S.Master Eq Project (Docs added)

ForthMonkey · Apr 25, 2015

I finished Studio Master eq design.It's simple and quite good to me.

This project tested by Humner.And it's working.[

You can download files from here;

https://analogobsession.wordpress.com/hardware/smeq/

Really small design.Boards about 5x10 cm.You can build 8 channel(even more) eq with 3U enclosure.Or you can use it with your mic preamps.I could be good with Green Pre or 9K Pre...

I added discrete op amp option.

If you're interested,tell me.Like pre-order.When i build it,you can get.

Low : 50-600Hz
Mid : 200-7000Hz
High : 10kHz

tmuikku · Apr 25, 2015

yello! is the low band shelving or bell? this is similar in funktion as my old fostex board eq that has bell as the low band. the eq is quite effective and usable. the mixer is pretty noisy consumer electronix though

is this your schemo or the original? opamp psu decoupling is missing? low cut filter would be great. might buy some to test out

ForthMonkey · Apr 25, 2015

tmuikku said:
yello! is the low band shelving or bell? this is similar in funktion as my old fostex board eq that has bell as the low band. the eq is quite effective and usable. the mixer is pretty noisy though low cut filter would be great addition.

if you sell cheap, i'll buy some

Low band is shelf.Yes low cut would be great but for now i can't build big PCBs.In the future there will be some projects with bigger PCBs.

I will sell only boards.Price about $10.

snaper · Apr 28, 2015

Looks interesting.
Will you share the etch files? (Or is it a double sided board?)

ForthMonkey · May 1, 2015

snaper said:
Looks interesting.
Will you share the etch files? (Or is it a double sided board?)

It's double sided board.So hard to self etch.

ForthMonkey · Aug 12, 2015

Updated circuit and 3D view.

ForthMonkey · Sep 2, 2015

Updated PCB design.

Humner · Sep 18, 2015

very cool, are the POT's linear or log? I suspect all are linear?

ForthMonkey · Sep 18, 2015

Humner said:
very cool, are the POT's linear or log? I suspect all are linear?

LF - 100k RevLog
LG - 10k Linear
MF - 100k RevLog
MG - 10k Linear
HG - 10k Linear

Humner · Sep 18, 2015

thanks.

its a nice small board. might consider this for the EQ section for a summing mixer I'm planning.

if I use your gerber file to make boards for my mixer, I will send money to you as designer fee - sound good?

ForthMonkey · Sep 18, 2015

Humner said:
thanks.

its a nice small board. might consider this for the EQ section for a summing mixer I'm planning.

if I use your gerber file to make boards for my mixer, I will send money to you as designer fee - sound good?

It's up to you.Feel free to use it.

ForthMonkey · Oct 17, 2015

Documents updated.

Corrected High Gain Pot placement.Humner found error.

moamps · Oct 17, 2015

Are you sure that your output balanced amp works as it should?

ForthMonkey · Oct 18, 2015

moamps said:
Are you sure that your output balanced amp works as it should?

Yes,i'm sure.

I wonder why did you ask?

moamps · Oct 18, 2015

I can't see your schematic any more (did you removed it today from your site?) so please place it here so we can discuss it.

ForthMonkey · Oct 19, 2015

moamps said:

I can't see your schematic any more (did you removed it today from your site?) so please place it here so we can discuss it.

Click to expand...

Found some error about pot's pins.When i fix them,i will share.

Now updated corrected files!

tmuikku · Oct 19, 2015

you could have true bypass with 2p2t switch? or switch a indicator led with the unused switch pole

also the psu rail coupling caps would be cool.
just trying to give some suggestions since i don't have knowledge to judge the circuit itself

ForthMonkey · Oct 19, 2015

tmuikku said:
you could have true bypass with 2p2t switch? or switch a indicator led with the unused switch pole
also the psu rail coupling caps would be cool.
just trying to give some suggestions since i don't have knowledge to judge the circuit itself

I have no idea that why i didn't add led. ;D
About coupling caps,they can be added simply to directly op amp pins.

moamps · Oct 19, 2015

ForthMonkey said:
moamps said:

I can't see your schematic any more (did you removed it today from your site?) so please place it here so we can discuss it.

Click to expand...

Now updated corrected files!

~~Please use LT spice and check your output balanced amplifier.~~

ForthMonkey · Oct 19, 2015

moamps said:
ForthMonkey said:

moamps said:

I can't see your schematic any more (did you removed it today from your site?) so please place it here so we can discuss it.

Click to expand...

Now updated corrected files!

Click to expand...

~~Please use LT spice and check your output balanced amplifier.~~

~~I forgot add 10k resistor! How did i miss it!? Thanks!~~

S.Master Eq Project (Docs added)

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