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120V wall plug-in power supply....

asong26

Veteran

VA

Are there any known power supplies, or battery chargers that are capable of providing power to the heli's receiver?

It's very frustrating when the battery dies during the calibration of swash / servos for long time. Obviously, I can go out and buy another battery, but it takes too long to charge.

I am looking for a solution that will allow me to work on the heli in the house for long periods of time without waiting couple of hours at a time for the battery to recharge. And when the battery is low, I also find that the calibration (equal servo movement) goes out of whack.

Thanks.

Andrew

01-02-2007 Over year old.
asong26

Veteran

VA

BTW: I am using a standard 4.8V JR Sport Batteries. I guess I'll need a device that can provide constant 4.8V as required by receiver....

Andrew

01-02-2007 Over year old.
copperclad

Elite Veteran

NY

Hi Andrew
i would think you could try something like this , 5 volt at 3.7 amps

http://www.allelectronics.com/cgi-b...ER_SUPPLY_.html

just cut the plug off it and solder on a servo plug , then plug it into an open RX slot , i haven't tried it but it would be the same as a freshly charged RX battery , with the RX battery still plugged in , it would smooth out any ripple in the charger , at 5 volts the PS should act as a trickle charger if the RX battery is low , and remember a freshly charged RX battery is above 5 volts , HTH , dana

01-02-2007 Over year old.
asong26

Veteran

VA

Thanks Dana.

I receive another PM from someone else warning me that direct wall power may affect the receiver due to sin waves... Do you know if EMI filter on that charger you've posted below will do the necessary filtering of this?

I wonder if anyone had ever tried this. Also, I wonder if I can use an old PC ATX power supply to do this. If my memory serves me correct, one of the wires for the PC cooling fan is rated at around 5V. I could be mistaken. The question is the Amps.

Andrew

01-02-2007 Over year old.
copperclad

Elite Veteran

NY

hi Andrew
yes , some of the cheap power supplies have a ton of ripple and could be a problem , a PC supply would work well as the have very good filtering , and with a PS like this it would only be good with a standard setup like you have ( 4.8 volt RX pack ) if a person was using lipos and a regulator this would be a bad idea , i use a PC supply to power my triton charger and i had to put a load on the 5 volt leg to get it to put out power , for around $30 you can buy a better quality power supply that has good filtering and would supply 5 volts at 5 ~ 10 amps , http://www.allelectronics.com/cgi-b..._3.3V_12A_.html
( the link above shows a PDF that shows how to set a jumper to cause this PS to switch on )
there are many kinds availible , the other thing to mention is the RX switch would have to be on to allow the RX battery to be connected to the circuit , in which case the battery will act as a filter

you have to be carefull using battery chargers for power supplies as they are well known to have little to no filtering , once you get into the better quality switchers the filtering problem is moot as they are made to be very smooth , HTH , dana

01-02-2007 Over year old.
asong26

Veteran

VA

i use a PC supply to power my triton charger and i had to put a load on the 5 volt leg to get it to put out power
Dana,

Can you elaborate on this? What do you mean you have to put on a load? I will not be using this for charging purposes at all, only to power up the heli with consistent power for long period of time. And I will not be using Lipos.

Do I need to worry, or would it be just simple plug and play (with the leads soldered on)?

Andrew

01-02-2007 Over year old.
copperclad

Elite Veteran

NY

hi Andrew
there is a lot of info on the web about using a PC power supplies , some work just as they are and others need either two wires connected together or a load put on them to turn on , mine was a freeby and it needed a load connected to one of the 5 volt outputs , the supply senses this load and switches on , i went to radio shack and bought a plug that matched the plugs on the PS and some ceramic resistors ( people use tail light bulbs too ) and put it all in a small project box , this plugs into the PS and the triton plugs into it , i dragged it up from the basement and here are a few photos , it's a bit dusty as i like to charge on my welding bench , peace of mind with those dang lipos
as i recall the yellow (orange) wire is 12 volt the red wire is 5 and the blacks are ground , you just put a load , either a resistor or a tail light between the red wire and one of the blacks , with mine i needed a pretty good load to get enough 12 volt for the triton , this would be 4 or 5 tail lights in parallel , try a google for " using PS power supplies " , and i am guessing someone has covered it here on RR too

01-02-2007 Over year old.
asong26

Veteran

VA

Dana,

Thanks for the Photo. That explains a lot.

I also have a generator (Motor, Rectifier and Regulator). Since my purpose is only for powering up the heli, not charging, It may make sense to use a wall AC adapter and connect the wires directly to the regulator.

I need to decide the route rather quickly. I wonder why there isn't a easy plug and play device available for something like this. I can't be the only one feeling the need for this....

