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output trannies
output trannies
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Old 3rd April 2005, 06:35 PM   #1
flodge is offline flodge  United Kingdom
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Default 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
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Old 4th April 2005, 01:40 AM   #2
I_Forgot is offline I_Forgot  United States
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Default Here ya go

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.

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File Type: gif transformers.gif (2.9 KB, 459 views)
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Old 4th April 2005, 06:26 PM   #3
flodge is offline flodge  United Kingdom
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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

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Old 20th August 2005, 03:40 PM   #4
Pwoida is offline Pwoida  Australia
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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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Old 21st August 2005, 07:35 PM   #5
Calvin is offline Calvin  Germany
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Default Impedance transformation


with an ideal tranny the input impedance would be Z/nē 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.

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