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Step 4Getting it to work
Do some testing. Switch on the remote control. If you are very, very lucky, the car might respond ... but I don't think that will happen ;-)
Very, very carefully turn the ferrite core into the coil. Use a small screw driver and very, very carefully turn the ferrite into the core while keeping the remote control switched on. After a while of turning the car should respond. If not, you are not lucky ... If the ferrite is already at the base of the core you need to remove some windings from the coil. Remove a maximum of two windings at once. Repeat the turning of the ferrite. If there is less than 4 windngs left on the coil ... something is terribly wrong. Either you made a mistake while replacing the coil or the starting coil hat not enough windings. In that case you have to start over from the beginnig winding more turns at the start.
If the car responds, make the distance between the remote control and the car bigger. It is a good idea to make someone help you with that. Take the remote as far from the car as the car stops responding. Turn the ferrite then and see if the car starts responding again. At the maximum possible distance you get sharp point while turning where the car responds. This is the best adjustment for you.
In my case 9 windings where perfect. On the picture you can see that the ferrite core is not fully turned into the coil, that's good.
When everything works you need to apply some glue to the coil to make it mechanically stable. Don't forget to fix the ferrite core! You need not to use wax, glue will do too (how poetic ...). If the car is running and the windings on the coil are jumping or the ferrite is vibrating you may loose you adjustment, and the car may stop working ... ;-)
One more thing ... You can change the frequency only in a small frequency band. Changing the frequency from the 27Mhz band to the 40Mhz band requires more work. It might work, but it need not work. There are rc chips that can handle both frequency bands, but they use different filter sets then. Only changing the coil will not work in most cases.
Very, very carefully turn the ferrite core into the coil. Use a small screw driver and very, very carefully turn the ferrite into the core while keeping the remote control switched on. After a while of turning the car should respond. If not, you are not lucky ... If the ferrite is already at the base of the core you need to remove some windings from the coil. Remove a maximum of two windings at once. Repeat the turning of the ferrite. If there is less than 4 windngs left on the coil ... something is terribly wrong. Either you made a mistake while replacing the coil or the starting coil hat not enough windings. In that case you have to start over from the beginnig winding more turns at the start.
If the car responds, make the distance between the remote control and the car bigger. It is a good idea to make someone help you with that. Take the remote as far from the car as the car stops responding. Turn the ferrite then and see if the car starts responding again. At the maximum possible distance you get sharp point while turning where the car responds. This is the best adjustment for you.
In my case 9 windings where perfect. On the picture you can see that the ferrite core is not fully turned into the coil, that's good.
When everything works you need to apply some glue to the coil to make it mechanically stable. Don't forget to fix the ferrite core! You need not to use wax, glue will do too (how poetic ...). If the car is running and the windings on the coil are jumping or the ferrite is vibrating you may loose you adjustment, and the car may stop working ... ;-)
One more thing ... You can change the frequency only in a small frequency band. Changing the frequency from the 27Mhz band to the 40Mhz band requires more work. It might work, but it need not work. There are rc chips that can handle both frequency bands, but they use different filter sets then. Only changing the coil will not work in most cases.
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Dec 21, 2008. 3:25 PMdeweywsu
says:
WOW!! I LOVE projects that show simple steps you can take to mod radio-based circuits. Not too much theory, not too much modification, just simple steps and simple items, most of which you can find around the house. This Instructable was just awesome. Thank you for your work on this! It is very well explained and at a skill level that I think most people will benefit from a great deal. You are a good teacher. Please consider doing something like this again! -Josh Seattle, WA
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