MOTOR MIND B Capacitors Question

jhoyoza

Hello all,

I'm a new microcontroller hobbyist having extremely good luck with using basic stamps for all kind of experiments, and perhaps I'm going to ask an extremely dumb question?

I ordered a BS2-sx and the enhanced Motor Mind B from Parallax today. http://www.parallax.com/dl/docs/prod/motors/MotorMindbMan.pdf

My question is: What kind of capacitor should I be using? And perhaps someone may be kind enough to explain why I need one at all? The spec sheet calls for a 270uf capacitor at the VMOTOR pin tied to ground (showing 12V source in the example) The only ones I have found (on E-bay) are 270uf 100 volt Aluminum radial lead looking types. And the others are AC Motor Starting Capacitors 270-324 MFD UF 250V and also listed are some Rubycon Capacitors 270uf 450V MXC computer grade?

I have no clue what MXC or computer grade actually means, and the rather large AC motor starting caps seems unlikely for this application. If anyone can help me I would greatly appreciate it. I’m guessing the Aluminum radial type with a proper voltage rating is perhaps my Huckleberry?


Thank You!

-J

Post Edited (jhoyoza) : 10/21/2006 7:34:59 PM GMT

PJAllen

You called?

jhoyoza

I get it...lol


Huckleberry hound...lol

PJAllen

I believe that most any 270uF will suffice.· It's just for stiffening the motor voltage (VMOTOR) a bit.· 25V (25WVDC) should do it (the rating should be at least 2X the motor voltage.)

jhoyoza

Huckleberry Hound may have been the first cartoon ever to receive an Emmy for Outstanding Achievement! You sir, have earned the Hoyoza award for, expertise, friendliness, and a wonderful sense of humor!!

Thank you!