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Diy Trafo for ESL.
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Old 23rd January 2020, 11:04 AM   #1
merovingio is offline merovingio
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Default Diy Trafo for ESL.

Hello everyone!
I would like before trying to build trafo (non-toroidal) for ESL panels.
I need any information you want to let me know.
Can you help me understand how to do it?
Thank you all.
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Old 23rd January 2020, 11:53 AM   #2
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Location: Barrio Garay,Almirante Brown, Buenos Aires, Argentina
At first you need to collect all relevant data, this is:
1.-Impedance ratio, sec to pri or vice versa.
2.- Minimum frequency to be transformer with no too important loose/distortion.
3.- The maximum size allowable.-
4.- Power amount to be transferred.-
5.- The iron quality available.-
6.- Number of windings (in case you have more than two) for, feedback, for example.

There are several approach to the final device, but imho a great work is done in the Langford-Smith's Radiotron available in the web in pdf, and a work from an Argentine professor called Ladislao Koros from whom there is no work available in the net.
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Old 23rd January 2020, 12:12 PM   #3
merovingio is offline merovingio
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Thanks! Osvaldo.
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Old 23rd January 2020, 12:46 PM   #4
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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I forgot in the above list, the input voltage, as it will define the primary turns in the windings. Sorry‼.
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Old 23rd January 2020, 12:58 PM   #5
alexberg is offline alexberg
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1. Panel capacitance
2. Frequency Response Low/High
3. Amplifier type
4. Power rating
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Old 24th January 2020, 07:51 AM   #6
merovingio is offline merovingio
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Thanks all!
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Old 24th January 2020, 09:36 AM   #7
golfnut is offline golfnut  New Zealand
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Key parameters are

ESL capacitance (lower much better, favours segmented designs)
amplifier OP voltage
low frequency cutoff
voltage step up ratio
amplifier/speaker lead OP inductance and resistance (much lower better)

see previous discussion at
esl transformer.
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Old 27th January 2020, 08:04 AM   #8
merovingio is offline merovingio
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Thanks golfnut.
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