There are 33 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Thursday, 3 September 2015.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
Design of active filters with operational amplifiers (includes circuit and Java filter calculator)FilterJan 16, 2010Status1 vote up vote down
Filters for the RadioJove ReceiverFilter Status0 vote up vote down
Low pass filter for subwooferFilter Status-1 vote up vote down
Fourth order Butterworth BPF circuit diagram and design notesFilterJun 19, 2011Status0 vote up vote down
Chebyshev low pass filter, rolls of at 30MHzFilterJun 19, 2011Status0 vote up vote down
Collection of quartz crystal ladder filter circuit diagramsFilterOct 07, 2009Status0 vote up vote down
45 to 90Hz hum filter circuit diagramFilterSep 13, 2006Status0 vote up vote down
1KHz 4th order Butterworth filter using LT1367 quad operational amplifierFilterJul 03, 2011Status0 vote up vote down
20KHz Butterworth active filter using Linear Technology LT1124, LT1355 or LT1169FilterMay 25, 2012Status0 vote up vote down
'A' Weighting Filter For Audio MeasurementsFilterSep 13, 2006Status0 vote up vote down
Multiple Feedback Bandpass FilterFilterNov 01, 2002Status0 vote up vote down
Active bandpass filter with TDA2320AFilter Status0 vote up vote down
Higher Order Analog Butterworth Filter Designs, includes on-line filter calculatorFilterJan 16, 2010Status0 vote up vote down
4th Order Butterworth filter schematic and calculatorFilterJan 16, 2010Status0 vote up vote down
Sallen-Key Low Pass Filter Calculator (handles Butterworth filters, Bessel filters and Chebychev)FilterJan 16, 2010Status0 vote up vote down
3KHz low-pass filter plus audio amp (PDF)FilterJan 26, 2001Status0 vote up vote down
Series Notch Fliter Designer / Calculator (displays circuit diagram after calculation)FilterJan 16, 2010Status0 vote up vote down
Analog Filters for Data Conversion (ADC filter)FilterJan 16, 2010Status0 vote up vote down
RC Low-Pass Filter with Op Amp Buffer (single pole filter) with SPICE simulation filesFilterJan 17, 2011Status0 vote up vote down
Sallen-Key Low-Pass Filter (Double-Pole) with SPICE simulation filesFilterJan 17, 2011Status0 vote up vote down
Active bandpass filtersFilterNov 01, 2002Status0 vote up vote down
Bandpass filtersFilterNov 01, 2002Status0 vote up vote down
A-weighting filter from an old Ampex service manualFilterMay 07, 2010Status0 vote up vote down
3 KHz low pass filter plus audio amplifier circuit diagramFilterApr 14, 2010Status0 vote up vote down
Sallen-Key Active Butterworth High Pass Filter Calculator and circuit diagramFilterJan 16, 2010Status0 vote up vote down
Sallen-Key Active Butterworth Low Pass Filter Calculator and circuit diagramFilterJan 16, 2010Status0 vote up vote down
Chebyshev / Butterworth filtersFilterJun 13, 2002Status0 vote up vote down
Biquad Active Bandpass Filter SchematicFilterNov 01, 2002Status0 vote up vote down
Digital signal processor (DSP) for radio communicationsFilterJun 06, 2003Status0 vote up vote down
29.85 MHZ bandpass filter schematicFilterNov 01, 2002Status0 vote up vote down
29.85 MHZ notch filter schematicFilterNov 01, 2002Status0 vote up vote down
Variable notch filter with both high and low pass filtersFilterSep 13, 2006Status0 vote up vote down
LC filter design on-line calculatorFilterJun 13, 2002Status0 vote up vote down