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JM
Guest
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 Posted:
Wed Nov 24, 2004 2:03 am Post subject:
Transformer Splits |
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I have a collection of Lundahl 1517 trqnwformers, designed as output
transformers.
I have always had a need to create a stagebox with microphone splits. Would
the impedances of this transformer allow me to create one parallel and two
isolated splits
http://www.lundahl.se/pdfs/datash/1517.pdf
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Simon Higgs
Guest
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| Posted:
Wed Nov 24, 2004 2:03 am Post subject:
Re: Transformer Splits |
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JM <news_group@lycos.co.uk> wrote:
| Quote: | I have a collection of Lundahl 1517 trqnwformers, designed as output
transformers.
I have always had a need to create a stagebox with microphone splits. Would
the impedances of this transformer allow me to create one parallel and two
isolated splits
http://www.lundahl.se/pdfs/datash/1517.pdf
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No. |
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Mike T.
Guest
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| Posted:
Wed Nov 24, 2004 2:03 am Post subject:
Re: Transformer Splits |
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On Tue, 23 Nov 2004 22:51:17 +0000, devnull@higgs.me.uk (Simon Higgs)
wrote:
| Quote: | JM <news_group@lycos.co.uk> wrote:
I have a collection of Lundahl 1517 trqnwformers, designed as output
transformers.
I have always had a need to create a stagebox with microphone splits. Would
the impedances of this transformer allow me to create one parallel and two
isolated splits
http://www.lundahl.se/pdfs/datash/1517.pdf
No.
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I guess I'll have to display my ignorance and ask "Why not?"
With a 600-ohm primary and two 300-ohm secondaries, each of the
isolated splits should deliver a signal 6dB down from the input. This
loss could be made up in most mic preamps.
Mike T. |
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Richard Freeman
Guest
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| Posted:
Wed Nov 24, 2004 2:03 am Post subject:
Re: Transformer Splits |
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"Simon Higgs" <devnull@higgs.me.uk> wrote in message
news:1gnq7g2.1hfa85o19gqcloN%devnull@higgs.me.uk...
| Quote: | JM <news_group@lycos.co.uk> wrote:
I have a collection of Lundahl 1517 trqnwformers, designed as output
transformers.
I have always had a need to create a stagebox with microphone splits.
Would
the impedances of this transformer allow me to create one parallel and
two
isolated splits
http://www.lundahl.se/pdfs/datash/1517.pdf
No.
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I have to disagree here they should be able to do the job.
regards
Richard Freeman |
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TimPerry
Guest
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| Posted:
Wed Nov 24, 2004 6:06 am Post subject:
Re: Transformer Splits |
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"Mike T." <miket@invalid.net> wrote in message
news:7dg7q0tiths88d7q88f110ot20e3cf97an@4ax.com...
| Quote: | On Tue, 23 Nov 2004 22:51:17 +0000, devnull@higgs.me.uk (Simon Higgs)
wrote:
JM <news_group@lycos.co.uk> wrote:
I have a collection of Lundahl 1517 trqnwformers, designed as output
transformers.
I have always had a need to create a stagebox with microphone splits.
Would
the impedances of this transformer allow me to create one parallel and
two
isolated splits
http://www.lundahl.se/pdfs/datash/1517.pdf
No.
I guess I'll have to display my ignorance and ask "Why not?"
With a 600-ohm primary and two 300-ohm secondaries, each of the
isolated splits should deliver a signal 6dB down from the input. This
loss could be made up in most mic preamps.
Mike T.
|
looks to me like you could wire this for 300 in 300 out for a 1 to 1 turns
ratio. (or 150 in 300 out for a 1:2 ratio)
as to the question: even though the transformer says its 600 ohm its actual
impedance is determaned by load placed on it and the square of the turns
ratio. (plus some other factors)
as these guys put it http://www.sowter.co.uk/faq.htm
1) WHAT IS THE "IMPEDANCE" OF A TRANSFORMER? It is really no more than a
label which can be attached to a transformer or a winding. If you measure
the impedance of the primary winding you will see the "reflected" impedance
of the load you connect to the secondary winding. "Reflected" means
multiplied by the turns ratio squared. For example if you connect a 10,000
ohm resistor to the secondary of a 1:10 step up transformer and measure the
input impedance you will measure approximately 10,000 X (0.1 squared) ohms
i.e.100 ohms. (This is only approximate because you will need to allow for
the primary inductance and the dc resistance of the windings). The impedance
"label" just gives an idea of the impedance of the circuit in which it could
be used |
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Phil Allison
Guest
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| Posted:
Wed Nov 24, 2004 2:04 pm Post subject:
Re: Transformer Splits |
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"Ralph Staub"
| Quote: | Mic splitters are generally designed to operate within a broader range of
level than a line level transformer. Line level output transformers are
optimized to function around +4dBu. There's no need to operate just as
well at -50dBu because the electronics driving them don't function well at
those levels.
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** What a load of gobbledegook.
| Quote: | That said, the Lundahl is a good transformer, and may perform fairly well
outside it's sphere of expertise.
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** The same cannot be said of the poster.
............... Phil |
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Ralph Staub
Guest
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| Posted:
Wed Nov 24, 2004 2:04 pm Post subject:
Re: Transformer Splits |
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JM wrote:
| Quote: | I have a collection of Lundahl 1517 trqnwformers, designed as output
transformers.
