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Old Apr 08, 2011, 07:42 PM
Cessna 172H driver
acam37's Avatar
lufkin,tx USA
Joined Nov 2003
87 Posts
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Voltage regulator for TXmitter battery

I recently put a 3 cell lipo in my Hitec optic 6 transmitter and have had great success with it, until I bought a 2.4GHz Hitec module for an upgrade. With a fully charged battery which was 12.1v it apparently fried the module. Tech support told me it can't handle the voltage and needs a regulator or go back to the Ni-Cad pack. I need some help in locating the right regulator to drop the voltage to around 10v. Is there an easy plug in or do I have to build one?
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Old Apr 08, 2011, 08:58 PM
Frequent Flyer
whitecrest's Avatar
Orleans, MA
Joined Feb 2007
2,105 Posts
Three forward-biased diodes, in series, in the power input should drop your voltage about 2.1 volts (.7 x 3). They would probably only need to handle about 500ma to safely conduct the transmitter current. A local Radio Shack should be able to supply them.
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Old Apr 08, 2011, 09:04 PM
Spoooooon!
TheTick's Avatar
San Fernando Valley, California, United States
Joined May 2003
3,791 Posts
Have you considered using some 2000mah eneloop cells instead? No regulator necessary.
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Old Apr 08, 2011, 11:03 PM
volare est vivere
ray foley's Avatar
United States, OH, Toledo
Joined Jan 2005
2,053 Posts
hi there from Toledo

I recently went to 3s lipo 2200 mah for my xmtr, a Futaba 9cap super. I used two diodes in series in a 3" servo extension in the red lead. This modified extension was connected between the battery and the xmtr. The voltage was reduced by about 1.4 VDC or 11.2VDC which is less than the fully charged voltage of 8s nicads or 8s nimhs. Of course Charging will be handled out of the transmitter by a balancing charger and then reinstalled. Safety first with lipos for sure.

ciao -rjf
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Old Apr 09, 2011, 09:16 AM
Pompano Hill Flyers
Miami Mike's Avatar
Miami Lakes, Florida, USA
Joined Mar 2003
8,486 Posts
It never ceases to amaze me what extreme measures people will go through to convert their transmitters to LiPo cells when they can use low-self-discharge NiMh cells and get the same benefits and more without any drawbacks whatsoever.

Miami Mike's Top Ten Reasons to Use NiMh Cells in Your Radio
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Old Apr 09, 2011, 12:25 PM
Registered User
USA
Joined Jan 2002
4,861 Posts
Quote:
Originally Posted by Miami Mike View Post
It never ceases to amaze me what extreme measures people will go through to convert their transmitters to LiPo cells when they can use low-self-discharge NiMh cells and get the same benefits and more without any drawbacks whatsoever.
+1. I don't get it either.
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Old Apr 09, 2011, 05:58 PM
who dares wins
like2fly!'s Avatar
London,England
Joined Apr 2005
1,853 Posts
eneloops, you wont look back
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Old Apr 10, 2011, 11:18 AM
Registered User
Salem, Oregon
Joined Dec 2008
125 Posts
+ 1 on using Eneloops. I get mine here: http://www.hangtimes.com/txpacks.html
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Old Apr 10, 2011, 12:37 PM
Proud to eat Kraut ;-)
Julez's Avatar
Germany
Joined Dec 2003
5,374 Posts
Install this to get teh voltage down:

http://dimensionengineering.com/DE-SWADJ.htm

Note, that the voltage alarm is compromised by installing it.

Otherwise, use multiple diodes in series as explained here:

http://www.rcgroups.com/forums/showt...=2#post6511569

http://www.rcgroups.com/forums/showt...=606427&page=3
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