[sdiy] cheap BOSS dc adapter replacement?/switching noise PROBLEM?

[Tim Parkhurst]

On Mon, Jan 25, 2010 at 6:00 AM, dan snazelle <subjectivity at hotmail.com> wrote:
> This is a 2 part question. (all related to DC 9v power wallwarts)
>
> part one is this-
>
> I want to include a 9v Dc adapter with my effects that will have the Boss style 2.1 mm barrel plug and reverse polarity.
> at around 350-500 ma
>
>
>
> part two is this:
>
> i have been messing around with A circuit that when powered on ITS own by a 9v dc adapter works and sounds fine.
> BUT when it is connected (via one of those power splitters for dc adapters) to a 9v dc adapter that is being shared with a few other circuits, it suddenly starts WHINING
>
>
> any other options?
>
> thanks so much
>
>
> dan
> _______________________________________________


Hey Dan,

How about using an AC wallwart instead? They're cheap and readily
available just about anywhere. Then you need to put a rectifier,
regulator(s) and some caps on your project board and you're all set.
It keeps your customers from having to handle high voltage AC (which
is good if you're selling PCBs or kits).

As far as problem 2, sounds like there's not enough current from your
supply to run circuit C and anything else. Just a quick guess on that
one.


Tim (thought 'wallwarts' was a social disease) Servo
-- 
"Sire, the church of God is an anvil that has worn out many hammers."
- H.L. Hastings