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Part Number: INA126
Hi, I'm trying to build an EMF detector which can detect very low levels of EMF.
I have a coil which outputs approx 0.2V AC when subjected to very high levels of EMF from a demagnetiser (50Hz?). But I want to amplify the coil's output so that I can easily detect very low levels of EMF with it.
I am using an instrumentation amplification IC (INA126PA) to amplify the 0.2V AC signal and an AC voltmeter to measure the output. I want this to be about 100V AC, but at the moment I am getting OV, with or without a 100 ohm external resistor (RG)
I have included a circuit diagram below. The circuit is currently on a breadboard. My 3V supply is from 2 x 1.5V batteries.
I'm sure I have done something really silly. Can anyone please tell me (simply) what it is?
In reply to Peter Iliya:
In reply to Alan Morris:
Yes you should be allowed to attach a file or insert an image. Completely up to you.
Use should be able to insert files/media or attachments. Did you click the "Use rich formatting" link at the bottom right of your reply screen? This brings up all of the editing features to your replies.
I am now using Rich Formatting and have tried sending you the two diagrams by "Paste from Word" which worked before (ctrl C, ctrl V) and then by "Insert File" (as a jpg), but neither appear to be working. I have checked that my PC is working OK, by copying and pasting into a blank page and had no problem. Maybe I could send them attached to an email, or send them by post or start a new thread??
Please see below, my circuit diagram which is for an EMF detector employing an INA126PA instrumentation amplifier. I've tried it and it works quite well, but after some testing, I now realise that it needs to be more senistive to low A/C voltages in order to get the EMF sensitivity I need.
Using this circuit I am getting a couple of volts A/C from a very small induced A/C input, which unfortunately I can't measure as my multimeter doesn't go down that low, but since I am using a 10 ohm resister for Rg and getting 1v A/C meter reading in my test, I must assume that the input signal is around 0.1mV. However, this equates to about 1milligauss, and I am looking for readings down to 0.01milligauss, so I really need to multiply the sensitivity by 100.
I wondered if it is possible to get this degree of amplification using 2 x INA126PA instrumentation amps in series? Or would you recommend a different approach, e.g a different TI amplifier?
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