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Convert 12V DC to 6V DC


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ezrollin 
Copper - Posts: 65
Copper spacespace
Joined: August 22, 2008
Location: Texas, United States
Posted: August 23, 2008 at 7:49 PM / IP Logged  

Convert 12V DC to 6V DC - Page 4 -- posted image.

Would this be a simpler dumbed down version that would work instead?  THANKS!

reax222 
Copper - Posts: 220
Copper spacespace
Joined: March 11, 2006
Location: United States
Posted: August 23, 2008 at 7:56 PM / IP Logged  
megaman wrote:

first of all your diagram shows the voltmeter in series with the circuit.  This means that you have almost no understand of basic electronic principles.  Please do not attempt to build a circuit.  No need to get all huffed up about not knowing basic electronics, I have no idea how to make a cake and that is pretty simple.. so I'm told.

Here's your proper voltage divider diagram which WILL NOT WORK in your scenario as it doesn't supply the necessary current for your application, and for a host of other reasons.

Convert 12V DC to 6V DC - Page 4 -- posted image.

Just for my review. This diagram shows a total amperage of 0.06a. Kirschoff says the voltage across either resistor is 6v.
Now if both resistors were 1ohm and could handle 72 watts you could get 6 amps? If the resistors were 6ohm you could get 1 amp across each resistor?
ezrollin 
Copper - Posts: 65
Copper spacespace
Joined: August 22, 2008
Location: Texas, United States
Posted: August 23, 2008 at 8:33 PM / IP Logged  

Convert 12V DC to 6V DC - Page 4 -- posted image.

Never mind,  I will follow this one!!!!  yeay

ezrollin 
Copper - Posts: 65
Copper spacespace
Joined: August 22, 2008
Location: Texas, United States
Posted: August 24, 2008 at 6:35 PM / IP Logged  
i am an idiot wrote:

I can not find any info to support the 6 volts to trigger the ECU.  Where did you read or hear of that?

Are the wire colors coming from the Ignition switch,  Brown, White, Grey, Blue, Red, White again, and ORANGE / Green?

http://www.zx-6r.com/downloads/wiring_diagrams.shtml

Sorry I didnt reply!

Its called the Logic Supply Voltage to the ECU

yes, there is a brown, white, GREY (  6v  ), blue, red

red and blue are for lights

sorry, my manual is on my other computer.. I will have to whip that out for you!! 

i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 24, 2008 at 6:40 PM / IP Logged  

No need to get the manual for me, As long as you have documentation or heard of it from a reputable source, that is fine.  I just didn't want to help you chase your tail.  

Are you familiar with the GM keys that had the resistor blister at the top end of the key?   Does your key have a similar blister?

ezrollin 
Copper - Posts: 65
Copper spacespace
Joined: August 22, 2008
Location: Texas, United States
Posted: August 24, 2008 at 8:56 PM / IP Logged  
never heard of a resistor blister.  I have a 2002 gm car and I have a resistor in my key... some people call it a "chip".    Its like 18k ohms...  I cant remember where I read that.  Are we talking about the same thing?  My key does not have any form of electrical in it (except for being conductive Convert 12V DC to 6V DC - Page 4 -- posted image. )
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 24, 2008 at 9:04 PM / IP Logged  
Yes the 18K resistor is what I am talking about.  It is not a chip, it's only a resistor.     You did verify that there was only 6 volts on the grey wire coming from the ignition switch?
ezrollin 
Copper - Posts: 65
Copper spacespace
Joined: August 22, 2008
Location: Texas, United States
Posted: August 25, 2008 at 4:14 PM / IP Logged  

I was making fun of people calling it a "chip" sorry

I have not yet metered the 6v input grey wire (or I have and got nothing).

I just heard from a reputable source that its a 6v dc input to the ecu.  (6v output from the key lock cylinder)

What wattage should my resistors be? 

I got my R1 Resistor  to  1315 ohms and my R2 pot is a 5k ohm.  (which should equal 6v)  but gives me a MAX of  4.98V

So instead I go against the math and use   1090 ohms on R1 and 5k on ohm to which should get me ~6.98v  but instead gives me a max of     5.96volts

wierd... wish i had the option to turn it up to around 6.10v

ohh well we'll try this

ezrollin 
Copper - Posts: 65
Copper spacespace
Joined: August 22, 2008
Location: Texas, United States
Posted: August 25, 2008 at 5:05 PM / IP Logged  

Convert 12V DC to 6V DC - Page 4 -- posted image.

Here is my wiring topography.    My resistors are a mix of 1 watt and 1/2 watts - is this okay?

i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: August 25, 2008 at 5:29 PM / IP Logged  
You should only be using 2 connections of the potentiometer.  You are simply using it as a variable resistor.  connect the middle leg of the pot to the negative terminal of the battery.  You should get output from the output terminal of the regulator.  Leave the resistor connected there too.  Just connect another wire there to run to the ignition switch.  The right terminal of the pot should be open.
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