[sdiy] Re: compact solutions for power supplies?

[Danjel van Tijn]

Here is a solution using a charge pump to get +9 and -9 from one 9vdc
source:  http://www.geofex.com/circuits/+9_to_-9.htm

This supply would apprently be very noisy (not ideal for audio)



On 3/19/06, Danjel van Tijn <syntheticdan at gmail.com> wrote:
>
> I build a lot of small fx and discrete synth modules. It has become
> apprent that I should start using some sort of host architecture (e.g.
> frac racks etc.) in order to elliminate redundant hardware like powere
> supplies. This would also allow for flexibilty and modularity (hoorah for
> modular synths and fx)
>
> However, there are still several devices I am building that I  would like
> to keep as discrete BUT small devices. If the power required is +/-12V I
> would typically use a center tapped transformer  (linear power supply). But
> this creates the probelm of increasing size and the possibility of induced
> hum.  If I want to use a wal-wart instead, I would be able to keep the
> transformer out of the device, but the wal-wart would not have a CT.
>
> Can I make a +12-0-12 power supply using an ACin AC out wal wart?
>
>
> thanks,
>      Danjel
>
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