I understand very cheap transformers can be obtained to do this job. Im wondering if there is a way to fab up a circuit board power supply to do this electronically so no current is wasted like there is on a transformer.
I would need 10va ~ 20va max.
No circuit or power transformation solution is 100% efficient, there is loss in every method available to do this so why spend more for something electronic based that could fail, will generate heat, etc when a simple, low-cost transformer will do the job?
Quoted from bobukcat:No circuit or power transformation solution is 100% efficient, there is loss in every method available to do this so why spend more for something electronic based that could fail, will generate heat, etc when a simple, low-cost transformer will do the job?
Additionally, the transformer is lower loss than those other methods would be. The only downside to a transformer that I can think of is that fluctuations in the input level will show up in your output. If the output doesn't need to be a rock solid 24VAC, the transformer is the best method, IMO.
You can refer to this as a doorbell transformer. They are very common and available in many places. The loss in a transformer like this is negligible. Here is one example available at Lowes:
https://www.lowes.com/pd/Utilitech-Doorbell-Transformer/3482857
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Olympia, WA