Powering 4 motors from 1 ms ffb controller card, double power mod enough?

[trigen]

Thinking about powering 2 FFB's from one card and im wondering a bit about any voltage drops and such, would you also need double amps? Greater PSU?

 

I got double current with added resistors on it now, would that be sufficient to handle both?

[Braeden108]

I'm only a beginner when it comes to electronics, but I'm pretty sure how the FFB generates the force. They probably generate a 5 volt analog signal which would go to the gate of a transistor. Changes from 0-5 volts on the gate would produce proportional changes on the drain (or source I get them confused.) So my thought is, you can build a breakout board with my guess is 4 transistors on it. You can then use any rating of transistor you want and use as big of a power supply as you'd like. And there are probably 4 because, I'm thinking there are 2 for the forwards and backwards, and then 2 motors, 4 transistors.

 

If were you I'd look up the number on the four components near where the motor wires come in. I'm looking at a low res picture of the board, but I can see where the traces go and there's some hefty traces going to those components. Then you can determine what those are and perhaps figure out their ratings, or use it to find some bigger ones to use.

Edited January 7, 2017 by Braeden108