Build an antique EMG with vacuum tubes like in the 1950s and 1960s.

That's brilliant. I just want to understand how capacitive coupling from AC lines or harmonics (can this occur?) behave using EMG with vacuum tubes, transistor and the modern op-amps version.

Do vacuum tubes and transistors also have differential inputs and common mode rejection? We can just do a mental exploration of them if it's so difficult to acquire them.

I just want to know if there is any possibility any noises in the vacuum tubes and transistors can also somehow do some measurement like in the idea of chaos where order is hidden in the disorder. Chaos Theory.

 

Let me go to specific. Let us go back to 1971.

Radiotelemetric Cardiorespiratory Determinations During Submaximal Dynamic Exercise (arizona.edu)



Let us focus on this telemetry device developed by Bio-Sentry. The company has model for EMG too. In 1971. They didn't use IC and so I pressumed all used transistors? Did they still use vacuum tubes in the 1960s when the product was first developed?

I'm interested in this because at that time, they could acquire signal at the higher frequencies like 1000 kHz. Right now. All our EMG acquire signal at only around 250 Hz. So I want to understand, could the transistors they use have more noises? Or could it be more sensitive that it can acquire more signal like in Chaos Theory? Something that all our IC based electronics could no longer do?

Can you think of a way the noises of transistors in the 1960s can get capacitive coupling from higher frequencies or other noises that can produce say 1000 kHz especially since they use 215-260 Mhz telemetry on the EMG signal?

 

Transistors made in 1960 were rare and very expensive. They had poor specs and probably made a lot more noise than transistors made in 1970s.

 

Please forget about capacitive coupling that requires a high voltage and a short distance. Capacitive coupling produces common-mode interference on the signal. Then the differential input instrumentation amplifier cancels the interference but also cancels your capacitive coupled signals.

Please read about the history of vacuum tubes, old germanium transistors, newer silicon transistors and ICs.
Also please read about the history of radio frequencies and radio circuits since in 1945 people listened to their FM radios that operated at 100MHz. I made an FM radio from a kit in 1960.

 

I still have no idea what capacitive coupling of audio signals has to do with an EMG. The signals for an EMG are injected through needles inserted into the muscles. And it is painful, I know, I had one once. You are not qualified to be working on such a device in the first place. Who are you going to be sticking needles into?

 

All great scientists perform their experiments on themselves first...right?

 

I'm not sticking any needles and will never do that. I'm doing experiments on dark matter detection, those that haven't been tried by CERN and particle physicists before. You see. Our body is the most sophisticated electronics in the universe. So if there was dark matter, our body should evolve or adapt to use dark matter. So I'm trying to use surface EMG to measure any trace of dark matter that could be coursing through our body. Some scientists believe the acupuncture points have unique electrical properties, and some claimed to have measured currents through them. Actually some of them theorize some kind of interactive dark matter was coursing through the so called acupuncture points. And I'm just trying to measure them. And in case the claims of those who detected them were wrong. I am thinking how they could be wrong, like could capacitive coupling just messed up their detectors, or noisy electronics, or other factors.

Btw.. this is compatible with dark matter observations because if only a few small sector of dark matter is self interacting, it won't be ruled out by any cosmic observations like the bullet clusters, etc. And lastly I'm not doing this because I have to believe in the body evolving to make use of dark matter. I'm just doing experiments to narrow the searches and not miss any corners it could be lurking. How do you make the most sensitive detectors that can detect currents in the acupuncture points besides EMG? I can't use superconductors like SQUID because I don't want to deal with super low nitrogen temperatures that could be dangerous if you got exposed to it and can freeze immediately. What other super sensitive electronics could do it?

 

 

Have fun.