electronics techie help !! scorpion ESC

[jasoncook]

Hi all firstly can any one id the component in the attached pic.its green with a silver black white and blue stripe on it. Well i recently came into possesion of a scorpion esc and moter 3 flights later just beeps so I contacted the importer /supplier and with honestly told them it was in warranty but i did not buy it, scorpion warranty is not transferrable !! So they said send it back for a 35% disc on a new one which aint too bad . So i pulled it apart and traced the fault to the green possible resister ? on the signal wire, By passed this and it works a treat but i need to know what it does or did Thanks Jason

[challis349]

That will be a resistor, size wise, someone like Steve (xygax if I've spelt it right lol) is probably best to tell you, as I can't remember the colours

[xygax]

It looks like a small rf choke i would think all the resistors are surface mount on the speed controller this is most likly the supply to the electronics. can you get a real close in focus picture of where it came from it may be easy to identify from that

From the colour code

Blue = six
White = nine
black = zero
silver = x10^2(or 3) i cant remember

so its a 680Uh choke most liklely as the white is probably grey

Steve

[jasoncook]

Hi it was inline on the sinal wire before it attached to the pcb. When i removed the heat shrink the end fell off looks to have a black solid core with windings around the outside. Its 7mm long not inc the connection wires the white stripe could be grey Thanks Jason

[xygax]

Its a choke for sure... the wire thingy gives it away EPCOS|B78108S1684J|INDUCTOR, AXIAL, 680UH | Farnell United Kingdom

its somthing like that one
s

[Cagey]

Hey Jason, sorry to hijack your post, but looking at your avatar sort of gives us a clue don't it.

[jasoncook]

Yes I am a sparky but dont do that much with electronics. So is it needed Cheers Jason

[Cagey]

Yes I am a sparky but dont do that much with electronics. So is it needed Cheers Jason

Ain't an electronics wizz either, but there's a good chance it being a choke it's there as a R/F preventative measure, not a good thing to by-pass with all the leccy sh*t buzzing around the R/X etc. Be useful to know what an expert thinks there wouldn't it. Watching this with interest.

[pchristy]

Xygax is right, its definitely a choke, and there to prevent voltage spikes making their way back into the receiver.

You'll probably get away without it as long as there is a good solid signal, but you'll run into problems as the signal strength drops.

It should be possible to work out the value given a clearer photo, but again, xygax is probably pretty close with his estimate.

Because it is in the signal lead, it won't be carrying much current, so the inherent resistance won't be too important. Too high a value could start to round off the edges of the pulses, which would reduce the resolution, but the input impedance of the circuit beyond is probably quite high, so again, I agree with xygax' estimate.

[jasoncook]

Hi the bands are definatly Blue Grey black and Silver.I have just had a magnifier on it. So if the site i have been on is right it 6 x 8 x1 =68 uH with a tolerance of 10% .Does that sound right and would maplin sell them ?? cheers Jason

[cjcj1949]

You have a Farnell part number. Just order it from them. Chokes are a bit dubious in signal leads anyway. Some escs have them, others don't. I'm not sure why one should be in a signal lead. I would think it would make things worse rather than better. Do a range check before flying, there may be a reason it's there than only the designer knows about.

[jasoncook]

Hi thanks for all the help but does the black zero make it 680 or 68 as its a multipler ???