From: nospam@gte.net   
      
   "Charles"  wrote in message   
   news:M4Kdna9FXbY5V3jbnZ2dnUVZ_u-unZ2d@comcast.com...   
   >   
   > "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.   
   >   
   > Double-pole, double-throw switch or relay?   
      
   Of course than would work but I need for the switch to happen automatically   
   when thepower is turned off then back on.   
   >   
   >   
      
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