[sdiy] Transformer question

[Matthew Smith]

Quoth Simon Brouwer at 24/02/11 21:49...
...
> A useful rule of thumb for regulated power supply with LM78xx and similar:
> take secondary voltage 3 volts higher than the desired output voltage.
> 2x18V is exactly right for a regulated 2x15V PSU.

I'm curious as to whether this is also the case when using LDO versions 
of the 78xx/79xx regulators.

-- 
Matthew Smith

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