9VAC transformers are commonly available brand new in plug-packs (wall-warts) or as individual components from most electronics suppliers. On 19/06/2022 5:17 am, tokafondo_at_tokafondo.name wrote: > I will only say that this is an actual Commodore (and retro computers) > desert. And most 9V adapters I've ever seen are from xDSL routers, AP > and modems, long ago discarded. > > > > 18 de junio de 2022 22:12, "Mike Stein" <mhs.stein_at_gmail.com > <mailto:mhs.stein_at_gmail.com?to=%22Mike%20Stein%22%20<mhs.stein@gmail.com>>> > escribió: > > Well, he's in Spain and you're in Italy; maybe you treasure the > old traditional ways more than he ;-) > I don't know offhand how constant the 9V load of a C64 is but I > would think that a carefully selected resistor with maybe a couple > of Zeners to clamp any overvoltage might do the trick. > m > On Sat, Jun 18, 2022 at 2:27 PM Francesco Messineo > <francesco.messineo_at_gmail.com > <mailto:francesco.messineo_at_gmail.com>> wrote: > > On Sat, Jun 18, 2022 at 5:42 PM <tokafondo_at_tokafondo.name > <mailto: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 IZ8DWF > > >Received on 2022-06-19 04:00:07
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