Operating Voltage Selection

[Daves]

Hi
In the detector;
-TX Driving
-Analog Demodulator
-Opamps
etc. What should be the most appropriate voltage choice?
Do you recommend using offset?
Do you recommend using midpoint?
Is it better to use with minus and plus voltages?

[Carl-NC]

I've done it a bunch of different ways with different voltages. For mundane stuff I run +5V only with a rail splitter, but I've designed a PI detector where everything (including the TX) runs on 3V. For high performance designs, I prefer to use a true ground system with +/- supplies. "It all depends."

[ivconic]

I've done it a bunch of different ways with different voltages. For mundane stuff I run +5V only with a rail splitter, but I've designed a PI detector where everything (including the TX) runs on 3V. For high performance designs, I prefer to use a true ground system with +/- supplies. "It all depends."

If it's the one I have; works splendid!

[Daves]

I've done it a bunch of different ways with different voltages. For mundane stuff I run +5V only with a rail splitter, but I've designed a PI detector where everything (including the TX) runs on 3V. For high performance designs, I prefer to use a true ground system with +/- supplies. "It all depends."

What do you think are the pros and cons of working with offset and midpoint?

[Carl-NC]

The biggest difference is how you connect to, say, an ADC or the coil in a mono-PI system. That depends on the ADC you use, and the way you design the PI TX. Clock voltages also need to be considered. It's really a whole-system design issue.

[Daves]

The biggest difference is how you connect to, say, an ADC or the coil in a mono-PI system. That depends on the ADC you use, and the way you design the PI TX. Clock voltages also need to be considered. It's really a whole-system design issue.

Do you have anything to suggest about the difference between direct sampling and analog demodulator methods?
and note: How much current do you think it should draw in an example TX drive? Is one of the main factors affecting depth the effect of TX on the object and the formation of the desired signal?

[Carl-NC]

Direct sampling, baseband sampling, and all-analog receivers are hugely different. My recommendation is start with all-analog and learn the basics; then baseband sampling and learn baseband DSP; the direct sampling last.

I don't know what example TX drive you're talking about. VLF? PI? Many TX circuits recycle energy so what you really want to focus on is the peak coil current and number of turns in the TX winding. So-called "ampere-turns."

[ivconic]

"Broadband" questions all over the place!
Carl make sure you have a pot of coffie prepared next to you!
...
But no matter how funny; Daves is asking indeed good quesions from which answers the majority will benefit.
Good guideline for the book!

[Daves]

"Broadband" questions all over the place!
Carl make sure you have a pot of coffie prepared next to you!
...
But no matter how funny; Daves is asking indeed good quesions from which answers the majority will benefit.
Good guideline for the book!

Let's cooperate and kidnap Carl We will ask all the questions and get answers.

[ivconic]

Let's cooperate and kidnap Carl We will ask all the questions and get answers.

... or wait for the ITMD3 book release!
I am looking forward.
Becuase all the questions you scattered on several topis also I would like to hear being answered from somebody who knows the things much better than me.
Don't guess me wrong; you asked indeed all the good and constructive questions. But on rather funny way... I say.

[Daves]

Direct sampling, baseband sampling, and all-analog receivers are hugely different. My recommendation is start with all-analog and learn the basics; then baseband sampling and learn baseband DSP; the direct sampling last.

I don't know what example TX drive you're talking about. VLF? PI? Many TX circuits recycle energy so what you really want to focus on is the peak coil current and number of turns in the TX winding. So-called "ampere-turns."

Carl, i have a special question for you.
What is frequency? What do you define frequency as? What actually opens and closes? (cell, atom...)
Note: I'm not asking this in terms of detector. According to the laws of physics, what is actually defined as frequency? What opens and closes?

[Carl-NC]

Frequency can apply to a whole lot of physical events, so it depends on what the event is. The frequency of a detector, the frequency of the sun rise, and the frequency of the finale of Nessun Dorma all involve different physics. I suggest starting with Wikipedia for something like this, go from there.

[Daves]

Frequency can apply to a whole lot of physical events, so it depends on what the event is. The frequency of a detector, the frequency of the sun rise, and the frequency of the finale of Nessun Dorma all involve different physics. I suggest starting with Wikipedia for something like this, go from there.

Well, they state that the human body also has a frequency. What do we measure as the frequency in people's bodies? What vibrates in the human body? What do you think about the vibration? According to a claim: we are actually vibrating, that is, the things we think are solid are not solid, we do not touch the things we think we touch.

[Qiaozhi]

Well, they state that the human body also has a frequency. What do we measure as the frequency in people's bodies? What vibrates in the human body? What do you think about the vibration? According to a claim: we are actually vibrating, that is, the things we think are solid are not solid, we do not touch the things we think we touch.

Perhaps you would be better off asking these type of questions here -> https://www.longrangelocators.com/forums/

[Carl-NC]

Well, they state that the human body also has a frequency. What do we measure as the frequency in people's bodies? What vibrates in the human body? What do you think about the vibration? According to a claim: we are actually vibrating, that is, the things we think are solid are not solid, we do not touch the things we think we touch.

"They" who state this are people peddling magic cures for ailments, bracelets to block bad energy, and gadgets to locate buried gold miles away. It's a bunch of baloney. Qiaozhi is right, the LRL forums are the place to ask these kinds of questions, in the Geotech forums we focus on things that really work.