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ELECTRIC FIELD DISTURBANCE MONITOR

By August 21, 2010


ELECTRIC FIELD DISTURBANCE MONITOR…[more]

:This schematic is the
power supply and front-end sections of the field monitor that is
discussed in more detail at
. The system can detect human and
animal motion by the electric fields they disturb.

29.85 MHZ Notch Filter Schematic:

Adjustable 60Hz Filter: to filter out any HUM that may be picked up
by a noisy power supply or long wire connection

Adjustable Audio Notch Filter:

Audio Notch Filter:

Basic
Introduction to Filters: application notes on active, passive and
switched capacitor filters, document in PDF format

Build an adjustable high frequency notch filter:  EDN-Design Ideas
/  Although you can obtain universal, resistor-programmable
switched-capacitor filters that are configurable as notch filters, most
cannot operate at bandwidths higher than 100 kHz. Further, the typically
16

Closing the loop deepens notches:  EDN – Design Ideas /  Notch
filters remove a single unwanted frequency from an input signal. They
are also a vital component of pulse-shaping netw1orks, such as
time-averaging filters. You can tune a state-variable filter over a wide
range by changing the time constants of its integrating amplifiers
(references 1, 2, and 3). .

CW Filters:

Helical Resonator Notch Filter:

High Q
Notch Filter: National Semiconductor Application Notes first
published28-Jun-1996

Inversal Notch and Bandpass Filter:

Notch Filter is DC Accurate: EDN Design Ideas

Notch Filter uses only Lowpass Filters:  EDN Design Ideas

RC Notch Filter tw1in T: The tw1in T notch filter can be used block an
unwanted frequency or if placed around an op-amp as a bandpass filter.
The notch frequency occurs where the capacitive reactance equals the
resistance Xc=R and if the values are close, the attenuation can be very
high and the notch frequency virtually eliminated.

Single Supply Sallen Key Notch Filter:

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