Charles, Thank you for this very useful information ! My plan is to « clone » as close as possible the initial 10811 design, as it is well proven. Except changing the crystal and possibly use modern components if they bring any improvement, and adapting the « mass » to the crystal format and manufacturing it through 3D printing. Did anybody tried something similar ? Best, Gilles.
> Le 11 sept. 2019 à 22:05, Charles Steinmetz <[email protected]> a écrit : > > Didier wrote: > >> The LM208 is a single op-amp with low offset (<3mV) and low bias current. > > Even 3mV offset is verging on horrible for a "precision" opamp these days -- > it's hard to find any respectable opamp that doesn't do lots better. > > The secret sauce of the LMx08 series is the super-beta input pair, which > matches FET opamps for input current but also holds that low (room-temp) > input current over the full temperature range (the input current of FET > opamps generally rises by at least 10x to more than 1000x at warmer to hot > temperatures). > > There is no need for extraordinary measures -- there are a number of more > modern opamps specifically designed to upgrade LMx08 sockets. The OP77 is > one: > > <http://pdf.datasheetcatalog.com/datasheet/analogdevices/206654345OP77_c.pdf> > > The LT1012 and OP97 are two more. I've used both extensively, and finally > settled on the OP97 for this sort of application: > > <http://pdf.datasheetcatalog.com/datasheet/analogdevices/140679914OP97_d.pdf> > > Best regards, > > Charles > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
