Doepfer

Hello John,

thank you for the information. We have the LT1014 in stock and I'll try it
out.

Best wishes
Dieter Doepfer


> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> Gesendet: Samstag, 16. Juni 2018 10:30
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: [Doepfer_a100] A-156 input threshold tracking
>
>
> Hi Dieter,
>
> I decided to try it and used the LT1014DN with an offset of 60uV.
> I now have 8 channels of pitch quantisation that track well. I
> would suggest it to anyone using multiple A-156 quantisers.
>
> The limitation now appears to be the integrity of the patch
> cabling. If all the transpose input connections are clean the
> tracking is spot on.
>
> Best wishes
> John
>
> > On 12 Jun 2018, at 11:20, yahoo@doepfer.de [Doepfer_a100]
> <Doepfer_a100@yahoogroups.com> wrote:
> >
> > Yes, two of the opamps of the TLC274 are the input buffers. You
> may try it
> > out but from my point of view it would be more reasonable to
> add an offset
> > circuit (trimming potentiometer + resistor) than to try out to
> find another
> > opamp with a different offset.
> >
> > Best wishes
> > Dieter Doepfer
> >
> >
> >> -----Ursprüngliche Nachricht-----
> >> Von: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> >> Gesendet: Dienstag, 12. Juni 2018 10:45
> >> An: Doepfer_a100@yahoogroups.com
> >> Betreff: Re: [Doepfer_a100] A-156 input threshold tracking
> >>
> >>
> >> Hi Dieter,
> >>
> >> Thanks for your response. I have now had a chance to pull an
> >> A-156 out of the rack. From what I can see it looks like that
> >> TLC274 is the input buffer. If that chip has a 10mV offset I was
> >> wondering if it might be worth swapping out the TLC264 for
> >> something like an LT1014 (150uV offset).
> >>
> >> Do you think it’s worth trying or am I doomed to get the
> >> soldering iron out?
> >>
> >> Best wishes
> >> John
> >>
> >>> On 4 Jun 2018, at 09:47, yahoo@doepfer.de [Doepfer_a100]
> >> <Doepfer_a100@yahoogroups.com> wrote:
> >>>
> >>> Hello,
> >>>
> >>> unfortunately there is no offset trimming available at the
> >> A-156 module. P1,
> >>> P2 and P3 are just attenuators (with buffers) but do not
> offer an offset
> >>> feature. One would have to add an offset externally or modify
> >> the A-156 (by
> >>> adding trimming potentiometers and resistors for offset
> >> adjustment). I can
> >>> tell you details if required.
> >>>
> >>> Best wishes
> >>> Dieter Doepfer
> >>>
> >>>> -----Ursprungliche Nachricht-----
> >>>> Von: Doepfer_a100@yahoogroups.com
> >> [mailto:Doepfer_a100@yahoogroups.com]
> >>>> Gesendet: Freitag, 1. Juni 2018 19:33
> >>>> An: yahoo@doepfer.de [Doepfer_a100]
> >>>> Betreff: [Doepfer_a100] A-156 input threshold tracking
> >>>>
> >>>>
> >>>> Hi Dieter,
> >>>>
> >>>> I am using 4 x A-156 together. The input threshold tracking is
> >>>> usable but a bit tricky with one of the modules being slightly
> >>>> different. I have read the A-156 adjustment guide and have the
> >>>> correct tools to hand. I understand how P1, P2 and P3 adjust the
> >>>> input scale but would like to understand if recalibrating them
> >>>> might help with a little input offset. Any thoughts appreciated.
> >>>>
> >>>> Many thanks for your time and attention.
> >>>>
> >>>> Kind Regards,
> >>>>
> >>>> John Hollis
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >> ------------------------------------
> >> Posted by: John Hollis <john@hollis.co.uk>
> >> ------------------------------------
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> ------------------------------------
> Posted by: John Hollis <john@hollis.co.uk>
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