[NSRCA-discussion] Voltage regulator maintenance/replacement/reliability

[rcmaster199 at aol.com]

Chris,
 
One more thing to consider regarding airborne VRs. I am not sure of the circuitry in your failed VR however, in Ed's VR design, he uses a heat sink on the device to absorb the heat build up due to the resistive voltage drop. Ed stated that if the voltage is regulated to say 5.5 volts from the 7.4 nominal voltage of the Li-ion or LiPo, the heat generated and requiring dissipation isn't trivial. 
 
If the regulated voltage is closer to nominal, say 6.5V, things stay happier longer without heat sinks. He gave me a heat sink regardless and just in case things gothot for some reason, but so far it isn't needed. I'm not trying to sell Ed's gizmo, I'm not sure he wants that much business. Only pointing out that there are a couple ways these designs could be approached and be effective. Reliability is another matter that can only be achieved in time
 
Matt
 
-----Original Message-----
From: White, Chris <chris at ssd.fsi.com>
To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
Sent: Fri, 16 Jun 2006 07:25:57 -0500
Subject: [NSRCA-discussion] Voltage regulator maintenance/replacement/reliability


I know when a regulator fails when using a li-on battery the results are catastrophic.   (lost one that way with a miracle switch)  How often should a voltage regulator be replaced?  Is one VR better than another?  Are there any checks which can be done to curtail disaster.
 
At this point I prefer flying 5C non-regulated nimh or nicads….just to take the VR out of the loop.   I still have an airplane which has Li-on’s and am thinking hard about how far I should push the regulator.   Airplane is probably 5-6 years old and equipment is probably original radio stuff.  I have 153 flights on it myself and don’t know how many the previous owners put on it.  (The onboard Li-on is 2004 with the 153 flights….should it be replaced?)
 
Your input is appreciated!
Chris
 



From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of John Ferrell
Sent: Thursday, June 15, 2006 4:48 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] JR and un-regulated 6V
 
Three-terminal regulators dissipate the unused part of the power.
My Prophecy takes about 135 mils per flight to recharge. There are a lot of factors that affect this number, especially airframe vibration.
I keep an eye on it and am more worried about it being consistent rather than some value. 
 
John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US
----- Original Message ----- 
From: Wayne Galligan 
To: NSRCA Mailing List 
Sent: Thursday, June 15, 2006 10:21 AM
Subject: Re: [NSRCA-discussion] JR and un-regulated 6V
 
Does running a regulator, like a 5.1v-5.5v or 6.0v regulator, have any signifigant draw on the battery as it regulates the voltage?  I have been using the MPI Miracle switch that regulates to 6v.  I can get (4) 15 min flights on a 1650mil NiMh pack(Sanyo) before my ESC says to stop flying.
I will put back about 700-750 mil on the recharge.
 
Wayne Galligan 
----- Original Message ----- 
From: White, Chris 
To: NSRCA Mailing List 
Sent: Thursday, June 15, 2006 7:54 AM
Subject: Re: [NSRCA-discussion] JR and un-regulated 6V
 
Hi Matt,
Are you using low-impedence nimh packs?   Would you divulge your battery source?
 
Thanks, Chris
 



From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of rcmaster199 at aol.com
Sent: Wednesday, June 14, 2006 5:03 PM
To: nsrca-discussion at lists.nsrca.org
Subject: Re: [NSRCA-discussion] JR and un-regulated 6V
 
I am doing that with NO problems. Fast charged on the way to field most of the time, with a Serius fast charger. In my set-up, a 1650ma NiMH lasts about 3 flights longer than a 4 cell pack of equivalent capacity. Equivalent ending cell voltages of 1.20v unloaded (1.15V loaded with 1000 ma draw) for either battery. 
 
Getting greater torque and speed as well as longer flight time. Best all around
 
MattK

-----Original Message-----
From: Gene Maurice <gene.maurice at comcast.net>
To: 'NSRCA Mailing List' <nsrca-discussion at lists.nsrca.org>
Sent: Wed, 14 Jun 2006 15:36:18 -0500
Subject: [NSRCA-discussion] JR and un-regulated 6V
Anyone aware of any issues running unregulated 6v Nimh pack with JR Digital
servos??  
 
 
 
Gene Maurice
gene.maurice at comcast.net
Plano, TX
AMA 3408, NSRCA 877
 
 
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