piclist 2008\07\26\235728a >
Thread: Low Noise, High Gain Amplifier
face picon face BY : Sean Breheny email (remove spam text)

Hi Fred,

What kind of magnetometer are you considering? I'm not aware of any of
them which indicate field strength by changing the output frequency of
a sinusoid. Did I understand you correctly?


On Sat, Jul 26, 2008 at 10:32 PM, fred jones <boattowspamspamhotmail.com> wrote:
> Thanks for the responses, I was out all day and just got back in town.  Strange thing is I see I had at least 3 responses however this is the only one I actually received.  Luckily it has several responses still attached.  I wonder how many responses I didn't receive that also didn't make it here. I'm hoping to build a magnetometer.  This would be used primarily in the woods or wilderness.  Roughly one hertz to the next equals something like 25nT field strength (I have a formula that can be fairly easily implemented in the PIC code to calcualte this).  Therefore it is imperative that it be extremely stable and noise free.  A slight amount of jitter would give innacurate data.  I know this is possible because there are commercial units out there that yield .1nT accuracy, I'm just not experienced in this area.  I will try the suggestions here and see how successful I am.  I appreciate all the help you all have offered!Best wishes,FJ> From: KILLspampetertwitchspamKILLspamhotmail.com> To: piclist
>  mit.edu> CC: boattowspamspamKILLspamhotmail.com> Date: Sat, 26 Jul 2008 16:49:59 +0000> Subject: [EE] Low Noise, High Gain Amplifier> > What about a single hi-gain op-amp feeding a band-pass filter with a high Q inductance... Feed the output to a 555 timer arranged as a monostable, period set to half the period of the slowest frequency. That'll give you your sqw output thats pretty much frequency & phase-locked, & fairly noise-immune...> P> > {Original Message removed}
<e726f69f0807262057y20c0b5d5xe8e8493eef86c9b4@mail.gmail.com> 7bit

In reply to: <BLU149-W29878D7E50D476668C87ECBB800@phx.gbl>
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