Hi! I am planning to build a graphic equalizer, which I will probably use for my guitars and such. I just need a little bit of info on Equalizers, such as how the circuitry works. A schematic of a simple bass control circuit (or 1 band eq) would also come in handy, just to get me started

 

An audio equalizer can be simple bass and treble tone controls that boost, cut or adjust anywhere in between.
More advanced tone controls add a mid-frequency boost and cut control.

Complicated equalizers use many active filters that boost and cut many narrow frequency bands.

 

I'd say get a premade eq and insert it in an effects loop.

Building one is just too much work for what its worth as you get past 3 bands.

 

+1. Check out online, they are very cheap to buy.

http://www.jr.com/pyle/pe/PYL_PPEQ150/#productTabDetails

 

An audio equalizer can be simple bass and treble tone controls that boost, cut or adjust anywhere in between.
More advanced tone controls add a mid-frequency boost and cut control.

Complicated equalizers use many active filters that boost and cut many narrow frequency bands.

I think I understand a little better now. I was Filtering certain frequencies with a passive band pass filter, then amplifying them, then trying to mix it with the original signal itself (which was an EPIC fail by the way). But now I understand that you have to use active band pass filters in order for it to work properly

 

The link that Bountyhunter posted has great prices, but they're all out of stock.

Sears sells them: http://www.sears.com/shc/s/p_10153_...4&i_cntr=1328767664313&sid=IDx20101019x00001a
A bit more, but still a heck of a lot less than you'd spend trying to build one yourself.

 

J+R has a big selection of other EQs.

http://www.jr.com/product/productListing.jsp?Ntt=graphic+equalizer




I saw a ton of them on ebay too.

 

So why a graphic EQ?
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Most musicians like the parametric....
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Better control and a lot less hassle..
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Dataman19