=2>Well.. loss of a cell in a 2 cell LiPo usually results in no
voltage (open circuit) </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>And, if one cell becomes a dead short (maybe a LiPo
fire from the shorted cell...), you have 3.7V nominal. With a load on that,
(and the regulator's .2 v drop) you'll be likely to go under the
operating voltage of the RX. </FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>So dropping a cell in a 2 cell LiPo pack is probably going
to mean a complete loss of control.</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=joddino@socal.rr.com
href="mailto:joddino@socal.rr.com">J.Oddino</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 06, 2006
12:47 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
regulators</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>No. As long as his battery is .2 volts
above the regulated voltage (5.7) he is okay. This means it would
regulate down to a battery voltage of 5.9. If the input falls below
5.9, say to 5.5 the output will be about .2 volts less or 5.3. That is
why the system will not quit if you lost one cell in your two cell
LiPoly pack.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jim O</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jivey61@bellsouth.net
href="mailto:jivey61@bellsouth.net">jivey61@bellsouth.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 06, 2006
5:52 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
regulators</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Dave</FONT></DIV>
<DIV><FONT face=Arial size=2>Understand what you say but does he have a
problem with his lower than regulated volts.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jim I</FONT></DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=DaveL322@comcast.net
href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, December 06, 2006
8:37 AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion]
regulators</DIV>
<DIV><BR></DIV>
<DIV>Bob,</DIV>
<DIV>You're right, the voltage out should stay constant.</DIV>
<DIV> </DIV>
<DIV>Jim,</DIV>
<DIV>The 480 is more than capable of maintaining 6.11 volts under a 1500
mah load - and this is shown by Bob's test where the 480 holds 7.2 volts
under direct load. The 480 will actually maintain 6.11 volts with
substantially higher load (upwards of 5000 mah).</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV><BR>Dave Lockhart</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">--------------
Original message -------------- <BR>From:
<jivey61@bellsouth.net> <BR><BR>> Robt <BR>> Your battery
is 480 mah and you are trying to make it produce <BR>>
500mah,1000mah,and 1500mah. The battery does not have the capacity to
<BR>> produce these currants.The regulator is ok. <BR>> <BR>>
Jim Ivey <BR>> ----- Original Message ----- <BR>> From: "Robert
Mairs" <ROBERTM@SSSNET.COM><BR>> To: "NSRCA Mailing List"
<NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> Sent: Wednesday, December
06, 2006 7:53 AM <BR>> Subject: [NSRCA-discussion] regulators
<BR>> <BR>> <BR>> > I've got a Jaico that regulates to
6.11 volts. Using a 480 mah TP lipo, <BR>> > and the Jaico, I
got the following. <BR>> > <BR>> > no load, 6.11v <BR>>
> 500mah load, 5.72v <BR>> > 1A load, 5.63v <BR>> >
1.5A load, 5.54v <BR>> > <BR>&g! t; > Just with the
battery, no regulator I get <BR>> > <BR>> > no load, 8.2v
<BR>> > 500mah, 7.84v <BR>> > 1A, 7.51v <BR>> >
1.5A, 7.2v <BR>> > <BR>> > I don't understand. Why doesn't
the regulated voltage stay at 6.11v with <BR>> a <BR>> >
load? I always thought using a regulator was supposed to give you a
<BR>> > constant voltage so the servos reaction would always be
the same, yet it <BR>> > acts just like a battery, just not as
great a drop off it seems. <BR>> > <BR>> > <BR>> >
_______________________________________________ <BR>> >
NSRCA-discussion mailing list <BR>> >
NSRCA-discussion@lists.nsrca.org <BR>> >
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion <BR>>
<BR>> _______________________________________________ <BR>>
NSRCA-discussion mailing list <BR>>
NSRCA-discussion@lists.nsrca.org <BR>>
http://lists.nsrca.org/mailman/listinfo/nsrca-discussion </! BLOCKQU
OTE>
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