Hendrik Dietrich <[email protected]> writes: > Good morning fellow nuts, > > after a short planning and long wait times to get LTZ from china[1], PCB > from the Ruhr valley[2] and resistors from the UK[3], I was no longer > able to wait and slap everything together.
Hello Hendrik, Well done, I have been working on LTZ1000 circuits too, very intermittently unfortunately... > It is a clone of the Williams design in Linear Technology AN86 with > 2x25K in parallel as R4, as suggested by Dr. Frank Stellmach from this > maillist. The interesting resistors are General Resistance Econistors, > the zener plus is buffered with a further LT1013 before breakout with > 4mm copper-tellur receptacles[4]. Won't the buffer have too much drift and TC? In that same application note he uses chopper stabilized amplifiers for this. Hmm, LT1013 has guaranteed 2uV/K = 0.28ppm/K. But likely less than that, and you could compensate it by fiddling with the tempco resistor in the reference circuit. But what is the long term offset stability? "0.4uV/month". Or 0.05ppm, compared to roughly 0.3ppm/sqrt(month) for the LTZ1000. So should be fine if I did the sums right. And likely a lower noise contribution than the chopper amps I have been looking at. [...] -- John Devereux _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
