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Filter circuits and schematics collection
- “A” Weighting Filter For Audio Measurements
- 136KHz bridged-T notch filter to reduce strength of the German utility station DCF39 on 138.83 kHz
- 1KHz 4th order Butterworth filter using LT1367 quad operational amplifier
- 29.85 MHZ bandpass filter schematic
- 29.85 MHZ notch filter schematic
- 3 KHz low pass filter plus audio amplifier circuit diagram
- 3KHz low-pass filter plus audio amp (PDF)
- 440 Hertz Peaked Low Pass Audio Filter Experiments
- 45 to 90Hz hum filter
- 4th Order Butterworth filter schematic and calculator
- ‘A’ Weighting Filter For Audio Measurements
- Active bandpass filter with TDA2320A
- Active bandpass filters
- Analog Filters for Data Conversion (ADC filter)
- A-weighting filter from an old Ampex service manual
- Bandpass and IF Filter Circuits
- Bandpass filters
- Biquad Active Bandpass Filter Schematic
- Chebyshev / Butterworth filters
- Chebyshev low pass filter, rolls of at 30MHz
- Collection of quartz crystal ladder filter circuit diagrams
- CW Filters
- Design of active filters with operational amplifiers (includes circuit and Java filter calculator)
- Digital signal processor (DSP) for radio communications
- Discrete Component Audio-Frequency RC Filters
- Filter Circuit for the Earthworm Seismic Data Acquisition System
- Filters for the RadioJove Receiver
- Fourth order Butterworth BPF circuit diagram and design notes
- Galaxy Noise Filter
- Higher Order Analog Butterworth Filter Designs, includes on-line filter calculator
- LC filter design on-line calculator
- Low pass filter for subwoofer
- Low-pass active filter
- Matching Low Pass Filter for 136kHz transmitter
- Multiple Feedback Bandpass Filter
- Multiple Feedback Bandpass Filter
- RC Low-Pass Filter with Op Amp Buffer (single pole filter) with SPICE simulation files
- Sallen-Key Active Butterworth High Pass Filter Calculator and circuit diagram
- Sallen-Key Active Butterworth Low Pass Filter Calculator and circuit diagram
- Sallen-Key Low Pass Filter Calculator (handles Butterworth filters, Bessel filters and Chebychev)
- Sallen-Key Low-Pass Filter (Double-Pole) with SPICE simulation files
- Self-tuning CW filter
- Series Notch Fliter Designer / Calculator (displays circuit diagram after calculation)
- SSB AF filter
- Variable notch filter with both high and low pass filters
