For those who have not seen it, this is based on SCMUTILS -- an open source symbolic manipulation engine, much like Mathematica or Maple. It is extremely powerful, and the book is worth reading just to understand the…
AA batteries are a negligible risk when you touch metal with skin. That resistance is very high. Resistance inside your body is much lower -- 100 ohms is typical. If you were to get 0.5v between you arms, you could get…
Skin resistance is quite low. You are thinking skin-electrode impedance. That is generally high enough to be safe, but with modern electrodes and luck, it can get somewhat low too. 5v 1k 5mA would not be unreasonable.
Good at lying with statistics. The plots don't say what the text does. Non-zero y axis makes tiny effects look big. Worst culprit are the age plots, which show retirees watching more tv than young'uns. It doesn't change…
You are incorrect. This circuit can potentially apply unsafe currents across the patient. A standard medical biopotential measurement circuit will have single-point failure protection to prevent conditions like this.…
For those who have not seen it, this is based on SCMUTILS -- an open source symbolic manipulation engine, much like Mathematica or Maple. It is extremely powerful, and the book is worth reading just to understand the…
AA batteries are a negligible risk when you touch metal with skin. That resistance is very high. Resistance inside your body is much lower -- 100 ohms is typical. If you were to get 0.5v between you arms, you could get…
Skin resistance is quite low. You are thinking skin-electrode impedance. That is generally high enough to be safe, but with modern electrodes and luck, it can get somewhat low too. 5v 1k 5mA would not be unreasonable.
Good at lying with statistics. The plots don't say what the text does. Non-zero y axis makes tiny effects look big. Worst culprit are the age plots, which show retirees watching more tv than young'uns. It doesn't change…
You are incorrect. This circuit can potentially apply unsafe currents across the patient. A standard medical biopotential measurement circuit will have single-point failure protection to prevent conditions like this.…