go_away

Author Topic: MOSFETs instead of relays?  (Read 1679 times)

0 Members and 1 Guest are viewing this topic.

Offline TrumpkinTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,177
  • Helpful? 5
MOSFETs instead of relays?
« on: February 10, 2009, 10:32:12 AM »
In the "Build Your Own Butler Robot" tutorial couldn't you use Power MOSFETs instead of relays? It seems like MOSFETs would be a lot smaller and cheaper than relays.
Logged
Robots are awesome!

Offline MaltiK

  • Robot Overlord
  • ****
  • Posts: 300
  • Helpful? 2
Re: MOSFETs instead of relays?
« Reply #1 on: February 10, 2009, 02:26:10 PM »
MOSFETS capable of driving the motors he used were, as he mentioned, beyond his budget.

Also I dont know if you can connect MOSFETS directly to the output of the phidgets like what he did with the relays, I am not sure but I think you need a middleman, an MCU.
« Last Edit: February 10, 2009, 02:38:47 PM by MaltiK »
Logged
Warranty

Offline TrumpkinTopic starter

  • Supreme Robot
  • *****
  • Posts: 1,177
  • Helpful? 5
Re: MOSFETs instead of relays?
« Reply #2 on: February 10, 2009, 02:37:59 PM »
Logged
Robots are awesome!

Offline MaltiK

  • Robot Overlord
  • ****
  • Posts: 300
  • Helpful? 2
Re: MOSFETs instead of relays?
« Reply #3 on: February 10, 2009, 02:41:25 PM »
I always found it wierd that due to the small size of MOSFETs, it would be really hard for me atleast, to accept the fact that they can power motors with as high a current stall as 25amps...
Logged
Warranty
 

Get Your Ad Here