[sdiy] Power Supply

[Graham Atkins]

Oscar,

Very few circuits using dual rail power supplies like +15V / 0 / -15V  
will be exactly balanced to take the same load current from each rail.  
With a higher load say 2A or more the design
starts to become an issue. However with the low currents you are  
drawing there won't be a problem. A split rail supply with a positive  
and negative 0.5A regulators will be more than
adequate with plenty of current in reserve.

Graham

On 11 Feb 2010, at 01:36, Oscar Salas wrote:

> Hello,
>
> I would like to power two circuits that work together , one of them  
> needs +15V/0V/-15V and consumes 33 mA per rail. The other needs +15V/ 
> 0V and consumes 57mA.
>
> My questions are: Can I feed both circuits, with the same power  
> supply, with a transformer that could feed those 90mA (33mA+57mA) of  
> the positive rail or it would be better, to use two separate power  
> supplies dedicated to each circuit? Its bad to make that a  
> transformer work asymmetrically?
>
>
>
> Thanks,
>
> Oscar.
>
>
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy