i want to build an 3-way equilizer with gain and volume pots. how much would this cost. this is my first project, any ideas or schematics
everything else is just details
In your guitar? sounds like a pretty stupid idea, You'll always need to handle with more than one EQ, it'll really piss you off sometimes.
if you mean in a pedal/stompbox then i'd keep the EQ and gain in seperate boxes, its simpler this way, and for a first project thats essential, there are loads of schematics for pedals out there, fuzz face being a popular first build, the EQ is more doable with the first project under your belt
they have a 3 band EQ buid on www.runoffgroove.com
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You might just buy a used rack unit, stick it up top of your head. I picked up a decent delay unit, meant for a studio rack or whatever, for about $90 usd. Much easier than building one, I'd say.

You also need to decide if you want parametric or multi-band. There are advantages and disadvantages to both. Parametric is probably better in the technical sense because there is less temporal distortion (latent delay) - see, every little EQ fader introduces it's own delay, which is how it works, really, but you can't EQ the sound without gumming it up. Multi-band introduces a lot of delay at various frequencies (duh!) so your sound will be quite artificial.

Here's the deal: multibands are set to specific frequencies, so you have five or more little faders to control those set frequencies. You are unlikely to get a really nice, clean sound out of one of those. A good distorted tone? Hell yes!

Parametrics are built on a basic bass/high foundation, with set "shelf" EQ's controlling the bass range and treble range. The mids are controlled by a "sweep" knob (this sets the frequency that is most affected), a level knob, which controls the amount of EQ just like the low and high shelfs, and a "q" knob, which controls how wide a frequency range is affected by the EQ.

These "parameters" are under your control, and allow you to have a very scientific control over your sound. Because you are only dealing with three little knobs (essentially), there is less distortion than with a multiband EQ. Such units are normally employed to control feedback in a live situation, but like any tool are definitely adaptable to other purposes.

Trouble with parametric, though, is sometimes you just can't quite get the sound you are looking for - say you want a solid metal sound. For metal, hard rock, shred or even fusion you might think about going multi anyway, because your sound will likely be distorted and you're going for a more synthetic groove.

For a jazz tone, or possibly blues (depends on the style of blues, though), you would want parametric.

Confused yet?

Someone suggested a different first project. That's not bad advice.

Still, if you're daring then go for it.
"Virtually no one who is taught Relativity continues to read the Bible."

Geofex has a whole page on tweaking EQ's.

And I too suggest a different first project. Maybe a booster with a tone pot.
I'm not very active here on UG currently.
I'm a retired Supermod off to the greener pastures of the real world.
thanks , ill take ur advice and make this 1 after i get a few esier pedals under my belt
everything else is just details