Controlling an RC Car

Hi there..just as a small question - how do you control a DC motor that runs with tens of Ampere? Are there any drivers available or do i nedd to build something myself?

RC cars have motor controllers that run off a servo signal. Most of the ones these days are all solid-state (when I was playing with them 20 years ago, they actually had ones that were built around relays and huge series resistors), and are usually referred to as "Electronic Speed Controllers", or ESCs.

Be aware that there are also ESCs for model airplanes that are usually much cheaper, but don't do reverse.

You should also be suspicious of claims that "This controller will handle 140 bazillion Amps, blahblahblah". I've seen ads that left me thinking their criteria for "works" was "Doesn't immediately set your car on fire when you push it that hard" ;D

Ran

HM, i wanted to circumvent the Speed controller as the one i have is totally illogical and unreliable ;0)
If need be i will switch to a 'speed controller' from one of our 20yr old cars - its a servo that steers a BIG potentialometer ;0)
So noone has any ideas here what to do?

Good 'ol MSC's - manual speed controllers - I remember just a few years ago I used one to add a model rocket to an old rc car - when you hit full speed, the MSC acted as a transistor of sorts and sparked the rocket... good times, good times.

HM, i wanted to circumvent the Speed controller as the one i have is totally illogical and unreliable ;0)

So, get a modern one that is reliable and logical.
At the level of electric motor control, I don't imagine that the laws of physics have changed significantly in the last 20 years.