[sdiy] further wishful thinking

[simon.oo.o at xs4all.nl]

Hi Geoff,

geoff james zei:
> 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."
> regards
> geoff james

Yes.
Of course you already have +15V; you can make the -15V with an inverting
DC-DC converter.

For example one using the MAX776:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1177/ln/


Vriendelijke groet,

Simon Brouwer
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