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The BrownDog Dual Sallen-Key filter circuit is a printed circuit board on which two complete and independent two-pole filters can be constructed from surface mount components using the Sallen-Key topology. Pads for resistor and capacitor chip components will accommodate either 0805 or 1206 size devices. Because the performance of Sallen-Key filters can be sensitive to component value variations, dual sets of chip component pads connected in parallel are provided on both sides of the board for each filter element; these allow the user to trim to the required values. Using an SO8 dual op-amp with industry standard pinouts (available from many manufacturers), two independent two-pole filters can be fabricated to realize low-pass, band-pass, or high-pass configurations. The filter circuits can be cascaded for higher order responses. The Sallen-Key topology allows the use of current feedback op-amps for high frequency designs.
Power supply decoupling capacitor pads are provided and most of the reverse side of the board serves as a ground plane. The circuit's compact size allows it to be plugged in a 24 pin DIP IC socket (0.600" wide) or any solderless prototyping board.