"Herman" wrote in message
. ..
"James" wrote in message
...
DPDT switch with center off. Easy
"Bill" wrote in message
news:A%1Fi.420$1n1.105@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





As doctor Phil would say, see if this works for you. Attached schematic.

Sorry, my computer does not open up attachments from email or newsgroups.
Can you send it direct or perhaps reference it on a link?

west