Hi,
First ...
Your diode parallelled to the mosfet must be paralleled to the MOTOR ... that will GREATLY limit the spikes ( 1N400x seems a bit Weak for this kind of motor ... try better 1N540x or a fast recovery TO220 model )
Now,
1) place a low ESR 1000µF or + capacitor as close as possible to the motor ... to lower the 12v power source impedance. ( by the way, I'm saying the mosfet could be placed close to the motor ...and the diode between motor terminals ...)
2) place a .1µF on your motor terminals
3) place a 10nF between each motor terminal and motor frame which has to be connected to circuit ground.
4) you can place a core coil ( 1mH range "big value" ) in series beetween 12 v and your 5v reg input
Alain
Last edited by Acetronics2; - 17th October 2007 at 09:01.
************************************************** ***********************
Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
************************************************** ***********************
IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
*****************************************
Bookmarks