Radio control cars

[paulh]

I'm sure someone on here will have had experience with them and may be able to help me out.
I have just bought a large rc 4X4 (only cost £2) I've tested it and it works perfectly, however I bought it without a controller.
In my loft I had a very old RC car belonging to my son which was pretty smashed up and I thought that the controller from that may operate the 4X4.
Unfortunately when I tried it, no go.
Methinks, all I have to do is remove the crystal from the old cars receiver and fit it to the new one,(hope you're following this cause I'm confusing myself) however when I opens up the new car hey presto, no crystal (how does it know what frequency it's on without a crystal).

[marky]

Paul you have to have a pair of matching Chrystals 1 for the car & 1 in the Transmitter handset

[paulh]

Hi Mark
Yeh, thats what I thought but there's no crystal in the 4X4s receiver circuitry.

[marky]

BUGGA

[TonyN]

Lots of the cheaper R/C stuff are bacially just toys, the frequency is built into the electronics and you can't mess with much unlike the 'proper' R/C models.

If you know what frequency the new car runs on, you might be able to buy a crystal for your old receiver and work it like that, but don't know for sure.

[Sancho]

Yeah, if you can find out the frequency of the receiver in the new one (it's sometimes on a sticker on the receiver or somewhere on the bottom) you might be able to buy a matching crystal for the transmitter. The bandwidth that's allowed for RC toys is fairly small, so you've got a decent chance of it being in one of the available frequencies (I think there's 6 or 8 or something - they're a different colour each).

If it was me, I'd pull the receiver out of the old one and stick it in the new one. In all likelihood, it's going to be a simple two channel thing and each channel will have a positive and negative to a servo. The worst you can cock it up is to make it go left instead of right and backwards instead of forwards.

[paulh]

Just thought, when I said I tested the 4X4 I used a controller from another rc toy, all I need to do is dismantle that controller and see what crystal it uses and get one the same (brilliant)