Subject:
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Re: Modifying the 6272c01 Electric RC Race Buggy Battery Receiver Unit with Auxiliary Output
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Newsgroups:
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lugnet.parts.mod
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Date:
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Wed, 18 May 2005 07:45:17 GMT
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Viewed:
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8927 times
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On 5/17/05, Tim David <talltim@hotmail.com> wrote:
> Has anyone had any experience with doing this? Basically I want to take the
> innards of one and put it in as small a 'brick' as possible, add a power input
> to allow connection of external battery box/es and a connector to allow remote
> connection of the aerial.
>
> I have opened my one up, basically there is a main double sided PCB with the
> on/off and RC channnel switches surface mounted on the bottom and the aerial
> mount on the top (a brass screw threaded component) Also mounted on the top
> side
> is a daughter board with the main and auxiliary output connections. This
> connected by about eight rigid pins. The steering motor is wired directly to
> the
> main board and also has a control PCB which works by wipers connecting various
> sections of the track as the axle turns.
> See pics http://www.brickshelf.com/cgi-bin/gallery.cgi?f=129791 when moderated
>
> I am thinking that cutting the rigid pins to the daughterboard and adding a
> section of ribbon cable to allow it to be placed alongside the main board
> would
> be pretty simple. I would like to convert the steering motor output to a
> standard output (at present the motor moves about 90% off a cetral position,
> returning to centre when the control is released) and I suspect I could do
> this
> by removing or bypassng the control PCB, however while I understand what it
> does
> I don't understand how it does it so I'm not sure exactly what to do.
> The other element that is causing me concern is the large 'thing' in the
> middle
> of the main PCB. I don't know what it is or what it does but it needs moving
> as
> it sticks out far further on that side of the board than anything else.
>
> Basically I'm looking for anay tips, advice etc on how to go about this and
> any
> no-no's as well!
>
> Tim
Tim,
The "large thing" looks like some kind of coil+ferrite core to me.
AFAIK That is really part of the tuned circuit for the radio
reception.
Now something that strikes me as really interesting is the operation
of the steering motor. Is it a standard motor, or is it actually a
servo? If by modification you can get servo control out of a Lego
device- that would be really useful. If you have an Oscilloscope -
maybe you could probe the motor control boards inputs and outputs,
then describe the wave forms here. This would probably determine the
control method - although it can be a little difficult to tell between
simple motor PWM and servo motor control PWM.
I see no reason that the pin cutting/ribbon cable wouldnt work, but
please be aware that if these are carrying currents to operate the
motors, they may be relatively high current connections. In other
words - a ribbon cable may be too thin. I you have a multimeter- I
suggest you probe these connections to find out what kind of signal is
going through them.
Good luck - this is an interesting endevour, I do not own one of these
RC motors, but it would be very useful to the community to see a
circuit diagram for this.
Orion
--
http://orionrobots.co.uk - Build Robots
Online Castle Building RPG -
http://www.darkthrone.com/recruit.dt?uid=V30311Q30294A30328K30226H30311D30345
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