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I'm trying to learn about PLC (I know the risks), so I want to start with the simplest circuit specified in the LM1893 datasheet to use on 220v AC powerline. The transformer there doesn't have any specs, how can I choose a suitable transformer for that purpose?

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fig.7 on p.9 in the datasheet shows recommended transformers.

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Notice also that LM1893 itself is obsolete (watermark in the datasheet).

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