Andrew

01-02-2007 Over year old.
copperclad

Elite Veteran

NY

hi andrew
here is more info on PC supplies
http://www.rcbatteryclinic.com/
scroll down the list on the left side you will see some info at the bottom
with your generator setup , if you are using one of RAJA's setups it is AC from the motor to the rectifier and then the regulator puts it down to 5.6 volts as i recall , you could still plug a good 5 volt regulator straight into the RX , it would be on the battery side of the regulator , HTH , dana

01-02-2007 Over year old.
playfair

Key Veteran

Rochester, NY

Let me know if you are still looking for a clean 5V DC supply.

I believe I still have a 1 amp commercial solid state power supply around somewhere that is the size of a pack of smokes (cost over $100 new). Can easilly be wired up with an RC plug, and I'm sure it would work great. Puts out around an amp, which is PLENTY to setup with. I'd need to get $25 shipped USPS for it...
5 is for the actual USPS priority mail, and the rest is to motivate me into looking for it!


The sky is our canvas

01-02-2007 Over year old.
GimbalFan

rrProfessor

Big Coppitt Key, FL

Along these lines, I've got an extra no-name puter power supply I'm gonna mod for bench use. It was rated at 350 watts. How do I determine the maximum amperage I can draw from the various voltages I'll be using it for?

op-thwp-thwp-thwp-thwp-thwp-thwp-thwp-thwp-thwp-thwp-thwp-thwp-t

01-02-2007 Over year old.
AirWolfRC

rrProfessor

42½ N, 83½ W

This looks like a good use for the hundred or so 12V/5V regulated power supplies I have in stock that were made for external floppy drives. Just hook up a lead to the 5V side and plug it into the receiver.

01-03-2007 Over year old.
HOMEPAGE  
playfair

Key Veteran

Rochester, NY

Airwolf, hopefully you give asong26 commission on his idea!

Gimble- Not sure how puter PS's are rated; the supplies I have give a total power or current for each output voltage. Perhaps the total combination has to be 350 watts? Some one here should know?


The sky is our canvas

01-03-2007 Over year old.
AirWolfRC

rrProfessor

42½ N, 83½ W

Computer PS's ratings are usually the total delivered power.
Sometimes the individual amps per voltage listed can not all be delivered simultaneously.

01-03-2007 Over year old.
HOMEPAGE  
copperclad

Elite Veteran

NY

Perhaps the total combination has to be 350 watts?
hi
yes , it's the total i looked up a 200 watt PC PS ( 3.3V @ 14 A , 5V @ 16 A , 12 V @ 6A = 198 WATTS ) , dana

01-03-2007 Over year old.
asong26

Veteran

VA

AirWolf,

Will you be testing this? If it works, this would be a great solution. No commission necessary

5V lead on the ATX power supply should do it I think.... However, I would test it on a very cheap, ready to throw away receivers just in case.

If this works, we all have at least 1 or 2 of these things lying around. And even at new prices, you can get one for $20 - $30 bucks. You can even buy a purpose built el-cheapo ones with much lower wattage at teens.

As you can see above, copperclad (Dana) has already done this, but for battery charging solution. I would like to get on this project ASAP. I sincerely believe that having peak constant power will give your heli much more accuracy when calibrating for pitch, swash leveling, cyclic, etc...,. Because I have seen servos slow down when batteries are weak.

Andrew

01-03-2007 Over year old.
asong26

Veteran

VA

Dana,

Will 5V @ 16Amps work for providing smooth power, or is that too much amps?

Andrew

01-03-2007 Over year old.
asong26

Veteran

VA

If it's too much, may be we should just use the 12V @ 6Amps, and pass it through a small regulator....

Andrew

01-03-2007 Over year old.
AirWolfRC

rrProfessor

42½ N, 83½ W

If you want to use a computer ps, then you're all set.
Use it for a 12V supply for charging and also hook a left over battery lead to the 5V output for bench setup use at the same time. You may already have a load connected to the 5V line anyway.

Another nice advantage of using a computer ps is that if you accidentally short the leads together, the ps will shut down by itself. To reset the ps, just turn it off, replace the short with a long and turn it back on.

01-03-2007 Over year old.
HOMEPAGE  
copperclad

Elite Veteran

NY

hi Andrew
your gasser may draw what 3 or 4 amps tops with digital servos , just guessing , having a 20 amp supply wont hurt , the RX and servos will draw just what they need , it only means the PS could supply more , computer supplies are very good at delivering smooth ripple free voltage , dana

01-03-2007 Over year old.
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120V wall plug-in power supply....

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