-------- tim...@timeok.it writes: > A better C field generator is necessary and the LM399 remains a good > solution. It would be interesting to add > barometric pressure compensation.
I don't think I can fit that also :-) > Two types of setting could be used to adjust the C field, one with fixed high > stability resistors resistors that can be switched for the coarse and a > potentiometer for fine tuning in order > to mitigate its low temperature stability. already got that. > Excellent solution of two separate power supplies for the lamp and the > rest of the electronics but I have > doubts about the LM317. Since we already have the LM399 available for the > CField, why not use this reference > voltage already present on the board to drive two low noise regulators? That's precisely the plan, but I like the LM317 style short-circuit and thermal protection, so I will probably do it by setting the LM317 voltage with a voltage divider, and then drive the midpoint with an op-amp relative to the LM399 -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
