Polarity Reverser

[Bill]

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

 

[Skenny]

Bill wrote:

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


What is the max current draw on this?

 

[Charles]

"Bill" <nospam@gte.net> 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?

 

[Tim Dunne]

"Bill" <nospam@gte.net> 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.

Impulse relay.
http://www.schneider.co.uk/internet/pws/pws.nsf/contents/AEA4E7C6925CC77D802571080051887C?open

HTH

Tim
--
Sent from Birmingham, UK... Check out www.nervouscyclist.org
'I find sometimes it’s easy to be myself, but sometimes I find it’s
better to be somebody else.' - Dave Matthews 'So Much To Say'
My 'reply to' address is valid, mail to the posting address is dumped

 

[Bill]

"Skenny" <Skenny@highstream.invalid> wrote in message
news:fc2ho5$eeb$1@news.albasani.net...

Bill wrote:
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


What is the max current draw on this?

Doesn't make a difference because I need the auto switcher first, then I can
be concerned about the current drive requirements.

 

[Bill]

"Charles" <charlesschuler@comcast.net> wrote in message
news:M4Kdna9FXbY5V3jbnZ2dnUVZ_u-unZ2d@comcast.com...

"Bill" <nospam@gte.net> 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.

 

[Bill]

"Tim Dunne" <Bit_Bucket@Blueyonder.co.uk> wrote in message
news:CVkFi.12317$c_1.2470@text.news.blueyonder.co.uk...

"Bill" <nospam@gte.net> 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.

Impulse relay.

http://www.schneider.co.uk/internet/pws/pws.nsf/contents/AEA4E7C6925CC77D802571080051887C?open

HTH

Tim
--
Sent from Birmingham, UK... Check out www.nervouscyclist.org
'I find sometimes it's easy to be myself, but sometimes I find it's
better to be somebody else.' - Dave Matthews 'So Much To Say'
My 'reply to' address is valid, mail to the posting address is dumped

Sounds interesting Tim. I will check it out and let you know. Thanks.
Bill

 

[Bill]

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" <nospam@gte.net> 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

 

[Bill]

I need a circuit to automatically change output from a high to low, every
time I remove power. How about like a 555 chip or some flip/flop that gives
you a high output when triggered when you first apply power? After you shut
the system off and turn it back on the output is low. Next time power off
then when back on, the output of the chip is high.
IOW alternate highs & lows each time the system is turn on. I hope that this
is a better explanation gents.

Bill