[sdiy] dual output DC-DC converters

[Nicholas Gregorich]

 I'm actually using the Powertrends single supplies at work, they are quite reliable from what I've seen.  They sure beat laying out a board with a switching regulator and its related components.  I am using them in a mostly digital environment with some audio.  I am having a problem with noise, but it seems unrelated to the PT regulators as the bench supply is no better.

I have two of the +/- 12V 500mA supplies sitting on my desk to use with a diff amp but I haven't gotten around to trying them yet.

What is the best way to measure the noise levels of these supplies?  I've tried unsuccessully with a scope comparing the PT and bench supply.  I see the same environment noise on both supplies.

Nick.

On Friday, April 21, 2006, at 06:03PM, mark verbos <mverbos at earthlink.net> wrote:

>Tim,
>
>I haven't seen those, but I did mention a similar product from Power 
>Trends a couple months ago. Buchla is using the PT6202 and PT5062 inside 
>  his 2 unit cases. I have heard he uses something like this in the big 
>200e cases as well. It's nice to have a little board to translate your 
>wallwart output into something usable. Especially nice for portable, 
>"live", synths.
>
>Mark
>
>
>
>
>
>Tim Parkhurst wrote:
>> Has anybody played with these? Although they are a little pricey, they
>> seem to be a nice, compact solution for getting +/-15V from a standard
>> DC wall wart...
>> 
>>>>From the latest Mouser catalog:
>> 
>> 580-NMH0515DC (2 Watts)        5V at 1A in    +/-15V at 67mA out          $14.73
>> 
>> 580-NDTD2415  (3 Watts)         24V at .125A in   +/-15V at 100mA out         $17.80
>> 
>> 580-HPR711  (5 Watts)              12V at .42A in   +/-15V@ 167mA out        $27.68
>> 
>> 580-WP06R12D15N  (6 Watts)   12V at .5A in    +/-15V@ 167mA out        $30.46
>> 
>> 580-WPN20R12D15  (20 Watts)  12V at 1.67A in    +/-15V@ 670mA out        $40.27
>> 
>> There are all sorts of combinations of input voltages (5, 12, 15, 24
>> or 48V) and +/-12VDC outputs are available too. Most of these are
>> available in DIP and SMT versions. I would think the 3 Watt version
>> would power two or three modules (or more). Just remember that the
>> wall wart has to have enough current to run the whole mess. The input
>> current rating I got from the rated power/voltage (Ohm's Law for
>> current: I = W/V). I'm assuming they're tiny switchers, but most say
>> they're shielded. Any comments? Has anybody actually used these?
>> 
>> 
>> Tim (running on 3 Watts) Servo
>> --
>> "Imagination is more important than knowledge." - Albert Einstein
>> 
>> 
>
>