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2.4G Spektrum Radios Spektrum 2.4 Gigahertz Radios and Technology |
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03-21-2008, 01:28 AM | #41 (permalink) |
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Join Date: Aug 2007
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QUICK EASY SIMPLE
My logic is make it reverseable if possible. I never like drilling holes if there is another way. Changing to a LIPO on my DX7 was simple. If anyone needs to know how to setup the LiPo battery or install an ON indicator with simple plug-in plug-out modifications I will be happy to put up some pix. But here it is in text form.
A simple description of what I did is: http://www.hobbycity.com/hobbycity/s...idProduct=5280 [Battery comes with an inbuilt CPM (Cell Protection Module) which stops the pack from being over-discharged due to slow residual drain.] 1.Purchase a battery from Hobbycity. 2.Slice off the plug and splice on the plug from your NiMh battery.(heat shirink joints) 3.Include in series a GP diode or 1N4001 will suffice (only needs to carry 100ma) 4.Plug it in to existing socket and pack in some foam to leave in TX, no need to remove for charging. Normal socket will not work because of diode.(no accidents) 5.Connect balance lead to charger. 6.Modify balance lead by connecting main power leads to each side of balance plug.(works well on my BC6) Indicator light. One bright coloured LED with suitable resistor for 12v (250 ohm to 680 ohm - depending on your led. mine is bright on 12ma) Very light connecting wire maximum 15cm - (6") long with resistor on opp end to led. 1.Cut some stiff wire from one side of the resistor and solder to one lead. 2.Solder the resistor to the other lead and leaving the wire long enough to act as a plug. 3.Plug both wires into the power socket on the upper circuit board in the back of the DX7.(No probs removing cover- manual tells how to adjust tension by removing cover) Because of the resistor and the fact the led is polarised just plug in till it lights. This power is direct from the main switch, so it is a POWER ON indicator. The led is then sandwiched between the case sides just next to the aerial. This position gives a perfect on light without pointing the led into your face. It is perfect when you are packing your TX away because you cant miss it. If anyone disagrees please let me know.. no one is perfect (I think) I am only too happy to answer any questions. I have already received an untold amount of help myself from this group. Dennis
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03-21-2008, 05:37 AM | #42 (permalink) | |
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Join Date: Dec 2007
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diode & battery
Quote:
Thank you for the additional info. I went to My Hobby City and read the reviews about the battery. There was a reference to a thread about the use a lipos in TX. The above quote is from there. My question is about using the diode because of the following statement "Sensitivity to high power supply impedance makes use of diodes connected in series with battery (as proposed by someone in this thread) a no-no since this raises the impedance to dangerous values." Do you have any thoughts on this? Thank you for your reply with the additional info about your installation |
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03-21-2008, 07:46 PM | #43 (permalink) |
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Join Date: Aug 2007
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Ulterior motives on Diodes with LiPo's
There must be some ulterior motive by people against diodes on LiPo batteries.
There are some fairytales going around just to persuade people to seek incorrect alternate paths. A diode has certain properties in its makeup. (P & N properties for those technically minded.) These properties act as a non return valve for electricity (electron flow). A bi-product of this action of non-return is a voltage drop of around .6 of a volt. The first benefit derived in our case on the DX7 is the lowering of the battery voltage from 12.6v to 12v (in a fully charged state for the LiPo).(The DX7 only sees this lower voltage and doesnt know you are using a diode). The second benefit is a safety valve protecting the battery from accidental use of the standard charger. The current draw for a stable power platform for the DX7 (which allows continuous steady transmission) is between 100 to 200 milliamps.(This does not depend on the size of your model or how fast you fly!) The diode will allow 1000 milliamps continuous and a surge to 50,000 milliamps.(yes 50 amps) (1N4001) There is no problem using a diode when a direct current (DC) power source is required. EVERY DC powersupply (apart from batteries) has them. My DX7 has been fitted with a Lipo + diode for 4 months, and an LED on indicatior for 3 months without any problems. The only thing I notice is bloody thing never needs charging. As well as the great yellow light if I put it in the carry box still turned on. Dennis
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03-25-2008, 05:02 AM | #44 (permalink) | |
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Join Date: Dec 2007
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Diode voltage drop
Hi Dennis,
LED: Do you have it sticking outside the case, standing / sandwiched between the cover next to the antenna? Did you cut the case? Thanks again for the update, grant Quote:
Last edited by gww528; 03-25-2008 at 07:05 AM.. Reason: updated information |
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03-31-2008, 10:56 PM | #45 (permalink) |
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It's a linear voltage regulator. They did not use a copper heat sink as per the component spec sheet so it is prone to overheating. Warm to the touch at 10.5 V. Too hot to hold at 12.6V .... hence the switch to a dimension engineering 3.3 V switching regulator...
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04-01-2008, 06:30 AM | #46 (permalink) |
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What about this battery
Lightning Power 2650mAh 4C 11.1V Transmitter Battery
http://www.helihobby.com/html/lithiu...l#PARTLP-B0106 What do you think about this battery? It seems to have connectors for both Futaba and Spektrum. in my case I want to use it for my DX-7. It should just be "plug & play" shouldn't it. And of course, I can't use the standard charger connection on the radio any more. I have to use the balance contact on the battry instead. / Stolpe
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T-Rex 450SE V2 mini V-bar, T-Rex 500ESP V-bar, HB CP2, Blade mSR Spektrum DX8 radio + Raydiowarm Hyperion EOS 0615i Duo III + 400W 24V 16,7A power supply |
04-06-2008, 02:32 PM | #47 (permalink) |
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TrueRC has a lipo that fits perfectly and it comes with the white JR connector. $30
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04-06-2008, 09:46 PM | #48 (permalink) | |
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Quote:
If you get this battery I want to hear about it too.
