oragall

Re: Bo Hansén DI layout
« Reply #120 on: May 04, 2010, 05:38:10 PM »
i have a edcor pc 1/4W  series (600 to 15K) , the relation of this trafo is 1:5 , work well,  ot not with this trafo.????


Bo Hansen

Re: Bo Hansén DI layout
« Reply #121 on: May 04, 2010, 09:29:17 PM »
oragall,

Not the best impedance match, but try it, you newer know, maybe it will work fairly good.

--Bo
« Last Edit: May 06, 2010, 03:37:39 PM by Bo Hansén »
I met a man with a dollar, we exchanged dollars, I still had a dollar.
I met a man with an idea, we exchanged ideas, now we each had two ideas.

Soeren_DK

Re: Bo Hansén DI layout
« Reply #122 on: May 06, 2010, 03:10:56 PM »
NEWS FLASH
The boards is now available in gustavs shop :) :) :) :) :) :) :)
http://www.groupdiy.com/index.php?topic=10776.0

Cheers
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

[silent:arts]

Re: Bo Hansén DI layout
« Reply #123 on: May 06, 2010, 04:05:15 PM »
I think I need to place an order tomorrow.
to Gustav and Haufe  8)

oragall

Re: Bo Hansén DI layout
« Reply #124 on: May 06, 2010, 08:32:59 PM »
tnx bo, maybe y test whit the trafo. Need only time, but now i finish other project.

sonolink

Re: Bo Hansén DI layout
« Reply #125 on: May 07, 2010, 09:25:48 AM »
I'd like to have a go at self-etching this board. Any chance the final PCB version could be posted, please?
Cheers
Why sleep when you can mix?
M.P.Stavrou

juanjovincenzo

Re: Bo Hansén DI layout
« Reply #126 on: May 07, 2010, 12:53:43 PM »
Hi Guys!!

I would like self-etch my own PCBs too.  ;D

If it is possible, please, post the Final copper side layout and the silk side. ;)

Thanks for this thread and best regards
mucha suerte y chao

Juanjo..
Recorder and Mixer

briomusic

Re: Bo Hansén DI layout
« Reply #127 on: May 10, 2010, 05:12:15 AM »
Between Christmas/New Year I will try to do a transformer test/evaluation and compare Lundahl, Haufe and OEP in the DI-Box electronics.

But Just now I wait for a sample of OEP A262A3E from UK, so I will start when I receive that.

--Bo

Hi Bo,
did you ever get round to comparing the sound of these transformers in your circuit?
Would be very interested in hearing (or hearing about) results as these transformers are quite different in price etc.
Thanks,
briomusic


pacemaker

Re: Bo Hansén DI layout
« Reply #128 on: May 10, 2010, 09:02:15 AM »
yes i agree,
seems that a lot of people like the OEP in this build
Cinemag too,
But your impression with Lunhdal and Jensen would be interesting
Also with Edcor, Altran ....

sonolink

Re: Bo Hansén DI layout
« Reply #129 on: May 10, 2010, 10:15:42 AM »
I'd like to have a go at self-etching this board. Any chance the final PCB version could be posted, please?
Cheers


I guess that's a no no then, right?
Why sleep when you can mix?
M.P.Stavrou


Soeren_DK

Re: Bo Hansén DI layout
« Reply #130 on: May 11, 2010, 04:48:21 AM »
I'd like to have a go at self-etching this board. Any chance the final PCB version could be posted, please?
Cheers


I guess that's a no no then, right?
Sorry guys. I didn't got so much time but I have done it now. Its in the first post..

Best regards
Soren
Quote from: idylldon
...it works like a champ and is as quiet as a mouse pissing on a cotton ball.

http://www.soundcloud.com/doctorsclub

sonolink

Re: Bo Hansén DI layout
« Reply #131 on: May 11, 2010, 05:01:00 AM »
Thanks Soren. Ur my hero  ;D
Why sleep when you can mix?
M.P.Stavrou

juanjovincenzo

Re: Bo Hansén DI layout
« Reply #132 on: May 11, 2010, 09:02:15 AM »
Hi!!
Thanks again Soren!!!!
"ESA ES!!!!"
BEST REGARDS
Y SUERTE

Recorder and Mixer

Bo Hansen

Re: Bo Hansén DI layout
« Reply #133 on: May 11, 2010, 03:36:44 PM »
briomusic,

Yes, I have done some tests and compare Lundahl LL1538, Haufe ST8456 and Walters OEP A262A3E, in my DI-box circuit.

