"the power unit 12v Nimh work only for motors and I will use an other unit ( 7,2v as I have) for my receiver"
No! I wrote at the top of my drawing "Exactly like this" and that is exactly what I meant.
You need only the 12v battery. You don't need another one for the receiver. I'm sorry because I believe that English is not your first language, but where I have written NO CONNECTION then there is NO CONNECTION. NOT 7.2v. NOT 5v. No Connection. Nothing in that socket. Rien. Niente. Nenhuma coisa. How can I make it any clearer?
At the risk of boring both myself and anyone else reading this to a complete standstill, the power for the receiver comes from the 12v battery via the speed controller, where it is reduced to 5v and sent down the three thin wires to Socket #2. If you connect any other battery into the Battery socket on the receiver then you will blow it up. Dead. Morto. Muerto. Mort.
Giving advice is what we're here for, but when we take the trouble to offer you some then would you please read it carefully before replying? I think we'll leave your Fletcher Class for another time; my blood pressure may not be up to it just now.
Dave M
Edited By Dave Milbourn on 15/01/2016 17:24:43
Edited By Dave Milbourn on 15/01/2016 17:25:15