Hi JR,
You didn't specify AC or DC. That's ok, I'm having a two-fer-one special.
Doorbell transformers give back 24VAC
Two 12VDC batteries in series gives you 24VDC. Overkill?
Transformers from many HP printers ar between 20 to 30 VDC.
The source I use is GoodWill. In the electronics or computers section, they usually have a big box of them.
Hope this helps you out
Mike
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