873
FREE
circuits!

Audio filter circuit diagrams

Variable High-Pass 20HZ to 200HZ Filter
Variable High-Pass 20HZ to 200HZ Filter
August 7, 2010

A simple circuit, High-Pass filter, variable between frequencies 20HZ until 200HZ, useful in a lot of cases elaboration of sound signals. The regulation is achieved with the double potesometer 47KΩ and the frequency response in... [more]

Remove common signal from stereo sound
Remove common signal from stereo sound
August 7, 2010

It many times happens, we want erase or decrease in a musical song, the voice of singer or some other sound that usually is written in same level and in the two channels. If we... [more]

Speech Filter
Speech Filter
August 7, 2010

The human speech apprehend a small area of frequencies, that is extended from 300HZ until 3KHZ. This spectrum is also internationally recognized for the transmission of speech via telecommunications networks. This is also the mainer... [more]

2nd Order Opamp Filters
2nd Order Opamp Filters
August 7, 2010

Three 2nd order filters are shown, low pass, high pass, and bandpass. Each of these filters will attenuate frequencies outside their passband at a rate of 12dB per octave or 1/4 the voltage amplitude for... [more]

Single Op-Amp Bandpass Filter
Single Op-Amp Bandpass Filter
August 7, 2010

A bandpass filter passes a range of frequencies while rejecting frequencies outside the upper and lower limits of the passband. The range of frequencies to be passed is called the passband and extends from a... [more]

RC Notch Filter (Twin T)
RC Notch Filter (Twin T)
August 7, 2010

The twin T notch filter can be used block an unwanted frequency or if placed around an op-amp as a bandpass filter. The notch frequency occurs where the capacitive reactance equals the resistance (Xc=R) and... [more]

Three Channel Audio Splitter
Three Channel Audio Splitter
August 7, 2010

This circuit is suitable to amplify and distribute the audio signals. The input audio signal is applied to the J1 and after passing through the P1, It is buffered and amplified by the IC1 prepared... [more]


circuit from:http://www.extremecircuits.net/2009/07/3-channel-audio-splitter.html

Low pass filter - Subwoofer
Low pass filter - Subwoofer
June 23, 2010

The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies. In the low frequencies is degraded the sense of direction. This reason us leads to the utilization... [more]