ANALOG Meter Movements, or,
points in digital meters where 100-300
millivolts full scale is available

Audio Sensing Add on for [Tri] Field Meters
plus Wiring Tips for Biosensing Connections
February 7, 2001



At date above, the below schematic is the first working prototype.  As with
all experimental circuits, it is subject to change.

audsens1.gif Schematic
audpanel.gif Panel layout
audmeter.gif Meter jack installation
mtr2eeg.gif Meter mod for EEG use
stemtrod.gif Plant stem electrode
The idea is that [Tri] Field Meters belonging to members of our group are probably sensitive enough to detect the small biological EMF field changes which occur in our bodies, as well as house plants and maybe pets, provided our attacks are delivered in "bursts" as opposed to slowly. Some "burst" type attacks are: - sudden "electronic caffeine injections" - limb flailing - electric shock sensations - hot needles in the flesh sensations It may also be, but this is only theoretical at the moment, that continuous voice to skull could be detected in some way using an audio-sensing add on to a [Tri] Field Meter. In this application, the meter itself would probably be connected to a pickup coil. A meter without a jack for antenna connection may need to be disassembled and an external coil with its axis parallel to an internal sensing coil may be needed. INSTALLING A JACK IN A TRI-FIELD METER (MUST BE ANALOG, NOT DIGITAL) !!!! DO NOT DRILL UNTIL YOU HAVE READ THIS SECTION !!!! ** Refer to "audmeter.gif" image above. First, an EXPERIENCED TECHNICIAN should do this. Reason is, you are tapping the meter movement itself which can be wiped out by mistakenly feeding any voltage directly to the terminals. If you can find a convenient spot for a 1/8" MONO jack (MONO IS ESSENTIAL, AND SO IS OPEN-CIRCUIT) phone jack, first be sure there is no way an accidental contact can occur between the jack elements WITH PLUG PUSHED IN and wiring attached. The jack wiring must include a heat shrink tubing insulated 4.7 K (4,700 ohm) 1/4 watt or 1/8 watt resistor in the tip lead. Verify with an external ohm meter that the negative terminal on the meter movement connects to ground on the meter's case, if metal. IF NOT, YOU MUST USE A SMALL, TIGHT-FITTING GROMMET AND BRING OUT A PIGTAIL WITH A 1/8" MONO IN-LINE JACK. A shielded lead is recommended, with the shielding connecting to the "ground" side of the jack. The tip lead must connect to the terminal on the meter movement marked "+". As a user, take care to never apply voltage to that jack or pigtail - the safety resistor will protect low voltages but can't be counted on to protect against all voltages. ===========================================================================
*** BIO-SENSING EXPERIMENT WIRING TIPS *** biosens1.gif The above diagram is an arrangement for using any sensitive instrument such as an EEG or [Tri] Field Meter to detect electromagnetic disturbances of your body, your house plants, or pets, during psycho-electronic attacks. It is recommended that the SOLDERING be done by someone with experience, and that where wiring is anchored only by solder, silicone rubber support be added so the stranding is less likely to break. NOTE: There is one excellent compromise instrument on the market, a good balance between sensitivity, cost, and features. It is the "Tri Field Natural model meter", at this link: If that link is broken, try this one: tri-nat.htm The arrangement diagram above, though, applies to any instrument, and those Tri-Field meters which have no external jacks would need certain inside components connected to an outside jack in order to function in this way. >> Taped-on electrodes can be used, however, pickup coils are much easier to work with. The arrangement drawing above would also apply to electrodes. Keep the potentiometer mounted in a pill vial, and connect the leads to a pair of silver (artificial silver is OK) coins with leads soldered to them. --------------------------------------------------------------------------- biosens2.gif The diagram above shows a system of quick disconnect, convenient and reliable pins and sockets for your pickup coil and accessory wiring. Again, if you are not experienced in soldering, it's best to have someone do the soldering and/or show you how. (This is especially true for the internal wiring of the "potentiometer mounted in a pill vial" shown in the first diagram. If the potentiometer is not properly wired, and the slider wire doesn't face toward the instrument, you may get no sensing or sensing with too much noise or signal strength.) These so-called "D-submini" pins can be crimped with an el-cheapo Radio Shack crimp tool, #276-1595, however, BECAUSE YOU WILL BE SOLDERING THE PINS ANYWAY, CRIMPING WITH NEEDLE NOSE PLIERS WILL WORK FINE ALSO. A small plastic (aluminum jaw covers) vise is very handy for making up instrumentation cables. --------------------------------------------------------------------------- biosens3.gif The image above shows how to make the in-line 10 K potentiometer used to control the signal level fed from your pickup coil to the measuring instrument. This component is EXTREMELY important. Without it, noise and signal overload problems are almost assured. ===========================================================================

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