Power adapters....

Zombienosh

So I went into Waltons the other day to buy a BOSS PSA 230, they had none, they had some other imitation brand 230's ok i said, A Power supply is a power supply?! right?
nope, Aweful AC buzz coming through this one, it seems to interfere with the 16v pedal in the chain of otherwise 9v, the real Boss adapters dont create the hum, just this one.

Owen

Sure it's the adapter? I mean there's not much inside step down transformers, a primary coil, a ferrite core, and a secondary coil, and that's about it. Maybe it's a fault in one of the pedals if it's rain on a DC adapter rather than batteries?

RC88

did u check if the cable/pedal Polarity is negative or positive centre,look it up on the net to see if the voltage matches as well you said the pedal is 16v while the cable is prob 9v

Zombienosh

I have a seperate adapter for the one 16v pedal, And the buzz only occured when using the cheaper 9v adapter

Owen

When you say the buzz only happened using the cheaper 9v adapter, have you tried a different one, or are you comparing it to batteries? If the latter, you should attempt to power up the pedals one at a time using the 'cheaper' 9v adapter and see which one is causing the problems.

I'd be willing to bet it's more of a grounding issue between the DC input jack on one pedal than it is with the adapter. There's literally nothing inside those adapters to go wrong, they're about as simple as things get.

eoin5

If its a really crappy one just designed to make the lights come on it might be unregulated, that could cause noise alright.

Owen

Do they still make unregulated ones? A 780x regulator these days is pence!

Zombienosh

I'm comparing the no name 9v 230 adapter to a standard BOSS adapter.

eoin5

PaintDoctor wrote: »

Do they still make unregulated ones? A 780x regulator these days is pence!

Yea I've seen unregulated cheap adjustable ones around the place, its unlikely to be the case for a PSA clone but stranger things have happened.

68 lost souls

Could be. A lot of cheap power supplis cause buzz. Thats why you pay so much for a good power supply. Music and speakers are very sensitive in nature and the very small differences will make things buzz.