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ELECTRIC FIELD DISTURBANCE MONITOR:This schematic is the
power supply and front-end sections of the field monitor that is
discussed in more detail at
Electric Field Disturbance Monitor. The system can detect human and
animal motion by the electric fields they disturb. |
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29.85 MHZ Notch Filter Schematic: |
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Adjustable 60Hz Filter: to filter out any HUM that may be picked up
by a noisy power supply or long wire connection |
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Adjustable Audio Notch Filter: |
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Audio Notch Filter: |
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Basic
Introduction to Filters: application notes on active, passive and
switched capacitor filters, document in PDF format |
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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 |
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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 networks, 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). . |
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CW Filters: |
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Helical Resonator Notch Filter: |
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High Q
Notch Filter: National Semiconductor Application Notes first
published28-Jun-1996 |
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Inversal Notch and Bandpass Filter: |
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Notch Filter is DC Accurate: EDN Design Ideas |
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Notch Filter uses only Lowpass Filters: EDN Design Ideas
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RC Notch Filter Twin T: The twin 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. |
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Single Supply Sallen Key Notch Filter: |
