From: nospam@gte.net   
      
   I don't think I explained myself that well. Let me try again.   
      
   You have a simple 12V supply. The red post is +12V and the black post is 0v   
   (isolated ground). When I turn the power supply off and after I turn it back   
   on ... I want the red post to be 0V and the black to be +12V.   
   Bill   
      
   "Bill"  wrote in message news:912Fi.421$1n1.360@trnddc02...   
   > Anyone know of a way to reverse polarity (9 to 12V DC)  each time the   
   power   
   > is removed? In this gadget I have there is a small 12V supply. When I turn   
   > the gadget off and then turn it back on, I wish to have the 12V reverse   
   > polarities. For another example, I have a black box with 2 posts, the top   
   > post is +12v and the bottom post is 0v. I turn the power off and the next   
   > time I turn the power on, I would like the top post to be 0v & the bottom   
   > post to be +12v. Is there like a simple flip flop chip or ?? than can   
   > accomplish this task? All comments most appreciated. Thanks in advance.   
   >   
   > Bill   
      
      
   >   
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