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Jun 8 at 0:24 comment added Peter Bennett That schematic clearly shows a step-down transformer, despite the relative sizes of the windings. The drawing shows the primary as 117/230 V (not really possible, but probably intended to show that the power supply could be equipped with a transformer suitable for use with either common AC voltage) and secondary with taps to provide 9 and 15 VAC.
Jun 7 at 23:35 comment added StealthRT Thanks for clearing that up. Can you tell me what type of transformer they are using in the schematic on that page? The T1 3A version? eleccircuit.com/wp-content/uploads/2020/06/…
Jun 7 at 22:59 history answered Voltage Spike CC BY-SA 4.0