Basically it is a ultra high gain OP AMP circuit with a few tweaks, plus an audio amplifier. The charge detector is a MOSFET transistor charge sensor hooked to a voltage to frequency oscillator. I still have not done the Hall effect sensor part.

The schematic for the EMF detector is here: http://www.eccentricgenius.com/wp/2008/11/14/tri-field-meter-part-2/

Still need to add the fancy stuff and the other detectors.

Thanx,Michael

Excellent comments all around. It seems that indeed people are misinterpreting the workings of the device.

I think you are right about the diodes, something to try. And yes a 2n2222 should work fine for this type of application, all we are after is reversal of polarity.

I am trying a new spam counter measure which does not depend on answering irrelevant weather-dependant questions to the poster.

The pulse and the delay are controlled through the POT. By adjusting the timing you get different effects, like time suspension and time going backwards. But it all depends on the rate of your water drops.

Gerry,

This phenomenon works because of the specific drops that the light lets you see in sequence. So if the ambient light is strong enough you will not see the effect because you will be able to see other drops at the same time.

It would be feasable to do one in large scale, but in that case look to use Stobe lights (the ones they use for dancing places), which can be regulated, instead of using LEDs.

NTT also has hooked something like this upto a remote control, although reading some of the responses here, it seems that some people dont fully understand what this does. It affects balance, it does not give you the ability to just control people mad scientist style and build an army to take over the world. By affecting balance you can add more realism to games, help people with a balance deficiency regain balance (using accelerometers or gyros for example and when they start to lean you apply a counter signal), etc. NTTs project is the ‘parasitic human’ one application they cite is having sensors that detect approaching vehicles behind you and guiding you off the road as they approach.

However looking at your schematic and the H-bridge, I am thinking that H-bridge may be slightly better with the addition of the 4 diodes. Without those diodes it would seem that 2 of the 4 transistors would have a more difficult problem passing current unless all of them were on.

While it may work as it is, I am thinking it may work better with those.

Also did you use fast, medium or what switching speed for the transistors? Given the application it probably does not matter all that much, but something like the ever present 2n2222 for example. My guess is it would work, and who doesnt have 4 of those laying around?

I answered your security question ‘what color is the sky’ correctly, for my location, given todays weather, and it was rejected, perhaps you should come up with something a little less specific