Electronics > Beginners

Transformer tap switching between series and parallel

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Yes zero ripple at full load is not easy to achieve but in reality it's not like that will be absolutely required when instead very low ripple at say 2A would be expected and is a more realistic target.

A DIY linear PSU I did years ago used a LM339 for 5A and it would do that however the transformers weren't a stiff enough supply so voltage did sag some near full load. It used 2x 12V transformers manually switched for parallel and series connection to provide 15 and 30V modes although no current limiting other than what a LM339 does.

Maybe by probing yours close to the PSU is influenced by EMI where a scopes 20 MHz BW limit can help get accurate readings. Use 1x probes and some averaging too.


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