and if you load it through the AC line?

Your probably correct, took the foil off;  tried out a high power Tesla and WHAM! East coast went dark......

And now for something completely diffent...............

Gee Marty, methinks we got away from the suject here. Sorry everone!

So..........If we realistically look at a problem there is always a solution. I have been gining the Tesla as an example, but looking for real feed back as how to do it, not "it can't be done". I was always told can't can't do anything.

Anyway, other approaches to jamming can include harmonic amplification( as in h of n(x) = A of n cos(n omega t+thea of n) are the harmonics, let's see how about a 25ns 500V P-P spike in the line? on and on......


any EE's out there?


Aldo

Sorry Marty, I find that you are an EE.  I'm an engineer producing 95nm gates curently running 37 GHz technology. How about you?

Aldo

No relationship between Tesla coils and linear 13.56MHz amps, no experience with polys to date.

I guess my main point is that polygraphs are sensitive pieces of equipment and should inherently be subject to EMI if purposely designed to do just that. Of course $$$ is always a driving force to any new innovation.

Electronic jamming is not new, nor confined to specific areas. 

Search the following:

Skin Conductance and Cardiac Responses to Masked Presentations of Fear-Relevant and 
-Irrelevant Conditioned Stimuli

Changes in human skin conductance are frequently used as an indirect measure of a subject’s cognitive effort, emotional arousal, or level of attention.  Recording skin conductance responses (SCRs) is useful during 

"Psychologists have been trying to identify universal patterns of physiological response since the early 1900s, but without success. We believe that the lesson to be learned there is that there are no such universal patterns," said Smith. 

Galvanic Skin Response is a measure of the skin's conductance between two electrodes. Electrodes are small metal plates that apply a safe, imperceptibly tiny voltage across the skin. The electrodes are typically attached to the subject's fingers or toes using electrode cuffs (as shown on the left electrode in the diagram) or to any part of the body using a silver-Chloride electrode patch such as that shown on the EMG. To measure the resistance, a small voltage is applied to the skin and the skin's current conduction is measured.

Skin conductance is considered to be a function of the sweat gland activity and the skin's pore size. An individual's baseline skin conductance will vary for many reasons, including gender, diet, skin type and situation. Sweat gland activity is controlled in part by the sympathetic nervous system. When a subject is startled or experiences anxiety, there will be a fast increase in the skin's conductance (a period of seconds) due to increased activity in the sweat glands (unless the glands are saturated with sweat.)

After a startle, the skin's conductance will decrease naturally due to reabsorption. There is a saturation to the effect: when the duct of the sweat gland fills there is no longer a possibility of further increasing skin conductance. Excess sweat pours out of the duct. Sweat gland activity increases the skin's capacity to conduct the current passing through it and changes in the skin conductance reflect changes in the level of arousal in the sympathetic nervous system.

The electromyographic sensors measure the electromyographic activity of the muscle (the electrical activity produced by a muscle when it is being contracted), amplify the signal and send it to the encoder. In the encoder, a band pass filter is applied to the signal. For all our experiments, the sensor has used the 0-400 microvolt range and the 20-500 Hz filter, which is the most commonly used position.

Most people cannot mentally control their skin conductivity response in any kind of rapid and fine-tuned way. The response can take seconds to arise and longer to decay. However, you can experiment with thinking of exciting or calming thoughts and watch how your galvactivator responds. Once you have dialed it to your proper baseline, the galvactivator should be sensitive enough to respond to internally-generated imagery in a broad way. 

The startle reflex is a characteristic spike in the galvanicskin response that usually occurs 1-3 seconds after the onset of a startleprobe or a novel stimulus. Typically, a startle probe refers to a loudnoise, bright light, or puff of air designed to “startle” or suddenly divert the attention of the subject. A similar spike in conductivity can be generated when a subject "orients" to a new stimulus -- a person suddenly standing next to you, for example. 

Can someone tell if I am lying? 
Not with the galvactivator, though the galvanic skin response is one of the measures commonly used as part of a lie detecting apparatus. However, detection of deception requires a thorough experimental setting which does not compare to everyday’s use of the galvactivator. 

More later, Nuff to chew on.

Aldo

So how many manufactures are they? What components are common? Just curious. Mainly interested in the type of sensors and IC's utilized.

Oh yes, a friend of mine is replacing a cap in an old stereo system. Question posed is which type is best, electrolytic, mylar, or ceramic? The former is best for filtering but I'm not sure about it's general effect on the sound. Any ideas?

Gee, went off the subject.......

So you think the EMI protection within the unit exceeds the ability to disrupt it's functionality?

On the subject of conductivity sensors, what if you went to a poly with a tinge unit on?



Aldo

Marty wrote on Aug 22^nd, 2003 at 9:06pm:


Actually, I think it stands to reason that the GSR instrument would be the most vulnerable to externally-generated electric fields.  It's likely that those fields would need to be fairly strong and low frequency, though.

In my experience, the wires connecting the GSR (ohmmeter) to the fingers are not shielded, which would probably be the weak point for messing with the recorded signal.

Skeptic