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(EMF) Electromagnetic field detector

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Guest nanop

Hi!
I'm planning to build the following circuit and
I have some questions about the following project:
http://www.electronics-lab.com/projects/science/006/index.html

Since the LF351 is no longer available, can I use the TL07x series, TL071, TL082, or possibly a LM741, or LM386?

What kind of meter and range do I use?
Or possibly skip this and just use the earphone?

The last one is, what are the pin connections?
THe schematic doesn't show the pin #'s.

thanks very much!!

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Since the LF351 is no longer available, can I use the TL07x series, TL071, TL082, or possibly a LM741, or LM386?

It is such a simple circuit that it will work with any opamp. An LM386 is a power amplifier with a pre-determined gain, not an opamp, and the circuit won't have enough gain with it.

What kind of meter and range do I use?

The project doesn't say anything about the meter. It is driven by the 10k resistor with a few volts, so a 200uA meter will work.

Or possibly skip this and just use the earphone?

What do you expect to hear? Lots of mains hum.

The last one is, what are the pin connections?
THe schematic doesn't show the pin #'s.

Look on the datasheet for the opamp.

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  " Are you a ghost hunter? Then this is the circuit that you've been waiting for! Since it has been observed that appearance of a ghost tends to disturb the EMF, you can now detect any such changes with this little detector."

I think we are hunting ghosts with this meter

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