[SEL] My 2 cents worth

[Elden DuRand]

Ed:

Recently, I updated my Magnet Tester page.  The version I built a few years ago uses a 78L05 three terminal voltage regulator to allow a stable supply voltage to the Hall circuit.  I also made a simple circuit to test the battery using the meter on the tester.  Any reading over half scale means the battery is still good.

I wouldn't suggest using a Zener diode as a shunt regulator because they are current hogs and are very temperature sensitive.

Thanks for the part number.  When I get a chance, I'll see if they're still available.

Take care - Elden
http://www.oldengine.org/members/durand 

> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com]On
>  Behalf Of Ed Stoller
> Sent: Friday, February 19, 2010 08:02 PM
> To: The SEL email discussion list
> Subject: Re: [SEL] My 2 cents worth
> 
> 
> I have a calibrated sensor ( A3516LUA) made by  
> Allegro Micro Systems and 
> distributed by Newark, I think I special ordered 
> it. It has been a while; 
> the Calibration table is dated 1997. It is too 
> early to know if I am going 
> to Portland, Ind, but it would be easy to bring.
> 
> I am not satisfied with the 9 Volt battery source 
> as I have to check to see 
> if the battery is going dead. I would like to use 
> a 12 Volt battery and 
> Zener diode to substitute for it.
> 
> Ed Stoller
> New Fairfield, CT
> http://home.earthlink.net/~edstoller/