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> wrote: > 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 IZ8DWF > >Received on 2022-06-19 00:00:03
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