[sdiy] dual output DC-DC converters

[Seb Francis]

I've had good results using 500mA 15VAC wall warts to give +/-15VDC.  It 
works as long as you don't draw too much current (e.g. 200mA max).  Of 
course it varies from wall wart to wall wart.

But you can also get 18VAC wall warts pretty easily - then you're 
certain to get +/-15VDC from your linear reg.  (and it helps keep your 
studio warm in the winter :)

Seb


harry bissell wrote:
> Usually you are limited to more like +/-12V and half-wave at that
>
> H^) harry
>
> Seb Francis wrote:
>> Why not get +/-15V from a standard *AC* wall wart.  This can be done 
>> with a normal linear PSU circuit.
>>
>> Seb
>>
>>
>> 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
>>>
>>>
>>>
>>>   
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