output trannies

flodge · 3rd April 2005, 05:35 PM

Hi I am a little confused about the arrangement for using two audio trannies. The sowter website says to ground the centre tap which is surely the bias connection. Is the problem that there is lack of clarity over the secondary and primary labelling. I suppose that a tranny designed for esl's might be labelled differently

I_Forgot · 4th April 2005, 12:40 AM

With two transformers, whether or not they have center taps, you wire as shown. The primaries can be connected in series or parallel, whichever works best for your transformers and ESL panels.

I_F

flodge · 4th April 2005, 05:26 PM

many thanks indeed
I have googled and found references to the concept and had worked out a possible connection in my head but the sowter web site threw me. Cheers for going to the effort of posting a schematic

Steve

Pwoida · 20th August 2005, 02:40 PM

In the lower picture posted above by I_Forgot, if an impedance of Z ohms is connected between stators A and B and each of the transformers has a turns ratio of 1:n what would the input impedance be (ie Z referred to the input) ?

Calvin · 21st August 2005, 06:35 PM

Hi,

with an ideal tranny the input impedance would be Z/n² with n depending on the connection of the primaries.
series connected primaries.....factor 1:n
parallel connected primaries...factor 1:2n
So parallel connection gives double the output voltage of series connected primaries, but the input impedance is 1/4th of it.

jauu
Calvin

3rd April 2005, 05:35 PM	#1
flodge diyAudio Member Join Date: Mar 2005 Location: Brighton	output trannies Hi I am a little confused about the arrangement for using two audio trannies. The sowter website says to ground the centre tap which is surely the bias connection. Is the problem that there is lack of clarity over the secondary and primary labelling. I suppose that a tranny designed for esl's might be labelled differently

21st August 2005, 06:35 PM	#5
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	Impedance transformation Hi, with an ideal tranny the input impedance would be Z/n² with n depending on the connection of the primaries. series connected primaries.....factor 1:n parallel connected primaries...factor 1:2n So parallel connection gives double the output voltage of series connected primaries, but the input impedance is 1/4th of it. jauu Calvin

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4th April 2005, 05:26 PM	#3
flodge diyAudio Member Join Date: Mar 2005 Location: Brighton	many thanks indeed I have googled and found references to the concept and had worked out a possible connection in my head but the sowter web site threw me. Cheers for going to the effort of posting a schematic Steve

20th August 2005, 02:40 PM	#4
Pwoida diyAudio Member Join Date: Aug 2005	In the lower picture posted above by I_Forgot, if an impedance of Z ohms is connected between stators A and B and each of the transformers has a turns ratio of 1:n what would the input impedance be (ie Z referred to the input) ?

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