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Re: Electrical guru's!
[Re: moparmat]
#811933
09/22/10 10:40 PM
09/22/10 10:40 PM
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Joined: Jan 2003
Posts: 3,078
Edmonton, Alberta, Canada
Dartman75
master
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master
Joined: Jan 2003
Posts: 3,078
Edmonton, Alberta, Canada
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Speaking as a computer engineer I say "Huh"  What are you trying to use this voltage output for? Are you trying to drive teh brighness or actually drive the tach needle in some fashion? Now there are ways to read RPM, and way to generate analog voltage based on them. Knowing what the heck you're up to will help me give you the best advice I can. Greg
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Re: Electrical guru's!
[Re: moparmat]
#811935
09/22/10 11:33 PM
09/22/10 11:33 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Your best bet would be to use the tach signal to drive a frequency to voltage converter, otherwise you are out of luck.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: Electrical guru's!
[Re: Supercuda]
#811936
09/22/10 11:38 PM
09/22/10 11:38 PM
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Joined: Jun 2009
Posts: 90
Canada
moparmat
OP
member
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OP
member
Joined: Jun 2009
Posts: 90
Canada
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Supercuda, please elaborate.  Where do I find a frequencey to voltage converter, what kind should I be looking for? Please excuse my ignorance. Thanks! 
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Re: Electrical guru's!
[Re: moparmat]
#811939
09/23/10 01:08 AM
09/23/10 01:08 AM
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Joined: Oct 2007
Posts: 3,884
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,884
Oregon
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I would find a MAP sensor (Freescale makes a bunch, and the Ford 5.0l system used one), and plumb it into the intake. That will give you voltage output corresponding to the load.
Then you can condition that signal as necessary and run it into your pump controller.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Electrical guru's!
[Re: None2Slow]
#811941
09/23/10 02:08 AM
09/23/10 02:08 AM
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Joined: Jun 2009
Posts: 90
Canada
moparmat
OP
member
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OP
member
Joined: Jun 2009
Posts: 90
Canada
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Quote:
Could you add and modify a TPS to do this function? Or am I totally off base? 
TPS???
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Re: Electrical guru's!
[Re: moparmat]
#811942
09/23/10 03:00 AM
09/23/10 03:00 AM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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You could add a MAP or Throttle Position Sensor to the engine/throttle which may be easier if that is what your module is expecting. You could also take the tach signal as an input to a linear integrator circuit (Look up OpAmp theory.) Hope this link works: http://www.wisc-online.com/objects/ViewObject.aspx?ID=SSE5303That would be a basic starting block. You would want to filter the output and maybe clamp the maximum output voltage depending on how sensitive the module you are connecting it to?
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Re: Electrical guru's!
[Re: moparmat]
#811943
09/23/10 07:01 AM
09/23/10 07:01 AM
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Joined: Mar 2010
Posts: 357
Lake Elmo, MN
Evil Monkey
enthusiast
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enthusiast
Joined: Mar 2010
Posts: 357
Lake Elmo, MN
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Quote:
Ok, here goes.
I have a motor speed control module that I would like to use to power a 12v electric motor such as a moroso electric water pump drive kit would have.
Basically, it's a device that steplessly varies the voltage going to a 12V load. By turning a trimpot you can vary the speed of an electric fan, fuel pump or electric water pump.
Is it critical that the speed of the electric motor be controlled precisely by the RPM's, or are you just looking control that's "in the ballpark"?
If it's ballpark control, you could simply rig something up so that the trimpot you mention is turned based on your accelerator position. Generally speaking, the further you press the accelerator petal, the higher your RPM's will be. There is lag when you first press the petal, and your RPM's will not correspond to the petal position when going up or down hills, accelerating, decelerating, etc. But, petal position is dictating how much fuel and air is going into the engine, so it may be a better measure of how much cooling or fuel you need.
I'm guessing that it would be much easier to rig up a bracket and some mechanical connections so that your trimpot is controlled by accelerator position (at either the petal or the carb), rather than engineering and building an electrical circuit that would vary the voltage based on engine RPM. But, if you are looking for something more precise, this wouldn't work, and you would need to engineer a circuit.
If you do go this route, though, make sure that the trimpot would not be able to cause your accelerator to stick - there's been enough of that lately. Creating a "one way" mechanical connection to the trimpot, so that you only move the trimpot by pressing the accelerator down, and then have the trimpot moved back with a return spring (instead of having the accelerator mechanically move it back) would do the trick. That way, if the trimpot freezes, the accelerator will still return to idle.
1974 'Cuda 360/TKO
1990 Ram Van
1998 Neon
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Re: Electrical guru's!
[Re: Evil Monkey]
#811944
09/23/10 09:16 AM
09/23/10 09:16 AM
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Joined: Dec 2006
Posts: 388
Southington, Ohio
dm69charger
enthusiast
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enthusiast
Joined: Dec 2006
Posts: 388
Southington, Ohio
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Quote:
Quote:
Ok, here goes.
I have a motor speed control module that I would like to use to power a 12v electric motor such as a moroso electric water pump drive kit would have.
Basically, it's a device that steplessly varies the voltage going to a 12V load. By turning a trimpot you can vary the speed of an electric fan, fuel pump or electric water pump.
Is it critical that the speed of the electric motor be controlled precisely by the RPM's, or are you just looking control that's "in the ballpark"?
If it's ballpark control, you could simply rig something up so that the trimpot you mention is turned based on your accelerator position. Generally speaking, the further you press the accelerator petal, the higher your RPM's will be. There is lag when you first press the petal, and your RPM's will not correspond to the petal position when going up or down hills, accelerating, decelerating, etc. But, petal position is dictating how much fuel and air is going into the engine, so it may be a better measure of how much cooling or fuel you need.
I'm guessing that it would be much easier to rig up a bracket and some mechanical connections so that your trimpot is controlled by accelerator position (at either the petal or the carb), rather than engineering and building an electrical circuit that would vary the voltage based on engine RPM. But, if you are looking for something more precise, this wouldn't work, and you would need to engineer a circuit.
If you do go this route, though, make sure that the trimpot would not be able to cause your accelerator to stick - there's been enough of that lately. Creating a "one way" mechanical connection to the trimpot, so that you only move the trimpot by pressing the accelerator down, and then have the trimpot moved back with a return spring (instead of having the accelerator mechanically move it back) would do the trick. That way, if the trimpot freezes, the accelerator will still return to idle.
 This is what I would do!!! 
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