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Type: Posts; User: bgosselin

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  1. Replies
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    Sticky: RE: How to convert an ATX power supply to rc use

    Not sure about your specific charger, but many have a built-in voltmeter that will show you the voltage of the power supply feeding it. If so, you don't really need one on the supply itself unless...
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    Sticky: RE: How to convert an ATX power supply to rc use

    Yeah, that's possible too. Either way, I wasn't trying to pick on Red or anything, just trying to prevent SirNoob from doing something incorrectly. Hopefully, he reposts the actual value. What a...
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    Sticky: RE: How to convert an ATX power supply to rc use

    That was probably a typo (?), but hooking all four 1ohm resistors in parallel will equate to 0.25ohm, which will draw 20A from the 5v line and generate 100w.

    Personally, I'd start by putting...
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    RE: Adjustable voltage 18V PSU

    The only adjustable PSU I've ever built was a linear type (large heavy mains transformer and multiple pass transistors for output regulation). For the current you want, a switching type would be far...
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    RE: Unique Charging Situation

    I agree! If you want a more hassle-free setup, I'd use properly-sized Li-Ion's (or A123 cells) that aren't as prone to issues, similar to what power tools use.

    Really, all Lixx cells need is...
  6. RE: could some body explain this to me please?

    That's a pretty large variance between actual mAh and rated mAh. I would suspect that either the battery is rated very conservatively, the discharge terminal voltage is really low, or the charger is...
  7. RE: could some body explain this to me please?

    Also, I would pay more attention to the amount of mAh taken out during discharge and what the termination voltage is.

    During the charge cycle, the cell heats up near the end and most of that bit...
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    RE: Hot LiPo balancer?

    Yeah, like chuckk2 said, the balancer is discharging the high cell(s) and that is creating heat. IIRC, that balancer (I have one) balances at 150mA, which equates to around 0.6w of heat dissipation...
  9. RE: Lipo Fires Are Real![Fantastic Advice!] Can I ask for further help?

    @raptorboy: While the batteries in laptops, phones, cameras, etc are lithium, your analogy is not quite apples-to-apples. There are some substantial differences between batteries for these devices...
  10. RE: Lipo Fires Are Real![Fantastic Advice!] Can I ask for further help?

    As said, you are good to go as long as they are being charged correctly; proper cell count and amperage settings, and assuming the charger is a quality unit and doesn't malfunction. And ALWAYS...
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    RE: 500mah to 180mah, which resistor?

    Personally, the use of a simple resistor can be tricky to figure once you try to take into account existing output impedance, voltages, etc. The way to go IMO for that small of a current is to use a...
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    RE: Ideal Rx battery for Bird of Time?

    I suppose, but the same thing can be said for any other BEC on the market (including ones built into ESCs). And generally, those fail because current draw is high. I have only had one BEC fail on me...
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    RE: Ideal Rx battery for Bird of Time?

    4 of those LSD cells in series would give you 4.8v nominal at 1500mAh. Not sure where you figured 8000mAh?

    Hmm, I would think going to a lipo with a BEC would be a good choice too. I would think...
  14. RE: Wire a LiPo into a Field Amp for Music?

    I wouldn't use a SERIES adapter for dual 3s packs (would be 22.2v), but rather a PARALLEL adapter. I bet that's what Goldenduff meant though...
  15. RE: Wire a LiPo into a Field Amp for Music?

    "Timing the run" doesn't work so well with audio because current draw (and therefore runtime) varies tremendously with type of audio content (lots of bass vs little), overall volume, amount of...
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    RE: Anyone use this charger?

    I don't use that charger, but the link should be: http://www.hobbyking.com/hobbycity/store/__6478__IMAX_B6_AC_Charger_Discharger_1_6_Cells
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    RE: Hyperion 0606i charging NiMH problems

    Yeah, I guess if I wasn't so lazy to look I would've seen that. :)

    But, you can still test it by not using the built-in supply and hooking up the 12v leads to a car battery or 12v power supply.
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    RE: Hyperion 0606i charging NiMH problems

    Hmm, that is odd. I have two Hyperion chargers (old EOS7i and a newer EOS 0615 duo 3+) and switching display screens doesn't affect the charge process on either of them.

    One other thing to check...
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    RE: Hyperion 0606i charging NiMH problems

    Probably because the NiMHs he's working with are transmitter/receiver packs. Depending on the cell brand/quality, certain batteries respond better to lower charge/discharge rates. For instance, I...
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    RE: Hyperion 0606i charging NiMH problems

    You could try increasing the delta peak sensitivity to something above 3mV. When charging at that low current, I would go by temperature to determine a good delta peak setting. At the end of the...
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    RE: RC Car Jerking.. Is this normal ?

    Yeah, most chargers require a 12v DC power supply. They do this so people can run them off their 12v car battery when at the field. So, if you want to use it at home, you have to come up with a 12v...
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    RE: RC Car Jerking.. Is this normal ?

    I agree with it being the battery's fault. The voltage is likely sagging under load and is getting too low to move the truck right. Until you get a new battery, make sure you have any LVC setting...
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    Sticky: RE: How to convert an ATX power supply to rc use

    I'm out of ideas as well...
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    Sticky: RE: How to convert an ATX power supply to rc use

    Thanks for the pics. Couple points I want to mention though:

    1) The two heatsinks doesn't necessarily mean two rails. Actually usually one heatsink is for the AC mains side switching section...
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    Sticky: RE: How to convert an ATX power supply to rc use

    Ready for a bit of math?

    Charging a 5s pack at 7A requires up to 147w of power (4.2v/cell * 5cells * 7amps). Since the charger is not 100% efficient (typically around 80%), add in another 20% of...
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