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Offline daveraveTopic starter
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« on: April 24, 2016, 04:28:42 pm »
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anyone got any speake magnometers for sale and also the circuit board to use two sensors.

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Offline GoldDigger1950
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« Reply #1 on: April 24, 2016, 06:20:58 pm »
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What are Speake magnatometers? Is that a brand name?

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #2 on: April 25, 2016, 01:24:19 am »
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Speake is a UK brand name for a certain type of magnometer sensor.

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« Reply #3 on: April 25, 2016, 03:10:29 am »
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Thank you.

Now that we have that established, what part number are you looking for?

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #4 on: April 25, 2016, 07:13:11 am »
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This what your on about ?    FGM-series - Speake Sensors

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www.speakesensors.com/PDF/detail.pdf

The FGM-X series of devices are very high sensitivity magnetic field sensors ... typical period swing for the full range of an FGM-3 is from 8.5 Ás to 25 Ás (~120 ...

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« Reply #5 on: April 25, 2016, 08:01:46 am »
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im after a couple of second hand FGM-3 sensors...and also the circuit as designed by Carl Morland.

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« Reply #6 on: April 25, 2016, 12:27:21 pm »
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   Farrite Rod with a few hundred winds of #32 AWG wire fed into a Op Amp in differential Mode does the job.

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