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Help with isolation transformer

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milanino

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What is the reference of the transformer in this circuit?
and can i remplace it with another circuit without using a transformer ?
help me please
lm1893.png
 

chuckey

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See TI application sheet p.9 https://www.ti.com/lit/ds/snas544a/snas544a.pdf As i said its a resonent ferrite based transformer.
Frank

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See TI application sheet p.9 http://www.ti.com/lit/ds/snas544a/snas544a.pdf As i said its a resonent ferrite based transformer.
Frank
 

Audioguru

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The datasheet for the obsolete old IC says to use a Toko transformer that is also obsolete.

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The datasheet for the obsolete old IC says to use a Toko transformer that is also obsolete.

EDIT: When I press "Post Reply" then nothing happens. Why?
Then after a minute my reply is doubled. Why?
 

chuckey

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You could try using a pulse isolation transformer, this would give give you your isolation, it could also do some impedance matching(~ 10:1 required). This would have to have a high pass filter as well with a pass band tuned to your carrier frequency (which you do not give)
Frank
 

milanino

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How to do that M.chuckey ??
have you schematic to do it . i need to replace the transformer with another device but i haven't found
 

milanino

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50Hz for the carrier and 125khz for the lm1893
 

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