Jump to content

Martin Shoebridge

  • Posts

  • Joined

  • Last visited


Everything posted by Martin Shoebridge

  1. Without limit switches, it's tricky. Do you mean no sort of switch at all ? i.e. opto as above?The only other way is to current sense, but that has it's own problems.... sticky gear mid way might indicate a down lock... All in all, it's no simple task, even for an accomplished electronics engineer..
  2. Worth a look...thanks. First time I had no extension lead. Then I fitted an extension lead and same thing, so maybe not........but I will look. One of my other thoughts was a faulty conection in the joystick assembly to the PCB in the TX. A broken/bad connection here will/can put the servo hard over one way or the other, depending on where the break is. ( +5 side or Gnd side.)
  3. I've just picked up on this...... I've had similar problems resulting is crashes, some terminal. The commmon fault is aelerons locking on full, spiralling the plane into the ground. 3 or 4 times now. It's an Arising Star trainer with Irvine 40 engine, Dx& Tx and 6200 receiver.It's not the servos ( replaced) It's not the receiver battery ( pretty sure). I think the most likely is a software glitch with the processor in the TX.Or possibly the receiver. I'm switching to a 5e and a different 6200 while I investigate further.  I did also experience throttle shut downs, but that may have been down to the engine/fuel feed rather than an electronic problem. I'm not looking for suggestions,as they are endless, but maybe hear from others that may have had the same thing. I don't buy the thing about not enough rubber bands. I have 8/10 fitted.All I was doing was circuits and landing appraoches. The last crash came 2 seconds after take off. No time to do anything.
  4. These seem quite god, claiming tohave lots of stock of cut kits on the shelf.
  5. Me too , given up. In the mean time, I've cut 10 sets by hand
  6. Exactly....... plus many more here http://www.rapidonline.com/Electrical-Power/Power-Supplies/Bench-PSUs/100W-Switch-mode-bench-PSU/78617
  7. A sequencer would be a nice project as it has several possible uses, not only undercarriage sequencing...
  8. LOL go to B&Q they have ( last time I looked ) 60/40 leaded solder.........  I agree, about 99% of gadgets now need software to make them work.The Electronics /hardware side is the easy part. The 'smartness' comes from the inginuity of the programmer. I also think that most avenues of our hobby are covered by the likes of Hobby City. If they don't do it, there's probably not a lot of demand for it..... so any new ideas are really hard to find for commercial ventures. But there are niche markets ( fishing buzzers) where ther is still a bob or two to be made. Engine synchronisers is another.... Competing with state of the art stuff ( from China) is entirely possible. There are always plenty of patriotic people that would rather buy from a (reputable) UK company , than save a few bucks by buying from China/HK.
  9.  I can design and make boards..... soldering SM chips is no big deal.Leaded or unleaded is no problem. Unleaded is nowhere near as bad as stated above. It just needs a slightly higher temperature to melt, not a welding gun..... Personally I favour Atmel AVrs...... but PICs are ok is you're a software sadist If anyone has ideas/projects, I'm happy to design PCBs and make production runs etc on a semi commercial basis. 
  10. You're lucky.... they didn't even reply to my quotation request.......
  11. James, could you pm me the spreadsheet for the motor calcs.... thx.
  12. LOL , no, it was after that.( I think) ........cluck cluck... sorry, I meant click click.
  13. I remember building a TX /Rx back in the 60's but the details escape me.....Ali box, pcb, lots of switches....
  14. I was sent this link by a mate.... Truly amazing. Puts a new perspective on 3D flying. Lucky pilot or a true  top gun? http://www.break.com/index/plane-loses-wing-in-mid-flight.html
  15. One is supposed to hang a spring balance on the end of the wire and attach it to a pulling device ( winch type thing) and apply the test force.
  16. A 'pull test' is a QC method for establising that a crimp connection has been done  correctly. This will specify the load that will be applied to the wire in an attempt to pull the wire out of the crimp. It is usually done on a random sample basis. Clearly, this can't be done with 3 core flat wire as used in servo systems. As you say, each to their own.
  17. I agree with you , to a point. Which is worse? A badly done crimp or a soldered joint.? Mil spec/avionics, sure they use crimp, but there is a long line of training and ruthless QC behind the operations. The average modeller, I suggest, will come nowhere near that, hence my suggestion of soldering. One of the problems with these moulded 3  wires is that you can't  do a 'pull test' so how are you going to know that what you have done is good?
  18. That's one really useful web site! Thanks. Just a tip.... unless you are truly proficient at crimping, I would sugggest soldering the cripms instead. But this has it's own problems- vibration. Use hot melt after assembling the connector, then cover in 'sticky' heatshrink to about 30mm down the wire.Use 3:1 ratio shrink. 
  19. Where can you buy connectors and crimps at sensible prices for making your own leads?
  20. Further info....... this article described real time monitoring of the plug current, and how it could be reduced as it's temperature increased. Yes a sophisticated 'keep alive '.
  21. I read a good article about this a while ago. Can't remember where, but it described a 2 stagecontrol . I think it was a construction project rather than a commercial unit. Can anyone point me in the right direction?
  • Create New...