electronics

[plargen]

what dimensions are the argos 12v (£12) drill motors? I'm mostly intrested the length of the motor with the gearbox attached.

the length is about 145 to 150 mm long

[plargen]

does a RadioLink R7EH 7 channel receiver (2.4GHz) need a battery or what ether they're called?

you will either need a battery or a BEC

[gizmo]

Couple of questions here.

What type of wire is best, single core or milti-strand, or doesn't it matter? We have both types just don't know which to use.

Also is robochallenge out of their blue wheles as I orders ome nearly 2 weeks ago and they haven't turned up yet.

[shakesc]

multicore is best - more flexible and less likely to fracture in this sort of application

[typhoon_driver]

James and grant will be busy atm with the prep for the champs coming up but drop them an email and they should get back to you about the wheels

[gizmo]

A question I keep meaning to ask, which pin does what in a standard 3-pin receiver, which one is positive, negative and signal?

[maddox10]

Depends on brand. Some use white red black, other red yellow black.

As far as I know, red and black are powercables, the white or yellow signal cable.

But don't hit me if I'm wrong.

[gizmo]

That's not what I mean, I mean in the receiver it's a radiolink R7EH. I'll add a picture when I have a good enough internet conection, I hope it's enough for now

[RogueTwoRobots]

Generally the bottom row of pins is the negative, middle positive and top row signal wire (white/orange/yellow depending on brand of plugs being put in). Off-hand, I think this is arrangement for the RadioLink 7ch receiver.

Just to make things confusing, the FrSky receivers I use with the 2.4GHz hack modules have this reversed, with the top row of pins being negative and the bottom row being the signal pins.

Either way, the receiver should have markings on it somewhere (try on the side of the casing) indicating what row of pins is what. Positive will be marked with (+), negative (-), and signal will usually be a square wave like this (only decent example I could find):

[gizmo]

Thank you for the response, There are no markings on the receiver I've looked everywhere on it for them, but 1 more question (for now) do you need only 1 BEC? I just want to be sure.