Looking for PSU power Xformer recomendation

Archived from groups: rec.audio.pro (More info?)

Hey all,

I am racking up a Mic pre project and need a power transformer for my
PSU. I need a 20-0-20 secondary and a 120V primary which will fit in a
1U space. What is the best type to get as to not interfering with other
electronics? It does not need to be high current as it will only supply
two mic pre's and phantom (total of around 100mA).

Thanks for the input,
Brian

Archived from groups: rec.audio.pro (More info?)

"Brian Allen" wrote ...
> I am racking up a Mic pre project and need a power transformer for my PSU.
> I need a 20-0-20 secondary and a 120V primary which will fit in a 1U
> space. What is the best type to get as to not interfering with other
> electronics? It does not need to be high current as it will only supply
> two mic pre's and phantom (total of around 100mA).

There appear to be several options available from DigiKey. Both
torrodial and "flat-pack" E/I core. With such modest power
requirements, it should be easy to find something that will fit in 1 RU .

Archived from groups: rec.audio.pro (More info?)

On Sat, 09 Oct 2004 15:28:32 GMT, Brian Allen
<brianwallen@earthlink.net> wrote:

>Hey all,
>
>I am racking up a Mic pre project and need a power transformer for my
>PSU. I need a 20-0-20 secondary and a 120V primary which will fit in a
>1U space. What is the best type to get as to not interfering with other
>electronics? It does not need to be high current as it will only supply
>two mic pre's and phantom (total of around 100mA).
>
>Thanks for the input,
>Brian

Use a toroidal transformer for low radiation.

for example:

Hammond 182F18 (2 x 18V, 0.84 A) or 182F22 (2 x 22V, 0.68A). Both are
15VA, dual secondary, 1.25 in. high by 3.2 in. diameter toroids.
http://www.hammondmfg.com/182.htm
Available from Digi-Key and Allied.

Mike T.