Lundahl and Haufe have near same behavior from 100 Hz and up, but Haufe are a bit better in low end small signal distortion, and Lundahl have lower distortion in low end near saturation point.

Both have a very good square wave response, and have 14 dB loss with 1 kohm total load.

OEP have approx. 10 times higher distortion from 100 Hz and down, and have also higher distortion in the high end, but have ok square wave response, slightly rounded, with out ringing or overshoot.
Because the 6,45:1 ratio, it have 16 dB loss.

All three sounds nice in my DI-box, but Lundahl LL1538 are still the best with a steady and clean low bottom and a fast and clear high end.

--Bo

« Last Edit: May 11, 2010, 07:53:15 PM by Bo Hansén »
I met a man with a dollar, we exchanged dollars, I still had a dollar.
I met a man with an idea, we exchanged ideas, now we each had two ideas.

briomusic

Re: Bo Hansén DI layout
« Reply #134 on: May 11, 2010, 03:48:27 PM »
bo

I am sure I am speaking for many forum members in thanking you for this run down!
can't wait to build your DI now!

briomusic

neodyms

Re: Bo Hansén DI layout
« Reply #135 on: May 12, 2010, 01:33:28 PM »
Hi Bo
your impression with Haufe, OEP and Lunhdal
are very interesting,
did you tested the DI with Jensen, Cinemag or Edcor
as pacemaker asked ?

Bo Hansen

Re: Bo Hansén DI layout
« Reply #136 on: May 12, 2010, 02:43:18 PM »
neoyms,

Of course mike transformers as Jensen JT-13K7A and Cinemag CMMI-5C are great transformers, (maybe a bit low impedance on secundary) I have not test them in this DI-circuit, but I´m sure they will work very nice.

Cinemag have some other types as CMO-5/200, CM-2461NiCo, CM-24110 and CMMI-7C, and can maybe also fit very well in this circuit.

About Edcor,
Yes, I have test MX-5, 1:5 mike transformer.
Sorry to say, not so good, maybe it can be usable in other applications, but not for a DI-box like mine.

There are other usable brands and types that you can try:
Sowter 3195, 3678, 4935, 8230
Steven & Billington 829
Amplimo TM2P

And of course the old famous Neve mike transformer
10468 / VT22670 / T1454, (configurated 4,8K to 300 ohm)
to day made by Carnhill, type VTB9045, or Sowter 9145.

--Bo
« Last Edit: May 12, 2010, 03:21:12 PM by Bo Hansén »
I met a man with a dollar, we exchanged dollars, I still had a dollar.
I met a man with an idea, we exchanged ideas, now we each had two ideas.

pacemaker

Re: Bo Hansén DI layout
« Reply #137 on: May 13, 2010, 07:30:41 AM »
What about the Cinemag  CM-DBX
does anybody has tested it in this circuit ?
i suppose we can use a lot of transformer brands
in order to "color" the sound
or neutrality transparency
Seems like Rotation says the OEP is a bit raw and has a nice color
I suppose Lundahl are kind of "HI-FI" and appreciated by Bo,
Francois

Re: Bo Hansén DI layout
« Reply #138 on: May 14, 2010, 02:40:35 AM »
hey Guys,

i have a lundahl ll1530 - could this work ok in this circuit?
it is a 1+1: 3,5+3,5 mic transformer which can be wired 1:7

i'm guessing that apart from a steeper level drop it should perform ok?



Re: Bo Hansén DI layout
« Reply #139 on: May 14, 2010, 03:05:51 AM »
So which Tranny are you Americans using? All the recommended ones are European companies.


 

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