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Author Topic: Any DIY EQ interest?  (Read 40453 times)

JPRisus

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Re: Any DIY EQ interest?
« Reply #15 on: July 11, 2004, 10:53:34 pm »

I'm very interested in this, for learning purposes mainly... been looking to get into the DIY thing for a while now but haven't taken the plunge yet. Great idea Brad!
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J.P. Sheganoski
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OTR-jkl

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Re: Any DIY EQ interest?
« Reply #16 on: July 12, 2004, 12:16:48 pm »

Sounds like lots of fun - and I sure could use the EQ...

Any rough guesses about the cost?
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J Lowes ยท OTR Mastering
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Kris

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Re: Any DIY EQ interest?
« Reply #17 on: July 12, 2004, 03:09:15 pm »

Useful and great sounding?  Sounds like fun!
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bblackwood

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Re: Any DIY EQ interest?
« Reply #18 on: July 13, 2004, 10:24:35 am »

Real quick - brutal week so little will happen this week on the EQ.

Frist, it looks like there is enough interest to do this online.

As for cost - that depends on how deep you want to go. You can build your own PSU or spend anywhere from $50 to several hundred to buy one. Every part will have multiple choices that may affect the sound or perhaps reliability. I'm guessing here, but I imagine you can build something like this for anywhere from $200 to $as-much-as-you-want-to-spend...

More to come soon.
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Brad Blackwood
euphonic masters

malice

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Re: Any DIY EQ interest?
« Reply #19 on: July 13, 2004, 11:28:25 am »

I had this address of fair designed PSU, every voltage, several different powers, quite cheap ...

I'll try to find the link


malice

doughiggins

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Re: Any DIY EQ interest?
« Reply #20 on: July 13, 2004, 02:24:38 pm »

malice wrote on Tue, 13 July 2004 08:28

I had this address of fair designed PSU, every voltage, several different powers, quite cheap ...

I'll try to find the link


malice


cool


Brad, if we can contribute in any way, let us know...maybe some of the bulk resistors/caps  or something may be advantgeous to pair up with others, and especially the chasis and screening will be good to spread custom costs across?!
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doug

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Re: Any DIY EQ interest?
« Reply #21 on: July 13, 2004, 11:40:52 pm »

Count me in!  This sounds like a great project, I've been looking for something to get my feet wet with DIY.

Damon
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ValveTone Mastering
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archtop

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Re: Any DIY EQ interest?
« Reply #22 on: July 14, 2004, 01:40:17 pm »

Me too, Me too.


I've never built anything. but I made all the snakes, and soldered 'em
to to my 4 TT patchbays (twice Sad ).
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Richard Williams

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Re: Any DIY EQ interest?
« Reply #23 on: July 14, 2004, 10:56:40 pm »

Yeah, I'm in.  Probably in lurk mode, since I doubt strongly that I'll be able to add anything to design decisions, but I'd love to follow along.

Eric H.
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Eric Honour
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dcollins

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Re: Any DIY EQ interest?
« Reply #24 on: July 15, 2004, 02:26:09 am »

TomW wrote on Sun, 11 July 2004 06:09

Quote:


I would be interested in developing this topology to make a 4-band EQ with passive low and high bands with some discrete opamp gyrators for the 2 mid bands.



Could be too complicated for this sort of DIY project.  Unless the discrete opamp only has 3 transistors!

http://www.forsselltech.com/schematics/Gyrator1.htm

Probably better to use a real inductor for this project, as everyone knows they have more "vibe."

I discussed with B-rad two ideas for something like this.  First, is a three band Baxandall with either IC or 990 size opamps.  Probably too clean for the audience.  Second, was just the old bog-standard buffer to passive 600 Ohm LCR network to make-up amp, probably fixed Q, but doesn't have to be.  Tube construction is a little more painful, but at least they can be seen with the naked eye.  PSU also costs more than with opamps.

In thinking about this, I was reminded of the old "saturable inductor" where you have in effect another input to the system.  Used in ancient de-essers. Distortion is probably off the map. Can you cobb your own from existing parts, is the question.

This might actually be unique today, so you didn't hear it from me.

We can recycle those old Western Electric circuits untill the bovine return......

DC

lucey

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Re: Any DIY EQ interest?
« Reply #25 on: July 15, 2004, 01:48:51 pm »

im interested but too busy to commit for sure.

the tech talk is over my head but a simple unit is best IMO, one notch and 2 boosts would be cool
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Brian Lucey
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jlapointe

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Re: Any DIY EQ interest?
« Reply #26 on: July 15, 2004, 02:47:49 pm »

dcollins wrote on Thu, 15 July 2004 03:26



In thinking about this, I was reminded of the old "saturable inductor" where you have in effect another input to the system.  Used in ancient de-essers. Distortion is probably off the map. Can you cobb your own from existing parts, is the question.



Please tell more! What's the premise here? A DC bias on the inductor to put it into saturation earlier?  How was it implemented as a de-esser?      

TomW

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Re: Any DIY EQ interest?
« Reply #27 on: July 19, 2004, 05:32:23 pm »

Hi DC!

I think you're right - it may be too complicated. I just figured the gyrators might make it a little more flexible and good inductors for mid ranges are hard to find as far as I know. Still gyrators would no longer be passive..........

From searching the web I only know of the pultec HF inductors from sowter and cinemag. There are cheap ones from a variety of other sources though. IIRC big inductors are needed for midrange stuff and they seem harder to find in the right values.

I think the baxandall sounds interesting - they seem very common with hifi manufacturers.

What do people think to the single amp forssell topology?

Cheers Tom  Smile
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Doug Van Sloun

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Re: Any DIY EQ interest?
« Reply #28 on: July 19, 2004, 10:27:42 pm »

Count me in too!!  Baxandall filters with 990's sounds very tasty!
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Doug Van Sloun
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theo mack

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Re: Any DIY EQ interest?
« Reply #29 on: July 19, 2004, 11:36:48 pm »

I'm in.

My wish list:

2 boost bands, 1 cut

balanced in and out.

something nice for make up gain like john hardys 24V 990
It would be nice to concentrate on the passive eq part of the circuit and have the easy plug in JH 990 24V on the back end.
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theo mack
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