Filters circuit
Simple version. Full version location at http://circuitsradio.com
View original of this circuit: http://circuitsradio.com/schematics/electrical-engineering/Filters/index.html
A Weighting Filter For Audio Measurements
29.85 MHZ bandpass filter schematic
29.85 MHZ notch filter schematic
3KHz low-pass filter plus audio amp (PDF)
Active 2nd Order Filters
Active bandpass filters
Bandpass filters
Bandpass filters
Biquad Active Bandpass Filter Schematic
Butterworth filters
Chebyshev / Butterworth filters
CW filters
Digital signal processor (DSP) for radio communications
Filter Circuit for the Earthworm Seismic Data Acquisition System
Galaxy Noise Filter
Helical Resonator Notch Filter
LC filter design
Low-pass active filter
Multiple Feedback Bandpass Filter
Narrow band audio bandpass filter
RC Notch Filter (Twin T)
Self-tune filter
SSB AF filter
Wireless weater station
View original of this circuit: http://circuitsradio.com/schematics/electrical-engineering/Filters/index.html