I have always had a need to create a stagebox with microphone splits. Would
the impedances of this transformer allow me to create one parallel and two
isolated splits
http://www.lundahl.se/pdfs/datash/1517.pdf
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If the question is "will it work" the answer is yes. If the question is
"will it work well enough" the answer is maybe. If the question is "will
it work as well as a real mic level splitter transformer" the answer is
probably not.
Mic splitters are generally designed to operate within a broader range
of level than a line level transformer. Line level output transformers
are optimized to function around +4dBu. There's no need to operate just
as well at -50dBu because the electronics driving them don't function
well at those levels. Most decent mic splitter transformers are
optimized to operate -50 to -10dBu and don't saturate until >+10dBu.
That said, the Lundahl is a good transformer, and may perform fairly
well outside it's sphere of expertise. Build 1, use it on a wide variety
of mics, particularly your low level stuff. If you don't like the
outcome, ship the remaining 1517's to me. ;-) You can't have too many
good quality line level splitter transformers in the corporate audio market.
Ralph |
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Ralph Staub
Guest
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| Posted:
Wed Nov 24, 2004 2:04 pm Post subject:
Re: Transformer Splits |
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Phil Allison wrote:
| Quote: | ** What a load of gobbledegook.
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Another highly technical post from the village idiot. |
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JM
Guest
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| Posted:
Wed Nov 24, 2004 10:07 pm Post subject:
Re: Transformer Splits |
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"Ralph Staub" <ralph@liveaudioresource.com> wrote in message
news:Ni0pd.9478$1B2.3909@trnddc02...
| Quote: | Phil Allison wrote:
** What a load of gobbledegook.
Another highly technical post from the village idiot.
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The other option may be to use op-amps to drive the tranformer. I am only
really wanting the transformers for galvanaic isolation more than having
active splits |
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Jason Lavoie
Guest
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| Posted:
Wed Nov 24, 2004 10:07 pm Post subject:
Re: Transformer Splits |
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On Wed, 24 Nov 2004 22:32:26 +1100, "Phil Allison"
<philallison@tpg.com.au> wrote:
| Quote: |
"Ralph Staub"
Mic splitters are generally designed to operate within a broader range of
level than a line level transformer. Line level output transformers are
optimized to function around +4dBu. There's no need to operate just as
well at -50dBu because the electronics driving them don't function well at
those levels.
** What a load of gobbledegook.
That said, the Lundahl is a good transformer, and may perform fairly well
outside it's sphere of expertise.
** The same cannot be said of the poster.
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welcome back phillie. haven't seen you in a while.
in the meantime we've been having intelligent, well mannered
conversations without you.
Jason |
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Phil Allison
Guest
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| Posted:
Wed Nov 24, 2004 10:07 pm Post subject:
Re: Transformer Splits |
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"Ralph Staub" <
| Quote: | Phil Allison wrote:
** What a load of gobbledegook.
Another highly technical post from the village idiot.
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** Care to explain any of your assertions Ralph??
Either in this post or the one you just snipped out of sight ?
............ Phil |
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Phil Allison
Guest
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| Posted:
Wed Nov 24, 2004 10:07 pm Post subject:
Re: Transformer Splits |
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"Jason Lavoie"
"Phil Allison"
| Quote: |
"Ralph Staub"
Mic splitters are generally designed to operate within a broader range
of
level than a line level transformer. Line level output transformers are
optimized to function around +4dBu. There's no need to operate just as
well at -50dBu because the electronics driving them don't function well
at
those levels.
** What a load of gobbledegook.
That said, the Lundahl is a good transformer, and may perform fairly
well
outside it's sphere of expertise.
** The same cannot be said of the poster.
welcome back phillie. haven't seen you in a while.
in the meantime we've been having intelligent, well mannered
conversations without you.
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** Apes in the zoo have better conversations than Canadian jerk offs like
you.
.............. Phil |
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Bob
Guest
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| Posted:
Thu Nov 25, 2004 2:03 am Post subject:
Re: Transformer Splits |
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On Thu, 25 Nov 2004 07:23:41 +1100, "Phil Allison" <philallison@tpg.com.au>
wrote:
| Quote: |
"Jason Lavoie"
"Phil Allison"
"Ralph Staub"
Mic splitters are generally designed to operate within a broader range
of
level than a line level transformer. Line level output transformers are
optimized to function around +4dBu. There's no need to operate just as
well at -50dBu because the electronics driving them don't function well
at
those levels.
** What a load of gobbledegook.
That said, the Lundahl is a good transformer, and may perform fairly
well
outside it's sphere of expertise.
** The same cannot be said of the poster.
welcome back phillie. haven't seen you in a while.
in the meantime we've been having intelligent, well mannered
conversations without you.
** Apes in the zoo have better conversations than Canadian jerk offs like
you.
............. Phil
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hey hey no reason to pick on us Canuks!! |
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Ralph Staub
Guest
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| Posted:
Thu Nov 25, 2004 10:06 am Post subject:
Re: Transformer Splits |
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Phil Allison wrote:
| Quote: |
** Care to explain any of your assertions Ralph??
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Not to you... |
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Phil Allison
Guest
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| Posted:
Thu Nov 25, 2004 2:09 pm Post subject:
Re: Transformer Splits |
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"Ralph Staub"
| Quote: | Phil Allison wrote:
** Care to explain any of your assertions Ralph??
Not to you...
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** Not to anyone in truth.
............. Phil |
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