Making Some Eqs

Bang · 19th February 2004

I really like the eq on the Midas Venice stuff. How hard would it be to make a powered 8 channel eq based on the circuit? Anyone have the schematic? What about the eq on the Ghost which is pretty cool. I would love to make some eqs, anyone know of some good schematics or DIY projects for such? Maybe some Trident Eq schematic or something?
Steve
www.blacklinerock.com
www.bangrecording.com

volki · 20th February 2004

check these links, they should keep you busy for a while

http://www.gyraf.dk/

http://recording.org/users/kev/index.htm

Ethan Winer · 20th February 2004

Steve,

> I would love to make some eqs, anyone know of some good schematics or DIY projects for such? <

There are several articles on my web site that have schematics of EQ and filter circuits, including a very nice yet simple and flexible parametric EQ. Go here:

www.ethanwiner.com/articles.html

Then scroll about a third of the way down the list to the DIY section.

--Ethan

shikawkee · 23rd February 2004

I'm designing/building an EQ unit with a buddy of mine. I'll post the results when we're through if anyone's interested.

volki · 2nd March 2004

sure, go for it. what kind of desgn is it?

shikawkee · 3rd March 2004

Quote:

Originally posted by volki
sure, go for it. what kind of desgn is it?

Well, it's compact little box, about 12" x 5". It was designed with dual use in mind; studio and as possibly part of a live guitar/bass rig. I've always been frustrated by dearth of practical, hi-fi gear to the performing musician that was also affordable. It has 1/4" balanced TRS in and out, both transformer-coupled. (This also allows TS in and out as well.) There is boost and cut at 90hrz from +16db to -16db, cut only at 220hrz, 400hrz and 1.5khrz from -3 to -16db and a high shelf with -6db cut at 10khrz. All class A, discrete, point-to-point. We tried to make the Q's as musical as possible since they have to be fixed. It being balanced TRS you can also easily patch it into a 1/4" bay. Oh yeah, and it comes with a custom +36 power supply.

Robert Derby of Valvotronics developed it with me since I found his excellent DI box two years ago. It is meant for retail with a street price of about $495.00 but not more. I get the prototype this week for testing so I may be missing one thing or two. Robert hinted that custom boxes with other, different freqs. could be possible too since he's doing each box by hand. I'll post some pics when I can.

volki · 3rd March 2004

lots of bands with cut only... actually doesn't make sense to me

what's the idea behind it?

shikawkee · 3rd March 2004

Quote:

Originally posted by volki
lots of bands with cut only... actually doesn't make sense to me

what's the idea behind it?

Hi-fi. We could keep it class-A, discrete that way and frankly it sounds better. We don't expect it's for everybody, just those who know what they want. YMMV.

shikawkee · 4th March 2004

P.S.-With our box if you don't want to use a certain frequency you simply flip a toggle switch and it's out of circuit.

shikawkee · 5th March 2004

Okay, I got the prototype today and we had to make a few changes. Maybe even a few more to come before market:

It's got a low cut of -3db at 88hrz as well as a seprate control for bass boost at 88hrz if desired. You can also click both on for an interesting curve. There is cut from -3db to-16db at 200hrz and 400hrz and both have an on/off toggle switch as well. There is also the same cut available at a choice of 1.6khrz or 2.7khrz (switched). The high cut filter is centered around 10khrz at -6db when engaged. It has the same +36 power supply and the unit is very quiet, has very low distortion and sounds great. The LED's make a pinkish light that if one or the other voltages is bad they will light up red or blue entirely. The filters are toroid coil-cap and resistor. I'll try to post some pics (it ain't pretty right now) and results later when I get a chance to take it around the block a few times.

shikawkee · 6th March 2004

I think we might be making one more change before its done. Bob Olhsson suggested making the 400hrz switchable to 800hrz as an option. Sounds like a good idea.

We're almost there....

shikawkee · 6th March 2004

One more update (like anyone cares...):

After some testing we're gonna' drop the low cut down to -3db at 70hrz and have these freq. groups as options, all switchable, on or off (still from -3 to -16db cut on each freq.)-

Either 200 or 400hrz

Either 600 or 800hrz

and

Either 1.6 or 2.7khrz

High cut still -6db at 10k and low boost to +16db at 88hrz

Transformers are handwound and custom made.

shikawkee · 8th March 2004

Final plan is to have -2db cut on each freq. to start rather than -3db. Each freq. will have on or off. High cut will now have a choice of 8k or 10k at -6db. Low cut will be -6db at 70hrz.

