Thanks Frank, much appreciated! Steve WB0DBS On Aug 20, 2013, at 4:27 PM, Frank Stellmach <frank.stellmach@freenet.de> wrote: > Steve, > > yep, it's in the LTZ100 thread. > We discussed intensively the sense or nonsense of those slots in the Datron PCB design, which is very often (blindly) copied by others... > > Mickle T. contributed the already known schematics and he measured all resistor values of the Vishay array. > > Then, quarks simply added a schematic of this array, which he received directly from Vishay, obviously. > > So, Datron used 21 Ohm in series with the Zener for better T.C. (originally 50ppm/K), 9k/659 as initial divider for temperature regulation (altered by the external temp. PWM), 128 Ohm for the Zener current, 39k as collector resistor for the reference transistor. > > There's no complete schematic yet, but now it's possible to finalize that. > > Here's the link: > > http://www.eevblog.com/forum/projects/ultra-precision-reference-ltz1000/300/ > > Frank > _______________________________________________ > volt-nuts mailing list -- volt-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there.