[sdiy] further wishful thinking

[Scott Gravenhorst]

"geoff james" <afas00 at bigpond.net.au> wrote:
>thanks to all who responded to previous wall wart querry.
>priced the ELPAC wmo71 and it was $US 40.
>my application was to supply power to a 180M roland key board.
>scots suggestion to try the PAIA solution seems the cheapest route.
>i had actually built a small power supply (+/- 15v), but with cct board =
>+ heat sinks + transformer it was difficult to fit inside the keyboard.
>now to prove to you that i am not an EE-----here goes.
>" is it possible from a single +15v souce to create +/- 15v."

Yes, but you need to build/obtain a "power inverter" to convert the +15V
(DC) to AC first, then you can go to +/-15V the same way you would with a
line transformer.

I wouldn't do that unless I had to work with batteries.




>regards
>geoff james
>

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