SV: Re: SV: RE: [sdiy] Multiple Voltage Power Supply / design problem!

[Seb Francis]

If you wanted to do things the linear way then just a normal 15V AC 
wallwart will give you +/-15V DC.

Simpler maybe, but definitely not more efficient.  I know switching 
power supply is a bit of a dirty word on this list, but actually there 
is a lot of decent studio equipment around nowadays that uses them (all 
the latest Mackie mixing desks for example).  And if you can run a 
super-quiet mixing desk from a switcher then it's not going to be a 
problem to run an analog synth...

Perhaps from a DIY perspective it easier(=simpler) to just go linear and 
pay for the extra heatsinks and bigger transformer, but on the 
commercial side of things (especially when catering for different mains 
voltages) there are good reasons to go the other way.

Seb


karl dalen wrote:
> Hmm, a charge pump, i wonder wouldn't a tiny 12V 1:1 transformer
> with two secondary's feed by a 12V AC wall wart on single primary
> be simpler and more efficient?
>
> Alltought i have never seen such a transformer as a standard item from a 
> component supplier.I suspect that those transformers are customer winded only.
>
> KD