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#1 MH81 ONLINE  

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Posted February 22, 2011 - 10:02 PM

I didn't know where to ask, so here goes...

I have been looking into using Hall Effect Sensors as a flywheel position sensor, to drive a transistor, then drive a coil. Does anyone have first hand experience with these? I was also looking at ways to use reluctor sensors (what they use in distributors with the little star)

Looking for input, advise, & guidance. Thanks in advance.

#2 Texas Deere and Horse OFFLINE  

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Posted February 22, 2011 - 10:25 PM

Alan, If I only knew what you were talking about, maybe I could help. LOL:confuse:

#3 MH81 ONLINE  

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Posted February 22, 2011 - 10:29 PM

Alan, If I only knew what you were talking about, maybe I could help. LOL:confuse:


You are assuming I do. :rofl2:

#4 Texas Deere and Horse OFFLINE  

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Posted February 22, 2011 - 10:34 PM

ok, you got me ...:madhop::bigrofl:

#5 coldone OFFLINE  

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Posted February 22, 2011 - 10:55 PM

Take a look at this
YouTube - sixtysymbols

Probably not what you want to know but very neat series of videos call "sixty symbols"

I know a small amount about Hall effects. What are you looking for?
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#6 MH81 ONLINE  

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Posted February 22, 2011 - 11:06 PM

What are you looking for?


If a hall effect was placed inside a single magnet flywheel, could it be used to trigger a PNP or NPN to drive a coil to generate a spark? I am even thinking about 2 sensors, 17 degrees apart (early one for starting). The early one could even be powered only when the starter gets juice... then it would shut down as you release the key.

#7 Texas Deere and Horse OFFLINE  

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Posted February 22, 2011 - 11:13 PM

Alan if you use a 2 post starter solenoid, you can pickup power off the second terminal for starting circuit
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#8 coldone OFFLINE  

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Posted February 23, 2011 - 07:46 AM

If a hall effect was placed inside a single magnet flywheel, could it be used to trigger a PNP or NPN to drive a coil to generate a spark?


Firstly I am not an engineer, I believe you can. I think it could be done a few different ways as long as the Hall effect sensor can drive the transistor. I think wiring the circuit with the positive voltage coming thruogh the coil and stopping at teh collector of the transistor. Then using the Hall effects sensor to trigger the base of teh transistor. That should allow yoyr negative voltage to come through the transistor and complete the ciruit for the coil.

You will just have to ensure that hall effect can provide the 0.7 VDC needed to trigger the transistor.

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  • trigger circuit.jpg

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#9 MH81 ONLINE  

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Posted February 23, 2011 - 08:04 AM

I suppose we could also switch the + side of the coil, then all that one would need is a dropping resistor & a zener diode to set up a +5 on the input to the hall effect?
Wow, it's been a long time since I've played with any of this.

#10 Alc ONLINE  

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Posted February 23, 2011 - 08:43 AM

I never did anything like what your doing but thought about trying one of these kits , has anyone used them ? Al
Universal Ignition Module

#11 DougT OFFLINE  

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Posted February 23, 2011 - 10:08 AM

Ed Stoller has designed an ignition system that I believe uses a hall effect. I know there are guys running hit and miss engines on it. Take a look at his website. www.enginesandmagnets.com

#12 DougT OFFLINE  

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Posted February 23, 2011 - 10:10 AM

I never did anything like what your doing but thought about trying one of these kits , has anyone used them ? Al
Universal Ignition Module


I've used these ignition modules. They don't work on eveery engine but they work on the majority. They're nice for those show machines that only get run once in a while. Sure beats having to clean the points every time you take it out!

#13 Alc ONLINE  

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Posted February 23, 2011 - 11:43 AM

Thanks Doug for the info , so your saying they wouldn't be good for every day use ? Al

#14 coldone OFFLINE  

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Posted February 23, 2011 - 12:36 PM

I suppose we could also switch the + side of the coil, then all that one would need is a dropping resistor & a zener diode to set up a +5 on the input to the hall effect?
Wow, it's been a long time since I've played with any of this.


Me too.
I was always taught that it was better to sink current with transitor than to source it. Thats why i put it on the negative side of the coil.

#15 DougT OFFLINE  

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Posted February 23, 2011 - 01:24 PM

Thanks Doug for the info , so your saying they wouldn't be good for every day use ? Al


I didn't mean it to come out that way. I'd think they would be alright. There just isn't much modern stuff that doesn't already use electronic and I've never tried to replace a factory trigger with one. If I had an everyday user that needed the points replaced I'd use the module. I had one in an old chainsaw that saw a lot of use and never had a problem.
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