Here is one of my slipknot electrodes, made of desoldering braid**. The two diff inputs go on wrists, the center ground goes on neck.
I tried it out, and got nice sensitive diff motion on the meters. One meter shows the side-to-side diff, and the other shows the mean current drawn by both.
BUT: Before I could settle into an experimental mode, I realized the applied voltage was painful on both the wrists and neck, and I could also tell that the voltage was starting to affect brain and heart. Possibly getting into the vagus nerve. I switched off quickly and gave up the attempt.
SE-LU. Loosen yourself. Don't worry about sunk costs and amortizing effort. From now on I'll stick to non-invasive ckts! [But then I made this same promise earlier after another zap experience, and didn't stick to the promise....]
QUESTION: Aside from the differential aspect, this setup applies roughly the same voltage and current to the body as Volney's original tube version. The E-meter, after Hubbard took it over, was considered to be a passive "auditor" in Hubbardese. It wasn't advertised as an active shaper of brain and heart function. When the "therapist" adjusted the E-meter, was he really adjusting the stress response of the victim?
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**Hint: Desoldering braid is a wonderful material for making 'organic-like' conductors. It flexes more smoothly than wire, it makes a broader contact with a surface than wire, and by definition it takes solder easily.
The current icon shows Polistra using a Personal Equation Machine.