On Sat, Jun 18, 2022 at 5:42 PM <tokafondo_at_tokafondo.name> wrote: > > TI's version of the LM317T's datasheet has something interesting to see in its page 15. > > It can be seen only in TI's datasheet, and not others AFAIK. > > They show how to use two LM317T IC in a way that from a 12VAC source, take it down to 6VAC. I'm sure that with changing the values of the resistors needed, 9VAC can be got, instead of the 6VAC of the example. it is actually AC in the sense that there will be alternating polarity voltages, however that circuit will clamp the waveform voltage to 9V (or whatever you chose) as long as the input voltage is greater than the set voltage. So you'll get a kind of "flat-top" waveform. I'd say it's not ideal (it adds high frequency harmonics, both LM317 need to be heatsinked...) I have never had any difficulty in finding 9VAC transformers. Frank IZ8DWFReceived on 2022-06-18 21:00:10
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