Features: Stop filter module、 with high-end digital signal filter FIR、 can effectively improve the SNR Machine patch Onboard SMD LED power indicator On-board TVS tube、 to prevent external high voltage pulse / electrostatic damage board components Wiring is simple to use、 pin descriptions、 VCC and GND are input ports for the power and ground、 RST is the reset port、 active low、 VIN port reception filtered signal、 the output signal VOUT port after filtering. Choose a red jumper on the board when normal use、 select 0:00 when tested using、 T1、 T2 is the test port、 users do not need attention. Note that the input signal voltage VIN must be all positive、 so the sine wave signal has a half weeks of negative voltage、 1.65V may add a DC bias voltage、 the input signal for the whole positive. VIN-peak range must be 0 Specifications: Default shipping cutoff frequency: 1KHz-3KHz VOUT peak to peak voltage range: 0 Single power voltage range: 2V-3.6V Normal operating supply voltage: 3.3V Operating supply voltage: less than 3.6V Dimensions: 2.76 in x 1.97 in x 0.31 in (7.0 cm x 5.0 cm x 0.8 cm) Weight: 0.21 oz (6 g)