Homebrew PCBs

On Mon, 20 Jun 2005 14:59:04 +0200, Robert Hedan  
<robert.hedan@...> wrote:

>
> I've added opto-couplers between the CMOS chips and the transistors,  
> lowered
> the CMOS voltage down to 5 volts and increased the motor voltage to 24  
> volts
> (which is what my motors are rated).


24V motors? they are going to have a lot of inductance and resistance.

Probably OK for simple drivers, but if you ever plan to use chopper  
drivers you are looking for low voltage low ohms motors.


(The idea is to drive like a 3V motor with 30V, to quickly increase the  
current in the motor to the level you want, and then reduce the drive  
voltage. For speed.)

ST