[sdiy] DC wallwart +/- on-board V Reg ?

[MTG]

I can echo some of what Barry said. My experience is limited, but any 
time I used a regulated DC adapter ... which ran some distance *and* was 
not further regulated ... it would bite me in the ass.  So the lesson 
for me is keep the final voltages you need inside the enclosure you are 
using for the rest of the beast.  You never know how the hell the end 
user is going to run the wires on the floor, through the microwave, past 
the PC, over the engine hood, etc.


On 3/5/2015 10:33 AM, Barry Klein wrote:
> Using a certified wallwart will be less hassle and expense if you are thinking of productizing something.
> Anything with AC mains going to it will cost you extra UL/regulatory and EMC fees.
> Other than that, having a main DC source from a wall supply to local switching converters or linears on your product is the way most things are designed nowadays.  I don't buy the complaints about noise.  Switching DC/DC converters power most things now.  You can optimize your choice of converters to address the noise issue or go linear with LDO's if you really must.
> The heat linears generate I would think would be the big negative for them.
> I would watch out for inductive spiking on connects of (long cable) DC sources though.
> Design with high voltage input converters on your product and maybe put TVSD's on the inputs for protection.  I wouldn't want to say supply +/-15V and/or +5V off a (unique) wall wart and have a removable connection right to your critical synth circuits.
>
> Barry
>
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