best way to convert positive to negative?

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rodriik

Member - Posts: 12

Joined: July 31, 2009

Posted: August 06, 2009 at 9:25 PM / IP Logged

What is the best/simplest way to invert from + to -?

i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: August 06, 2009 at 9:27 PM / IP Logged

Convert a Positive Output to a Negative Output

If you have a switch or an alarm or keyless entry that has a positive output that you wish to use to switch a device that requires a ground such as a horn, dome light, parking lights, head lights, hatch release, etc., wire a relay as shown below to convert the positive output (trigger) to a negative output. best way to convert positive to negative? - Last Post -- posted image.

best way to convert positive to negative? - Last Post -- posted image.

Here's the same configuration showing a positive output from an alarm or remote keyless entry used to activate a vehicle's parking light relay that requires a ground to turn the lights on. best way to convert positive to negative? - Last Post -- posted image.

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

rodriik

Member - Posts: 12

Joined: July 31, 2009

Posted: August 06, 2009 at 11:34 PM / IP Logged

Thanks. What's the best way to do it without a relay? This is in the cab and I don't want the clicking noise.

racing_bidule

Copper - Posts: 66

Joined: December 13, 2007

Location: Quebec, Canada

Posted: August 07, 2009 at 12:51 AM / IP Logged

rodriik wrote:

What is the best/simplest way to invert from + to -?

GET A WIFE!

LOL

If you fail on your first attempt, at least destroy all evidence you tried!

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: August 07, 2009 at 3:56 AM / IP Logged

That last post was a classic, second, Mr. Idiot "ex master installer" what's the way to do it using transistors please, ie pos to neg and vice versa? Email me if you can't post it here.

i am an idiot

Platinum - Posts: 13,667

Joined: September 21, 2006

Location: Louisiana, United States

Posted: August 07, 2009 at 8:00 PM / IP Logged

Howie, the things that you remember me posting were simple current amplifying devices. They are used for bluetooth modules that do not have enough current capacity to trigger a relay. Also used in some newer databus cars. There is sometimes not enough current to get an ignition source. If you connect a relay to the wire at the ignition switch, it freaks the car out. I do not know of a simple way to convert polarity with a transistor. I will make a call and see what I can find out for you.

Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

OmarR

Copper - Posts: 162

Joined: April 02, 2003

Location: Indiana, United States

Posted: August 09, 2009 at 10:36 PM / IP Logged

Wouldn't it be easier to just mount the relay in the engine compartment and run the output wire into the cab?

darksidecelica

Member - Posts: 30

Joined: July 21, 2009

Location: California, United States

Posted: August 10, 2009 at 8:31 PM / IP Logged

Hmm. I thought only relays can convert a + to a -.

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best way to convert positive to negative?

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