This circuit passes frequencies in the 300Hz – 3.1kHz range, as present in human speech. The circuit consists of cascaded high-pass and low-pass filters, which together form a complete band-pass filter. One half of a TL072 dual op amp (IC1a) together with two capacitors and two resistors make up a second-order Sallen-Key high-pass filter. With [...]
This be subwoofer filter low pass frequency circuit, for filter especial low frequency has passed by still the amplifier microphone. By this circuit uses op-amp IC number LF347 , perform the circuit filters low frequency change well, It make the sound that go out to have only low frequency ,about 100HZ not exceed. By have [...]
This be the circuit filters 10KHz low size frequencies s use IC op-amp the highly popular number uA741. By this circuit convenients for to apply to input and output of the circuit changes analog signal be digital or the circuit changes digital signal be digital. In sound system of digital for synthetic the voice or [...]
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