Homebrew PCBs

On 1/13/2016 10:39 AM, john_chortomaris@... [Homebrew_PCBs] wrote:
>
> Hi all,
>
>    could any member in this forum to design portable dc/dc power 
> supply  with +/- 6v +/-12v voltage?
>
>
> 
> ------------------------------------------------------------------------
> Posted by: john_chortomaris@...
Hello, John--

You might want to expand your description of the power supply's 
requirements. For instance...

--Required output current for both outputs, including cross-output 
regulation.
--Output voltage noise and startup transient specifications. (Linear or 
switched-mode supplies produce different amounts of noise and ripple.)
--Are there any startup consideration (i.e., does it matter if the 
12-volt output reaches full voltage before the 6-volt output does?).
--Are  the common connections for the power outputs tied together?
--Are there any EMI requirements? (I.E., radiated electromagnetic 
interference)

Now for the input side:

--Input voltage variation range (i.e., what's the power source, and how 
are its voltage and current delivery capabilities)?
--What back-fed noise does the power supply deliver, and how would this 
affect other devices connected to the power source?

Packaging:

--What environment will the power supply encounter? (i.e., extremes of 
temperature, humidity, dust, shock and vibration)
--How much space is available for the power supply?
--How does the power supply dissipate heat produced in normal operation? 
How does the power supply receive cooling (or heating)?
--How does the power supply attach to whatever it's powering?

There are other considerations, but those I've outlined above are a 
pretty good starting point. That said,
you may wind up with a commercial +/-15-volt module and  four 
fixed-output linear regulator ICs to produce
the lower-voltage outputs.

73--

Brad  AA1IP