Scalar electrostatic gradiometer

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Scalar electrostatic gradiometer

Thanks to Bob Shannon, TVQ, Boston MA


PARTS:

2 - TL082 dual JFET op amp (Tex. Inst)
1 - .001uF 50V ceramic disk capacitor
5 - .01uF 50V ceramic disk capacitor
3 - 100pF 50V ceramic disk capacitor
2 - 10uF 25V electrolytic capacitor
1 - 2M ohm potentiometer (lin. taper)
2 - 1M ohm potentiometer (aud. taper)
1 - Diode 1N914, 1N4148, or similar
1 - 100M ohm resistor (or five 22M in series)
2 - 120uH RF choke coil
1 - Ferrite toroid (T1, see text)
Resistors, 1/8W 5%
2 - 1M
2 - 47K
2 - 10K
4 - 6.2K
1 - 3.0K
1 - 1.5K
1 - 5mA panel meter
1 - 5mA panel meter, center zero (+-2.5mA meter.)
1 - DPST power switch
2 - Telescoping radio antenna
3 - Knobs for pots
1 - Silica gel dessicant bag (baked to dry it)
1 - proto circ. board
1 - Metal enclosure