It's musical as all get-out on a direct signal.
Tried it in channel with some mics on an amp yesterday
and it was sweet. Getting closer...

19th February 2004	#1
Bang Lives for gear Joined: Aug 2003 Posts: 2,701 Thread Starter	Making Some Eqs I really like the eq on the Midas Venice stuff. How hard would it be to make a powered 8 channel eq based on the circuit? Anyone have the schematic? What about the eq on the Ghost which is pretty cool. I would love to make some eqs, anyone know of some good schematics or DIY projects for such? Maybe some Trident Eq schematic or something? Steve www.blacklinerock.com www.bangrecording.com

20th February 2004	#3
Ethan Winer Gear Guru Joined: Oct 2002 Location: New Milford, CT, USA Posts: 12,334	Re: Making Some Eqs Steve, > I would love to make some eqs, anyone know of some good schematics or DIY projects for such? < There are several articles on my web site that have schematics of EQ and filter circuits, including a very nice yet simple and flexible parametric EQ. Go here: www.ethanwiner.com/articles.html Then scroll about a third of the way down the list to the DIY section. --Ethan __________________ Ethan's audio book is now available!

23rd February 2004	#4
shikawkee Lives for gear Joined: Oct 2003 Location: Nashville, TN Posts: 1,010	I'm designing/building an EQ unit with a buddy of mine. I'll post the results when we're through if anyone's interested. __________________ "Lend me some sugar, I am your neighbor"- Andre 3000

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread starter	Forum	Replies	Last Post
making some choices on new high end gear to fill in some gaps in my setup..ideas??	ToneAddiction	So much gear, so little time!	16	12th May 2011 06:05 PM
gonna make some new cables...recommend me some materials please?	Patrick5150	Low End Theory	46	20th April 2009 11:06 PM
What makes some EQs better for tracking and some for mixing?	TEMAS	High end	2	27th June 2006 04:25 AM
E-Musicians - Make some cash by submitting your music!	concentric	The Good News Channel	4	9th March 2004 04:45 PM

20th February 2004	#2
volki Gear Head Joined: Jan 2004 Location: berlin, germany Posts: 69	check these links, they should keep you busy for a while http://www.gyraf.dk/ http://recording.org/users/kev/index.htm

2nd March 2004	#5
volki Gear Head Joined: Jan 2004 Location: berlin, germany Posts: 69	sure, go for it. what kind of desgn is it?

3rd March 2004	#7
volki Gear Head Joined: Jan 2004 Location: berlin, germany Posts: 69	lots of bands with cut only... actually doesn't make sense to me what's the idea behind it?

4th March 2004	#9
shikawkee Lives for gear Joined: Oct 2003 Location: Nashville, TN Posts: 1,010	P.S.-With our box if you don't want to use a certain frequency you simply flip a toggle switch and it's out of circuit.

5th March 2004	#10
shikawkee Lives for gear Joined: Oct 2003 Location: Nashville, TN Posts: 1,010	Okay, I got the prototype today and we had to make a few changes. Maybe even a few more to come before market: It's got a low cut of -3db at 88hrz as well as a seprate control for bass boost at 88hrz if desired. You can also click both on for an interesting curve. There is cut from -3db to-16db at 200hrz and 400hrz and both have an on/off toggle switch as well. There is also the same cut available at a choice of 1.6khrz or 2.7khrz (switched). The high cut filter is centered around 10khrz at -6db when engaged. It has the same +36 power supply and the unit is very quiet, has very low distortion and sounds great. The LED's make a pinkish light that if one or the other voltages is bad they will light up red or blue entirely. The filters are toroid coil-cap and resistor. I'll try to post some pics (it ain't pretty right now) and results later when I get a chance to take it around the block a few times.

6th March 2004	#11
shikawkee Lives for gear Joined: Oct 2003 Location: Nashville, TN Posts: 1,010	I think we might be making one more change before its done. Bob Olhsson suggested making the 400hrz switchable to 800hrz as an option. Sounds like a good idea. We're almost there....

8th March 2004	#13
shikawkee Lives for gear Joined: Oct 2003 Location: Nashville, TN Posts: 1,010	Final plan is to have -2db cut on each freq. to start rather than -3db. Each freq. will have on or off. High cut will now have a choice of 8k or 10k at -6db. Low cut will be -6db at 70hrz. It's musical as all get-out on a direct signal. Tried it in channel with some mics on an amp yesterday and it was sweet. Getting closer...