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the12volt`s installbay - Mobile Electronics Forums the12volt's install bay / General Discussion

Subject Topic: convert 12v dc to 6v dc (Topic Closed Topic Closed)

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i am an idiot
Platinum
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Joined: Septemberá21, 2006
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Posted: Augustá22, 2008 at 10:41 PM - IP Logged  

Is there any way you could use a volt meter and check voltage on every wire of the ignition harness? Ground the black meter lead to ground, turn the key on and read the DC voltage of every wire on the harness. Post them here.
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ezrollin
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Joined: Augustá22, 2008
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Posted: Augustá22, 2008 at 11:15 PM - IP Logged  

I would love to! 

Heres a cheap simple NON-enclosed one on ebay (think it would be sufficient?):

http://cgi./LM317-adjustable-voltage-regulater-prototype-module_W0QQitemZ160272888325QQihZ006QQcategoryZ58278QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Here is the ebay search: 

http://search./search/search.dll?from=R40&_trksid=m37.l1313&satitle=LM317&category0=

I also found one on www.digikey.com  (more expensive kind,  found them through msn search for LM317)

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KPierson
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Posted: Augustá23, 2008 at 11:19 AM - IP Logged  

I would just pick one up at radioshack along with the resistors that you need.

Do you have any idea what this voltage is used for?  Is it only to tell the ECU that the correct key has been inserted (like an immobilizer)?  If you only need it as a reference voltage you should be able to use a pot, but like I said before if you are actually powering circuits you will need a power supply.


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ezrollin
Copper
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Joined: Augustá22, 2008
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Posted: Augustá23, 2008 at 3:04 PM - IP Logged  

KPierson wrote:

I would just pick one up at radioshack along with the resistors that you need.

Do you have any idea what this voltage is used for?  Is it only to tell the ECU that the correct key has been inserted (like an immobilizer)?  If you only need it as a reference voltage you should be able to use a pot, but like I said before if you are actually powering circuits you will need a power supply.

I tried playing around with a potentiometer yesterday but couldnt get any voltage drop.  It was a 5k ohm on a 12v dc batt.  Again,  I'm sure I was doing something wrong (but I've had pots work for me before.. idk whats the problem?)

I bought a LM317 T Positive (adjustable voltage reg) from Radio Shack today.  What resistors would I need?

Stats:

TO-220 Case     Internal current-limiting protection

Vout adjustable +1.2 to 37v   (YEAY!)   

Cout limited to 1.5A

Absolute Maximum ratings:

Power dissipation:   15W

Input-Output voltage differential:   40V  ????  whatever happened to +1.2 to 37V?  Shouldnt it be 35.8V difference?

Load regulation (typ.):  0.1% / V

Fine regulation (typ.) 0.01% / V

Ripple rejection (typ.):  80dB

all ratings assume proper heatsinking

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KPierson
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Posted: Augustá23, 2008 at 3:21 PM - IP Logged  

Do a google search for LM317 calculator, there are several sites out there with working calculators.

To use a pot as an adj voltage device you need to apply power to one outside pin, apply ground to the other outside pin, and use the middle pin (the wiper) as your voltage output.  If you try to use only two pins you won't get any voltage drop.

The 1.2v - 37v spec is the OUTPUT.  The input-output differential of 40vdc says that your INPUT voltage must be within 40vdc of the output voltage - for example if you want 6vdc out your input voltage must be below 46vdc.


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ezrollin
Copper
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Joined: Augustá22, 2008
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Posted: Augustá23, 2008 at 3:46 PM - IP Logged  

you guys are the shiznit!!

Thanks ALOT!!!!

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ezrollin
Copper
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Joined: Augustá22, 2008
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Posted: Augustá23, 2008 at 6:42 PM - IP Logged  

So I dont need or Have to have any capacitors at all, correct? 

Yes, my bike's ECU needs a ~6V DC refrence voltage!

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ezrollin
Copper
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Posted: Augustá23, 2008 at 6:56 PM - IP Logged  

I'm just confused where it says C2 they have it set as 240 ohms with a capacitor.... Is this where my Resistor1 goes or should I put my Resistor1 where I marked it as R1??????

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ezrollin
Copper
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Posted: Augustá23, 2008 at 7:15 PM - IP Logged  

I see where the input goes now.   duh!!! sorry

It says on R2 that it needs a variable resistor (symbol)  does it really mean a Pot?

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i am an idiot
Platinum
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Joined: Septemberá21, 2006
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Posted: Augustá23, 2008 at 7:24 PM - IP Logged  

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

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