Circuit / Schematic diagram of  Description
Band Pass  

29.850 Band Pass Filter

Single OpAmp Band Pass filter  
Active Band Pass Filter Time honored multiple feedback band pass (MFBP) type which uses capacitors of equal value and leads us to simplified calculations.
24dB Band Pass Filter Filter circuit along with power supply unit
Band Pass IF Filter  
Notch/Band Pass Filter  
Multiple Feedback Band pass filter  
Self Twining CW Filter  
Low Pass  
Low Pass Active Filter OpAmp based low pass filter.
SSB AF Filter This is a simple filter that restricts the LF response a little as well providing quite a heavy HF roll-off.
1 MHZ Low Pass filter The filter circuit uses no inductor.
Low pass filter Filter tuned by a single resistor.
High Pass  
Second order high pass filter  
Notch Filter  
Adjustable Notch Filter They can be used in your small pre-amp or amplifier project to filter out any HUM at 50 Hz  or 60Hz .
Variable Notch Filter Variable notch filter with both high and low pass filter
Helical Resonator Notch Filter  
High Q Notch Filter  
RC Notch Filter  
Twin T Notch Filter This allows us to remove the 50Hz hum picked up by, say, a microphone cord.
Transient Noise Eliminator  
Galaxy Noise Filter Schematic  

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