Low Pass Filter | Electronic Project Circuits

Posts Tagged ‘Low Pass Filter’

Voice Bandwidth Filter

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 the values shown, the cut-off frequency (3dB point) is around 300Hz. As the op amp is powered from a single supply rail, two 10kO resistors and a 10µF decoupling capacitor are used to bias the input (pin 5) to one-half supply rail voltage.
The output of IC1a is fed into the second half of the op amp (IC1b), also configured as a Sallen-Key filter. However, this time a low-pass function is performed, with a cut-off frequency of about 3.1kHz. The filter component values were chosen for Butterworth response characteristics, providing maximum pass-band flatness. Overall voltage gain in the pass-band is unity (0dB), with maximum input signal level before clipping being approximately 3.5V RMS. The 560O resistor at IC1b’s output provides short-circuit protection.
Author: M. Sharp – Copyright: Silicon Chip Electronics
Source: http://www.extremecircuits.net/

Be the first to comment - What do you think? Posted by admin - September 8, 2010 at 4:03 am

Categories: Oscillator generator, RF-Radio Frequency Tags: active bandpass filter, Bandpass Filter, high pass filter, Low Pass Filter

Subwoofer Filter low pass frequency by LF347

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 Switch choose frequency level that can want as well. This circuit should choose high-quality equipment, because decrease the noise. The detail is other , see in the circuit.

Be the first to comment - What do you think? Posted by admin - January 22, 2010 at 9:16 am

Categories: Audio diagram, Power Amplifier, Pre Amplifier Tags: Low Pass Filter, subwoofer circuit

Low pass filter circuit 10KHz using uA741

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 music give for make wave form output the smooth. And press the noise that happen at output. When small-sized signal was managed with decrypt linear the size is 8 bit. Read more