The unit discussed here indicates,
by means of achain
of LEDs, in logarithmic ratios
the strength of an electric field surrounding the unit. The input
signal across theconducting discs
is applied to the non-inverting
input of IC. The amplification
of IC1, A=R4/P1. In the prototype P1
was set at about 210 kΩ
to give an amplification of about
x50.
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