From yahoo Sent Mon, Jun 18th 2018, 09:08
From yahoo Sent Mon, Jun 18th 2018, 09:08
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: xxxxxxx_xxxx@xxxxxxxxxxx.xxx [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > Gesendet: Samstag, 16. Juni 2018 10:30 > An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > 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, xxxxx@xxxxxxx.xx [Doepfer_a100] > <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> 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: xxxxxxx_xxxx@xxxxxxxxxxx.xxx [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > >> Gesendet: Dienstag, 12. Juni 2018 10:45 > >> An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > >> 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, xxxxx@xxxxxxx.xx [Doepfer_a100] > >> <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> 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: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > >> [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > >>>> Gesendet: Freitag, 1. Juni 2018 19:33 > >>>> An: xxxxx@xxxxxxx.xx [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 <xxxx@xxxxxx.xx.xx> > >> ------------------------------------ > >> > >> > >> ------------------------------------ > >> > >> Yahoo Groups Links > >> > >> > >> > > > > > > > > ------------------------------------ > > > > ------------------------------------ > > > > > > ------------------------------------ > > > > Yahoo Groups Links > > > > > > > > > ------------------------------------ > Posted by: John Hollis <xxxx@xxxxxx.xx.xx> > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Doepfer_a100/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Doepfer_a100/join (Yahoo! ID required) <*> To change settings via email: xxxxxxx_xxxx-xxxxxx@xxxxxxxxxxx.xxx xxxxxxx_xxxx-xxxxxxxxxxxx@xxxxxxxxxxx.xxx <*> To unsubscribe from this group, send an email to: xxxxxxx_xxxx-xxxxxxxxxxx@xxxxxxxxxxx.xxx <*> Your use of Yahoo Groups is subject to: https://info.yahoo.com/legal/us/yahoo/utos/terms/