Analogue systems

Hi Daniel,

I have an RS40 too that I use quite often and it's really precise and  
stable...
I'll keep monitoring my RS-200 and report anything strange.
Anyways, thank you for looking into this.

Cheers,

Z.

On 16 Oct 2011, at 00:30, lausome graylien Skevington wrote:

>
> I have an RS40 whose clock drifts quite a bit (I've also noticed  
> that it's sample and held output drifts upwards too). I suspect  
> it's the same clock circuit as the RS200 (same min and max  
> frequency, output levels). I haven't quite had the time to  
> investigate properly, but I did swap out the TL072  in the clock  
> circuit with no improvement. There are two 1u (or is it 2u2?) film  
> caps on there which I believe are the timing caps, so those were my  
> next port of call. I should really trace out the circuit so I can  
> fault find it properly. My RS40 is probably two years old, maybe  
> they had a batch of some particular part which is prone to failure.  
> Actually now I think of it, I believe the S&H circuit uses the same  
> type of cap for storing the sampled voltage so if they had a bad  
> batch maybe there is a connection between the two faults... I did  
> speak to Bob about it, he'd said he'd never heard of this  
> particular problem before but it seems likely that we have the same  
> issue. When I get t
>  o the bottom of it I'll let you know.
>
> Regards,
>
> Daniel.
>
> To: analogue_systems@yahoogroups.com
> From: coenen.olivier@skynet.be
> Date: Sat, 15 Oct 2011 14:42:02 +0000
> Subject: [analogue_systems] RS-200 CV & Clock drift
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>       Hello,
>
>
>
> I've noticed on several occasions that the clock of my RS-200 is  
> far from rock steady...
>
> Small but obvious speed variations appear from time to time, and it  
> has been doing this since I bought it new more than a year  
> ago...independent of whatever modules are plugged in the same RS-15  
> case (current consumption cannot be an issue with so few modules in  
> the case and all other modules do function properly).
>
>
>
> Also, during the past week, the CV outputs A, B and C produced some  
> seriously drifting CVs...
>
> This problem seems now to have disappeared or to be attenuated in a  
> way it is barely noticeable, for whatever reason... I don't know  
> why or how it appeared in the first place ?!
>
>
>
> Last year, during the very hot summer days, the sequencer stopped  
> running after some time...no way to get it running again but after  
> the modular was shut down for while...
>
> Perhaps some heat dissipation problem...I e-mailed Bob about it and  
> at the moment I decided to send it out for revision, it started  
> working properly again... just like it "felt" I was going to send  
> it out and it was afraid to undergo an "operation" :-)
>
>
>
> Anyone experiencing similar problems or is my module a monday  
> morning assembly ?
>
> Definitely a ghost in the machine...
>
>
>
> Thanks
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>    		 	   		
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>