Ok, i'm hoping to build a 5 band graphic equalizer for use with the two channel LM1876 so, as expected, i have a few questions.
1. First off, i know very little about graphic equalizers and have been searching google for a few hours now. I found a 3 channel graphic equalizer (http://www.circuitstoday.com/category/audio-circuits/page/3); so, my question is: how did the creator of this circuit come up with the frequencies this adjusts (50Hz, 1kHz, 10kHz)?
2. Continuation of 1: if i understand how these values were calculated, could i add two channels/adjust these values to adjust what i want?
3. To equalize two channels, would i have to duplicate the RC circuit for both channels and just use input from the 5 pots for both circuits?
1. First off, i know very little about graphic equalizers and have been searching google for a few hours now. I found a 3 channel graphic equalizer (http://www.circuitstoday.com/category/audio-circuits/page/3); so, my question is: how did the creator of this circuit come up with the frequencies this adjusts (50Hz, 1kHz, 10kHz)?
2. Continuation of 1: if i understand how these values were calculated, could i add two channels/adjust these values to adjust what i want?
3. To equalize two channels, would i have to duplicate the RC circuit for both channels and just use input from the 5 pots for both circuits?
Artie said:
They leave off one important part of the design. What to do with frequencies above the hgh band and below the low band? The end bands need to not have a second cut off. Look at the last (at the bottom) section of this "classic" design. This might be the first equalizer ever sold. I think it might be 60 years old but the idea still applies today. (yes I might build this some day.)
http://www.triodeel.com/images/b9b.gif
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