Bc2000 (for the BCF2000 & BCR2000)

Hi Robert

That's what I am investigating now.

My hunch is someone (including myself in some kit I just made) got the cable shield muddled with the earth grounding and hence somehow connect the two OR there is a lack of twisted pairs in some of my cables. Which could defeat the purpose of the opto-couplers :-(.

I am needing to re-configure my garage "studio", so will carefully test each piece in isolation. (Good time to also label up those cables and route them more carefully).

I recall one piece of audio kit I had (since resoldered, star grounded and shielded!) that was a USB soundcard connected thru to a cheap Fender copy guitar. If ever the USB was powered from a PC that was also mains powered, then the hum was intolerable -- run it off battery powered laptop and all is quiet.

Thanks for all the suggestions so far.

Regards

Steve H

--- In bc2000@yahoogroups.com, Robert Dorschel <rdorsche@...> wrote:
>
> There is +5V current in every MIDI cable.
> (which makes it no surprise that USB is generally also 5-volt rated, but that's another topic)
> So the hum can come from either the product, it's power adapter, or the MIDI signal itself. You never know.
> 
> 
> I think the power adapter for any Behringer product, or, the products themselves, are not properly grounded. But again, that's just my opinion.
> 
> 
> 
> 
> ________________________________
>  From: Bruno <brunorc@...>
> To: bc2000@yahoogroups.com 
> Sent: Tuesday, June 19, 2012 3:01 PM
> Subject: Re: [bc2000] Re: Noise from control movements
>  
> 
> Â  
> 2012/6/19  <sghookings@...>:
> > Does you mod wheel do this regardless of BCR in the loop?
> 
> I was referring to the "native" mod wheel of CS1x, as an example of
> "audible" MIDI events w/o the use of BCR.
> 
> > See for me the BCR has to be in the loop (he induces the noise) and interestingly it is only certain instruments that propagate it.
> 
> I don't get it - BCR itself doesn't have any audio output. Apart from
> some electrical issue (grounding?) I cannot find any explanation.
> 
> Bruno
>