Audio equalizer circuit how to#

using those component values I should be able to come up with a particular bandwidth and reuse that bandwidth but shift the center frequency to 500Hz. How to create a basic 3 band audio equalizer In this article, we'll be creating a simple 3-band equalizer that you can use for any audio project. However, for the particular equalizer I am making I want a center frequency of 500 Hz and all component values are given in the above diagram. How can you use this transfer function to create a bandpass filter of a particular center frequency? no information is given about bandwidth or cutoff frequencies.

Audio input signal is divided by variable resistors and given to separate base Inputs in the equalizer IC. This circuit takes single audio Input, you can split stereo audio or you can equalize by two LA3600 ICs. And, this project consists of stereos, right and left channels. The curve will be drawn by plotting the voltage levels of the audio signal with respect to the frequencies. Each band output can be varied by using variable resistors (VR). This equalizer circuit can be adjusted the frequency to 5 channels 60 Hz, 100 Hz, 1 kHz, 3 kHz, and 12 kHz. To properly test this EQ, we’ll analyze the frequency response curve of the audio filters. I got the following:įrom my understanding, this is a typical form for a transfer function for a bandpass filter. The amplifier circuit will boost the combined audio signal and direct it to a speaker. I used the node between c1 and c2 and the node between the negative terminal of the op amp and RF to find the transfer function. I was under the impression that the circuit could be reduced down to your normal inverting amplifier where the transfer function would be -(Z_f)/(Z_S) but it looks like part of 'Z_s' is also a part of 'Z_f' in the picture above and this is confusing me. A typical graphic equalizer consists of several audio filter/amplifiers, each centered at a specific frequency in the audio range. I am trying to find the transfer function of part of a 3 band audio equalizer circuit that amplifies low frequencies but I am confused about the topology.

Audio equalizer circuit