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Gizzorge
Silver Member
USA
245 Posts |
 Posted - 10/05/2007 : 17:09:42
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So I got a RC-2 this week. I have it on my board.
My board is powered by this:
http://www.pedalpad.com/Power-Pad-II-Pedal-Pad-Boards-Supply.htm
I don't have it daisy chained, it is powered directly off the Power Pad.
Well for some reason, I am hearing an high pitched electronic whine all of the time. It is more noticeable when i put a high gain pedal on like a DF-2, or a MD-2.
Any RC-2 users have this issue? I have to think it is a power issue, but I am not sure.
Any thoughts?
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Erik dP
Silver Member
Sweden
150 Posts |
Posted - 10/05/2007 : 17:38:59
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Hi
I got it too. I have concluded that the RC-2 itsef is quiet, but the current draw affects other pedals through the daisy chain. It is actually my FT-2 that generates a hi-pitch noice (pulsing when the RC-2 led flashes) from the RC-2. I guess that batteries in the FT-2 would solve the problem, or a separate daisy, but I havn't tried. |
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Gizzorge
Silver Member
USA
245 Posts |
Posted - 10/05/2007 : 17:51:11
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| Would a dedicated PSA adapter to the RC-2 solve the problem? |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/05/2007 : 18:27:09
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Hi Gizzorge, Erik dP & Guys
I'm sure the Power Pad II, is a great product & a lot of care has been
taken to prevent it from causing switching noise.
But I'll take an even bet that it's the Power supply.
I just went & read a bit about it,
It's a switching type power supply,
These supplies run at a very high switching frequency,
to minimize the size of the on-board transformer- which saves copper - which saves MONEY.
And if the switching frequency, is not filtered properly, this noise can leak into the audio path of your pedals/electronics.
It could also be that the switching frequency, is beating against the Crystal clock frequency of the Computer & digital IC's, inside the RC-2.
If the frequencies are close enough, then the SUM or the DIFFERENCE of the frequencies, or a loud harmonic,
could also manifest itself, as the high pitched tone that seems to be leaking into your signal path.
============= I'll try to simplify it ======================
When you combine 2 different frequencies, you get both the:
SUM = Freq 1 plus Freq 2
you also get the:
DIFFERENCE = Freq 1 minus Freq 2
Plus a whole bunch of overtones-harmonics.
================================================
My Eng. friends & myself, tend to stay clear of switching power supplies, in audio applications, for this very reason.
But I will admit, I have seem some really well engineered & designed SMP (Switched Mode Power Supply) - that have started to change my opinion. [ a bit ]
With a SMP you get a lot of bang for your buck, & a considerable reduction in weight, & efficiency.
To test this theory - try using a normal regulated PSA or transformer type power supply, or something similar
Or a PSA on the RC-2 & a battery in the other pedal/s.
if the problem goes away, then you can bet it's the switching power supply.
Theory - theory - theory
Hope this helps...
Regards Dr. Bob  |
Edited by - Dr. Bob on 10/05/2007 18:34:55 |
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Gizzorge
Silver Member
USA
245 Posts |
Posted - 10/05/2007 : 18:33:05
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Calling DR. Bob, stat!!!
Good ideas, I'll check into when i get home today.
The board was dead silent until, I put the RC-2 into the mix.
Thanks for the help sir!!! |
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Dr. Bob
Moderator
Australia
6593 Posts |
Posted - 10/05/2007 : 18:40:40
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Hi Gizzorge
Please keep be informed, about your findings.
I hope I was able to explain, that I was trying to say?
It's hear to teach theory, in 25 lines on a forum.
But I'll always try to help out where I can.
I have been considering, or maybe it's light GAS-ing for an RC-2
I have a line 6 DL4 with 14 & 28 seconds of loop memory,
& that's can be a heap of fun.
But to have 16 minutes.... 
They are over $300au over here... 
Regards Dr. Bob |
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StratoSphere
Double Platinum Member
Canada
2232 Posts |
Posted - 10/06/2007 : 00:10:44
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hmmm ive never noticed this before with mine. where do you guys place your RC-2s? i have mine dead last.
the only time ive ever had any high pitched whine was with a certian guitar i used to own when i would use the bridge pickup. try using a different guitar maybe. |
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shortpunks
Copper Member
USA
47 Posts |
Posted - 10/06/2007 : 06:12:27
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| I've always had to run my RC-2 with its own power supply, usually a Morley adapter which is basically their version of the Boss PSA. My PSA's always seem to short out on me, so the Morley's proven to be tougher, especially the power chord. I also got a high-pitched whine when I first tried my RC-2 with a daisy-chain, even when using my Visual Sound One-spot adapter. It also messed with my CE-3...hooked to the same daisy chain, the chorus made very strange gurgling noises when switched on. Once I put the RC-2 on its own power supply, the weird gurgling stopped, and so did the whine! I guess analog chorus pedals and digital loopers just don't get along with each other...! |
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stinkfoot
Silver Member
Sweden
181 Posts |
Posted - 10/07/2007 : 09:26:59
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It's definitely a power supply issue. The switching type supplies (1spot, Godlyke, Pedal Pad and a host of others) are notorious for causing that high-pitched whine in certain pedals, mostly digital and/or time-based (chorus, delay etc). Give the RC-2 its own (transformer-based) power supply - such as the Boss PSA - and the problem should go away.
/Andreas |
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Some Weird Sin
Bronze Member
Netherlands
73 Posts |
Posted - 10/07/2007 : 14:31:41
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I have mine dead last(after a long string of Daisy-chained pedals) and I have a Boss PSA just for the RC-2 and no problems whatsoever.
off topic: I cannot seem to insert any pics in my posts |
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Topic |
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High Pitched Whine--RC-2 Related
