Dan Michaels wrote:

<<<< Hmmm, from the description of your problem, it sounded like you could
 possibly have had the source and drain terminals reversed on the upper
 p-channel devices.
 ==========>>>>

I was sure that wasn't the problem. I checked and rechecked and threatened it
many times, and all the FETs were hooked up correctly. With the P-Mosfets
switching the N-Mosfets, it was giving me trouble. When I switch each Mosfet
from its own transistor (to 6v - 12v) it works great. Maybe to have the P's
switch the N's you have to use complementary Mosfets? Either way, it works
with the new setup.

<<<<  .......
  Some of the
 >pages I've read concerning H-bridges have said that you should use the
 >supression diodes when switching with transistors, but that many MOSFET's
 >have the diodes built in and external ones are unnecessary. Should I go
ahead
 >and drop some of these in, at least to play it safe?
 >

 This was discussed just last month on piclist - take a look at the
 following thread:

 [EE]: IRL540 MOSFET Question
 http://www.infosite.com/~jkeyzer/piclist/2001/Jul/1392.html

 - dan >>>>


Maybe if I wasn't so ignorant sometimes I would have seen it then! Thanks for
directing me.

-Tony

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