Filter

· Voltage Controlled State Variable Filter

· Galaxy Noise Filter

· RC Notch filter

· Low-pass active filter

· Filter Circuit for the Earthworm Seismic Data Acquisition System

· Active 2nd Order Filters

· RC Notch Filter (Twin T)

· Multiple Feedback Bandpass Filter

· CW filters

· Self-tune filter

· SSB AF filter

· Helical Resonator Notch Filter

· 3KHz low-pass filter plus audio amp (PDF)

· Active bandpass filters

· Bandpass filters

· Butterworth filters

· Narrow band audio bandpass filter

· Single-Supply Sallen Key Notch Filter

· Single-Supply Twin T Butterworth Low Pass Filter

· Inversal notch and bandpass filter

· DC Accurate, Active RC Lowpass Filter

· Chebyshev Bandpass Filter

· Bandpass filters

· Chebyshev / Butterworth filters

· Biquad Active Bandpass Filter Schematic

· Voltage controlled filter and oscillator

· "A" Weighting Filter For Audio Measurements

· Multiple Feedback Bandpass Filter

· Digital signal processor (DSP) for radio communications

· 29.85 MHZ bandpass filter schematic

· 29.85 MHZ notch filter schematic

· LC filter design