GUITAR BOARD

Anyone out there got any ideas about a hum problem I have with one of my
effects pedals?

After years of using a Ross-branded PSU (yes, I know, but it worked and it
was quiet) to power my Boss fx pedals, I decided to get a proper unit
before the inevitable happened. Having looked around, I decided that a Korg
KA189 unit sounded ideal, having the correct polarity and twice the milliamp
rating of the equivalent Boss unit. The two look more or less idential, in
fact.

So, I connected the new PSU to my pedal-board and everything powered up as
normal, except for what sounded like a mains hum which I traced to the DD2
pedal. Strange. Much less of a problem when powered and used in isolation,
but still audible.

For the record, ahead of the DD2 I use: OD1, CS2, CE2 and GE7 Boss pedals.

So, is the DD2 particularly picky about PSUs?

Thanks,
RM

Roger Moss wrote:

I probably dont have the nouse to explain this, but I dont understand
what PSU you have - is it an individual one for the DD2, or a power
block with lots of mains leads coming from it, or a PSU with a daisy chain?

Personally I use the one from this website, it is superb for me, and
very good value
http://www.johnnyshredfreak.com/store/index.php?main page=product
info&cPath=8&products id=12&zenid

On May 7, 3:24 pm, Roger Moss
wrote:

I have a similar problem on my pedalboard. Ive got a fairly generic
wallwart and Ive connected it to the pedals with a Rockinger six-way
extension. Now, I usually have the following

Tuner -> Guyatone Compressor -> Vox Distortion(90s) -> UKMG Ibanez
delay -> Nobel Tremolo

The problem is, if I connect up the compressor to the mains unit, I
get massive hum. If I just leave that pedal running on battery,
everythings OK.

As far as I can see its the same polarity as the other units.

Roger Moss wrote in message
news:84iUj.3233$nL6.1989@news1.pds.libertysurf.fr...

I have the same problem with a Line 6 compressor not liking the PSU in my
BOSS pedalboard, so I bought a Behringher compressor which works fine.

The new PSU you have is probably a switch-mode PSU and its noise from that.
These are different to rectified transformer PSUs of old and I suspect the
quality of noise suppression is variable with them. It appears some pedals
are more sensitive than others.

If you are getting a buzzing rather than humming and its OK on battery then
its the PSU. Cant tell you which ones are better than others. Maybe get a
techie to make you a transformer based supply. Heavier and more bulk but
with a well made rectifier circuit it should not hum or buzz.

http://en.wikipedia.org/wiki/Switched-mode power supply

HTH

Andrew(lefty)

Actually, those old Ross PSUs were fantastic. I still have one here for
demanding applications. Good, solid, sadly bulky, reliable stuff.


Yes.

Even worse is the Behringer reverb pedal. Apparently ;-)

I play with a lot of pedals (current collection was 60 last time I
counted), and Ive found a few that are really seriously paranoid about
external PSUs. If you find something that works, stick with it.

Al.

On May 7, 2:24 pm, Roger Moss
wrote:



As Ive not got the same pedal set up as you I cant really offer much
direct experience, except to say that I had terrible problems with a
Behringer digital reverb pedal which was only solved when I bought a
psu from Johhnyshredfreak. This is the same PSU as the one used by
our tame chimp Mr Gomm. From what you describe Im confident that
the PSU is the weakness and its got nothing to do with the other
pedals youre using. I also bought a bunch of daisy chain leads
when I bought the PSU and my pedal board now works fine.

From my experience I do think that digital delays and digital reverbs
are really picky about being fed a diet of very smooth regulated
volts.

Try a PSU from johnnyshredfreak. Id tried loads of others, and spent
a load of money in the process, before I foud his. They really are
excellent. Shaped like a laptop PC PSU witha detachable lead (which I
like, YMMV) and it just works!

cheers

andrew s

Yep - I think Ill do just that, via mail-order tomorrow. Their plug-in
mains lead approach is another plus for me as Im based in France, so can
choose which lead I use according to whether Im here or in the UK.

Until that arrives Im going to revert to the Ross unit, which has served me
well with no problems, apart from looking a bit clunky.

Thanks all!

RM

Al wrote in message
news:Xns9A97D2EA8C174alnews67hotmailcom@130.133.1.4...

My Behringher reverb DR100 works Ok with the BOSS pedalboard PSU.

Andrew