3D "AIR" EQ - "Night EQ" PCB's Complete!

[khstudio]

[quote author="enthalpystudios"]http://www.mouser.com/search/ProductDetail.aspx?R=MKS2-1.0%2f63%2f5virtualkey50520000virtualkey505-MKS21.0%2f63%2f5

i would get those. 5%, keeps the bands real nice and close. with full boards available, it's probably what I'd get. i mean, you just can't beat the price of this stuff.

the power supply, a parmetal case, and a frontpanel are easily 2/3 the cost of a project like this.

why not go the little extra?

i've been learning to not pinch pennies on parts, but instead pinch pennies on time, and pinch pennies on everything else in life ;]

for all the hard work and dedication, we owe it to ourselves not sell ourselves short.

it's such a tiny little detail, that it seems the only real answer to the question is to answer it your self by picking up 10 of each and building two channels.

i have some extra 1uf wimas if you want to try em out, i'll send em to you... i have 6 leftover from an order... not having the schematic handy, if thats enough to test out an air or 2.5khz channel, i'll send em your way... just pm me.[/quote]

They are the ones I was looking at... I REALLy like what this EQ does to the highs from the 2.5k (or 1.?k - like Harpo said it comes out to be) up... so if it gets any better - that's KILLER :green:

Thanks for the offer but you don't have to do that... I'll be ordering a shit load anyway if I decide to go that route :thumb: + you'll need some for your EQ.

Kevin

 

[khstudio]

x

 

[Purusha]

I guess I missed this info

What about the full version or at least adding the SUB?

Will you make the layout for this section too?

 

[khstudio]

x

 

[khstudio]

How much current (VA) do you think these will draw/NEED per channel?

I'm trying to get a parts list together for BOTH the FULL & CUT version.

Thanks,
Kevin

 

[enthalpystudios]

i'm not sure offhand, but for the most part, you can just get the max current draw off of the spec sheets for the opamps in question and add them up. that should be pretty much it. some allowance should be given for the current at switch on, as the transformer should be able to cope with providing current to the fullwave bridge and smoothing caps.

i'd say that if you add up the current draw for each opamp in the circuit, based on the specsheet max, and multiply times 2, and then multiply that by the supply voltage (like 15v or whatever it is), you'll have a good min VA rating for the circuit. You can always have extra VA on your power transformer without causing any harm

of course if its a HUGE ass power transformer, you may get quite a strong field of interference, but transformers like that probably run over 100 a piece and would be outside the diy realm for a project like this.

 

[khstudio]

Well I ordered a few 2x15v @ 15VA... hopfully these will be good for my 4 channel CUT version & a Stereo FULL version??

Thanks,
Kevin

 

[khstudio]

[quote author="khstudio"]Well I ordered a few 2x15v @ 15VA... hopfully these will be good for my 4 channel CUT version & a Stereo FULL version??

Thanks,
Kevin[/quote]

Correction... I ordered 2x18v @ 25VA (18V 1.388A )

Has anyone tried building one of these yet :?:
... You will be pleasantly surprised :green:

I got an email from Peter C today & it looks like the FULL Version PCB's will be ready in the near future :thumb:

Also, I build custom guitar amps & pedals for a lot of guys that have studio's & a few of them stopped by last week & I showed them the EQ I made & they gave me money up front for a few racks of the Shelves version... must have done something right.
- I'm getting some strange (faint) noise I can't really describe... maybe from being outside the case, hopfully it's this or the missing 100uH inductors...could be oscillation but I'm not sure. I'll post back with a better description of the noise or try to post an audio sample... hopfully someone can help me figure it out? :sad:

Kevin

 

[Harpo]

[quote author="khstudio"]I'm getting some strange (faint) noise I can't really describe... maybe from being outside the case, hopfully it's this or the missing 100uH inductors...could be oscillation but I'm not sure. I'll post back with a better description of the noise or try to post an audio sample... hopfully someone can help me figure it out? :sad:
Kevin[/quote]
in case it's oscillation, a 22pF ceramic cap at the traceside between pin 5/8 of the NE5534 should help you out. NE5532 is compensated internal.

 

[khstudio]

[quote author="Harpo"][quote author="khstudio"]I'm getting some strange (faint) noise I can't really describe... maybe from being outside the case, hopfully it's this or the missing 100uH inductors...could be oscillation but I'm not sure. I'll post back with a better description of the noise or try to post an audio sample... hopfully someone can help me figure it out? :sad:
Kevin[/quote]
in case it's oscillation, a 22pF ceramic cap at the traceside between pin 5/8 of the NE5534 should help you out. NE5532 is compensated internal.[/quote]

Thanks man :thumb:

You guys mentioned this before... about the 5534's & some NOT being stable, right? It's funny because I'm not using a Signetics like the original - I only have JRC5534D around but I did order some TI NE5534AP's to try.

I am tesing it out now & will try the 22pf - easy enough.

I finished my faceplate last night but need to figure the noise out before moving on

Kevin

 

[khstudio]

x

 

[BR]

Dude, that looks great. I think I really need one of those 4 pack.
What knobs are those? They look like Elmas.

 

[khstudio]

[quote author="BR"]Dude, that looks great. I think I really need one of those 4 pack.
What knobs are those? They look like Elmas.[/quote]

Yea I'm pretty stoked about this one too. I made 6 different faceplates yestarday for several projects... I feel like a factory.

Knobs are from Radio Shack... I WISH I knew where to get them in bulk because Radio Shack bumps the price

I make my own faceplates in FPD, then mirror the image, print on lable paper (BACK/ WAX Side) , Super 77 glue (spray) the face then CARFULLY lay the cut out pieces on, then rub them on til they stick, peel off, let dry & Clear Coat... DONE :green:

Thanks,
Kevin

 

[cannikin]

Wow Kevin

thats looks fantastic -- can't wait to build it.

 

[khstudio]

[quote author="cannikin"]Wow Kevin

thats looks fantastic -- can't wait to build it.[/quote]

:thumb:

For those of you who have emailed me for the files please hang in there :!:

I'm refining a few things on the PCB & Schematic to make things a little more clear & to make this DIY as smooth as possible. The 470uf/25v caps on the board are too large for the Linear Supply & should be lowered to about 47uf/25v... this was brought to my attention by Harpo. Also, the need for the 100uH inductors is unknown at this point but my prototype is working fine without them. I did order them (2 types are available - Epoxy & Ferite based... I DO NOT KNOW IF ONE IS "BETTER" THAN THE OTHER -   if anyone knows please help out on this one.


-  for the Lazer printer/77 Glue method. (if you don't know what that is - Please do a search)
- for sending it out you'll have to mirror the image & adjust a few small items, no biggie.

 

[Purusha]

Hi Kevin, nice design :thumb:

Do you mind if I do something similar and offer the racks to the guys here?
Would you happen to have a jpg version of your design?

 

[khstudio]

[quote author="Purusha"]Hi Kevin, nice design :thumb:

Do you mind if I do something similar and offer the racks to the guys here?
Would you happen to have a jpg version of your design?[/quote]

I don't mind at all man. :wink:

But... I would probably wait a little bit to see how things pan out with this project & to see how many people are interested.

I'll need a little time to try & make a pic of it & get it to you... hang in there & I'll see what I can do.

kevin

 

[Purusha]

Sure, no hurry :grin:

 

[okgb]

Looks great Kev !

thanks for all your effort on that one
if i was smarter i'd help more

but i am infor a couple of boards if you make them

regards Greg

 

[tomcat]

This Forum is worse then a dozen slotmachines

Coool project. :thumb:

Dont know which project to finish first, but the JRC5532D i ordered already :green: