Was: [SEL] Is't true? Now something to look at

[bill at antique-engines.com]

Ed, I suspect they are called "hall effect transistors" as that is how
they are generally used - as magnetic solid state switches, and since that
is all a transistor is in essence, the term "hall effect transistor".
True, the hall effect part is really a solid state sensor.
The most common application consists of of a Hall effect sensor, one or
more logic gates and a transistor used to switch the electric current.
So it's a solid state device that typically comes in a package with a
transistor and the whole thing acts like a transistor with the exception
that the "control" is magnetic field applied rather than a switching
voltage applied.
A common application is the digital Hall effect sensors - often used as
magnetically controlled switches - they turn on or off when the applied
magnetic field reaches a certain level. Hmmm, I see an application
here....

Bill

> Steve,
> The " Hall Effect transistor " is not a transistor. It  is a Hall Effect
> sensor in an integrated circuit, hopefully a Hall Effect switch. It
> probably
> looks like a transistor. I am thinking about using one to trigger a
> Capacitance Discharge Ignition for my Stover CT2 until I can get the right
> magneto.
>
> Ed Stoller
> New Fairfield, CT
>
>
> ----- Original Message -----
> From: "Steve Gray" <segray at mlode.com>
> To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
> Sent: Monday, December 13, 2004 2:20 AM
> Subject: Re: Was: [SEL] Is't true? Now something to look at
>
>
>> Hi All -
>>
>>    Thanks to all for the comments!
>>
>> To Ron - To answer your questions about the Mery's ignition; yes, I am
>> also using the Hall Effect transistor along with the solid state "buzz
>> coil" driver and model high tension coil. This was the thing that
>> probably gave me the most fits, and I ended up going back to my old
>> career and oscilloscope, and redesigning some of the circuit. I really
>> like the idea of the "pointless" ignition and the Hall transistor worked
>> out great. The main problem was two fold: lack of dwell angle and the
>> oscillator circuit not performing as advertised. In a nut shell, I
>> nearly tripled the circuit's frequency while still trying to stay within
>> the saturation specs of the coil. Doing this overcame the lack of dwell
>> (on time) and literally was the difference between the engine running
>> and not running. As for cooling, I'm doing nearly the same as you are.
>> The little brass belt driven pump shown in the pictures is what I
>> dreamed up to circulate the water from a custom 'tank'. The tin covered
>> 'tool box' next to the engine contains the propane tank, regulator,
>> valve and a battery switch for the ignition. The tank, box and engine
>> platform will eventually bolt to an oak top with concealed wheels,
>> handle and legs for moving and showing.
>>
>> To Marv - This is Mery # 223. I recently asked Roland Morrison, the
>> kits' engineer, about how many of these he knows are running. He says
>> he's aware of about 20 throughout the world that actually run now. I
>> just recently coaxed the first person in Japan to buy a kit.
>>
>> To Judge Tommy - Having never gone to school for machining, I consider
>> myself darn lucky to be able to do as well as I do. Thing with this
>> stuff, you're ALWAYS learning!
>>
>> Again, thanks to all!
>>
>> - Steve
>>
>> --
>> Steve Gray
>> Member EDGE & TA, Br. 49 & 13
>> Sonora, California USA
>> e-mail:   segray at mlode.com
>> Home page:   http://www.oldengineshed.com
>>
>>
>>
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>
>
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