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04-16-2008, 10:59 PM | #49 (permalink) |
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Join Date: Apr 2008
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Lipo in Esky radio....help needed
hi everyone, i am new to RC Heli flying...need some help here..
firstly i am sorry if i post this in the wrong thread...but i feel that this is the most suitable thread to post and obtain answers.. I own a Esky Lama V4, been flying for about 2 months, noticed that my radio batteries run out very fast as it is using 8AA alkaline batteries, so i decided to change it to 8AA Nicd batteries, but found out that 8AA Nicad batteries will only produce 9.6v as each one is only 1.2v at fully charged. I wont able to fly with that battery level. through reading the forum found out that some of the members have tried changing their battery from Nicd battery pack(original) to 3s lipo 11.1v and have full satisfaction.... so my question is can i substitute my alkaline batteries(originally use) to a 3s Lipo 11.1v? what should i do if i can substitute to 3s lipo 11.1v....can i follow the steps posted in this thread previously... tq first for all the replies.... |
04-17-2008, 07:39 AM | #50 (permalink) | ||
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Build my own batterypack
I bulid my own batterypack instead. Just bougt 8 AA batteries rechargable of course. I got the duracell 2650 mah on a local store. I also bought the mini JST connector to attach to the pack.
Then I soldered them together and now I have my own home made batterypack, the batterytime have been increased alot. Take a look at theese two instructions and I thinkt that maybe you want to give it a try. / Stolpe http://www.yourzagi.com/battery.htm
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T-Rex 450SE V2 mini V-bar, T-Rex 500ESP V-bar, HB CP2, Blade mSR Spektrum DX8 radio + Raydiowarm Hyperion EOS 0615i Duo III + 400W 24V 16,7A power supply |
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04-18-2008, 10:42 PM | #52 (permalink) |
Join Date: Nov 2007
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hi
i tried this mod using an 1800mah 11.1v lipo on the esky 6ch TX and ive noticed that the circuit board below the throttle stick gets REALLY hot, so hot i cant keep my thumb on it for more than a few seconds! is this just becuase esky is rubbish or do you think a 9.6v lipo would be best? i used to have the DX7 and was gonna do this mod but after this discovery im not so sure 11.1v lipo is a good idea. id hate to fry the dx6i im about to get by doing this mod. thanks |
04-21-2008, 12:01 AM | #53 (permalink) |
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Anything you can't hold your finger to for more than a few seconds is bad electronically. I would suggest a heat gun though so we can compare apples to green apples.
I have 2 chargeers both charge nimh. I have never flown so much in a day that I have drained my DX7. If you do so I will feel kind of lamish.
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04-21-2008, 09:44 AM | #54 (permalink) | |
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Quote:
I've used a GE Power RC pack (11.1V 2200mAh - Ebay), it fits like a glove. I fitted a diode inline with the positive lead which means I can leave the DX7's charge jack alone with no risk of battery damage if the old charger gets plugged for some reason and it drops the max voltage to the system to 11.8V. I also fitted a charging lead between the diode and the battery. I do drop the battery out of the tx to charge it but I leave it connected. Works well for me.
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'If the wings are travelling faster than the fuselage, it's probably a helicopter -- and therefore, unsafe.' 'If something hasn't broken on your helicopter, it's about to.' |
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04-28-2008, 08:00 PM | #55 (permalink) | |
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Join Date: Feb 2008
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Spectrum doesn't like it....
Quote:
check the first one on the top.... I think I am going to stick with a nice but bigger NiMh like this one: http://www.maxamps.com/MA-2500-TX-JR-Brick.htm Plug n Play .
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08-05-2008, 05:14 PM | #56 (permalink) |
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Join Date: Jul 2007
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JR X9303/DX9 has LM2937-3.3 voltage regulator
LM2937-3.3
400mA and 500mA Voltage Regulator Generic P/N 2937-3.3 Contents General Description Features Datasheet Package Availability, Models, Samples & Pricing Positive Voltage - Fixed Family Parametric Table Multiple Output Capability No On/Off Pin No Error Flag No Input Voltage, min (Volt) 4.75 Input Voltage, max (Volt) 26 Output Current, max 400 mA,500 mA Quiescent Current, typ (mA) 2 Output Voltage (Volt) 3.30 Watchdog No it only looses little power and has max 26 volt input |
08-05-2008, 06:45 PM | #57 (permalink) |
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which regulator is used in the dx7?
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This heli stuff is a pretty deep Rabbit hole, you just have to decide how deep you are willing to go... |
09-08-2009, 04:11 PM | #58 (permalink) |
Join Date: Apr 2009
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I asked this in another thread, but I just want to make sure I'm doing the right thing:
I have a 3 cell 11.1 v lipo coming for my DX7. I've read a few places about >12 v from the battery is not good for the transmitter regulator. I've also read some place a diode in series with the battery to drop the voltage, and I've seen others that replace the regulator itself. My question, is it OK to just charge the lipo up to ~12 v or less and use it that way? |
09-08-2009, 07:17 PM | #59 (permalink) | |
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Join Date: Dec 2007
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Quote:
Replacing the regulator you will void the warranty. You could charge to 12v but most likely you will charge it to full voltage while you do something else and forget about the charging. |
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09-09-2009, 05:59 AM | #60 (permalink) | |
Join Date: Apr 2009
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Quote:
Looking at the picture above, you put the diode in the positive lead between the battery pack and the plug in the receiver, right? The picture confused me a little because what I think I see is two white wires coming out of the battery pack. Thanks! |
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