searching for light weight 3v to 7-8v dc/dc converter

W

William Watson

Guest
Hello Everyone,

I am looking for a light weight (ca. 10 grams) 3v to 7-8v dc/dc
converter to use in an elctric R/C plane. I have some basic
electronics knowledge and would try a DIY cicuit if I could find one.
It would be used to drive a Graupner 400 speed motor. The motor can
draw 15 amps for short periods. I found what I was looking for at
22fly.com, but he does not seem to be actively selling these anymore.
Can anyone point me in the right direction to find one to buy or at
least a circuit digram that I might build one from.

Best Regards,
Bill
 
In article <db50dc5e.0401160426.5ffc15f0@posting.google.com>,
wjne2003@yahoo.com mentioned...
Hello Everyone,

I am looking for a light weight (ca. 10 grams) 3v to 7-8v dc/dc
converter to use in an elctric R/C plane. I have some basic
electronics knowledge and would try a DIY cicuit if I could find one.
It would be used to drive a Graupner 400 speed motor. The motor can
draw 15 amps for short periods. I found what I was looking for at
22fly.com, but he does not seem to be actively selling these anymore.
Can anyone point me in the right direction to find one to buy or at
least a circuit digram that I might build one from.

Best Regards,
Bill
Click to expand...
Well, first off, if it draws 15A at 7 to 8V, then it's gonna draw much
more at 3V, something like 50A or more assuming high efficiency, which
you may not be able to get.

You need to determine how much power you really need, for how long.
If it's not too long, you may be able to store up enough energy in a
capacitor to supply the peak power.

--
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In article <db50dc5e.0401160426.5ffc15f0@posting.google.com>,
William Watson <wjne2003@yahoo.com> wrote:

I am looking for a light weight (ca. 10 grams) 3v to 7-8v dc/dc
converter to use in an elctric R/C plane. I have some basic
electronics knowledge and would try a DIY cicuit if I could find
one. It would be used to drive a Graupner 400 speed motor. The
motor can draw 15 amps for short periods. I found what I was
looking for at 22fly.com, but he does not seem to be actively
selling these anymore. Can anyone point me in the right direction
to find one to buy or at least a circuit digram that I might
build one from.
Click to expand...
Could you turn your problem upside down?

Find a 7-8V battery with a similar Watt-hour capacity
(so that the size/weight is similar), drive the major
load directly from that, and use a switching regulator
to provide the lower current 3V.

--
Tony Williams.
 
If it's possible then someone over on the E-zone ( THE discussion forum for
electric RC flight) will know how to do it, or more likely they will
already have done it!

http://www.ezonemag.com/

The discussion forums are here..

http://www.rcgroups.com/forums/index.php?topic=air-elec

If they can't help you I'd give up!

Colin
 
It might be easier to rewind the motor with half the number of turns and
thicker wire - or use another motor.



"William Watson" <wjne2003@yahoo.com> wrote in message
news:db50dc5e.0401160426.5ffc15f0@posting.google.com...
Hello Everyone,

I am looking for a light weight (ca. 10 grams) 3v to 7-8v dc/dc
converter to use in an elctric R/C plane. I have some basic
electronics knowledge and would try a DIY cicuit if I could find one.
It would be used to drive a Graupner 400 speed motor. The motor can
draw 15 amps for short periods. I found what I was looking for at
22fly.com, but he does not seem to be actively selling these anymore.
Can anyone point me in the right direction to find one to buy or at
least a circuit digram that I might build one from.

Best Regards,
Bill
Click to expand...
 
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