hi, why should exactly to put 9 volt bat.in a series to turn on the hv rectifier ? , it 's my first time to watch the trouble-shooting of a micro oven , well done ! thank you for the article. w/ best Ruben

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I recently got an confirming answer from Paris Azis (our Transformer Expert!) involving the idea of placing two of these European High Power 4KV Microwave Transformers in anti-serie connected HV to HV, which gives us a very cheap high power Safety Transformer 110V/230V AC in- and output. Ideal for experiments on the to the AC Mains connected Devices. Of course with the HV Fuses still connected too. And I was however told not to use the 10 Amps low voltage Microwave Filament coils.
I haven't tested this yet because I now only have one Big Transformer. But that is why I keep any disgarded Microwave Transformer I do get. These Safety Transformers aren't exactly cheap normally and after all Safety above all ! And the 1200 Watt, or so, of Power makes a great Tool for our electronics Lab when this works.

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PS: according to an answer I got from Paris Azis, it is possible to make a dirtcheap AC isolation Transformer with 2 disgarded Microwave Transformers. By simply connecting the HV outputs together. Which creates a very cheap High Power safety Transformer for testing 110/230 Volt AC powered devices. I haven't tested this yet. Because I now only have one Transformer.

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Okay, that probably also explains the different looking Transformer that looks more like a TV Transformer. Our EU Transformers produce about 4KV without any Doubler circuit. I thank you for the information.

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The high voltage circuitry after the HV transformer is a HV doubler circuitry. The working principle is the same with some variation in the design from different manufacturers.

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