On 10/30/16 22:17, Poul-Henning Kamp wrote: > -------- > In message <[email protected]>, Christopher > Brown writes: > >> Could not find anything with really good specs so am currently thinking >> something like a Traco TDN 3-1213WI (200ma 15V) feeding a filter into a >> low noise linear reg to -10VDC followed by another filter. > > Look at their TVN 5WI instead ?
Hmm, twice the price but 80% less ripple, think I will try one. > > If you want _really_ low noise the TYL/TVL is there, but have restricted > input-range. Yes but only have ~ 13.6 to start, hate to linear it to 5 then step back to 9. Thinking filter/caps > TVN 5-2413WI > filter/caps > Fairchild LM7910CT With a 10uf tant on LM output, say 2ohm metal film then > 100uf oscon type. Likely in a small metal box with feedthrough caps. It it were not for the fact that three different subsystems depend on the -9 as a <0 pulldown (and they all tie together at some point) I would just switch the APC/ALC opamps to split-rail and switch from pulling Q4 G1 negative to pulling Q4 G2 from ~ 4V to 0. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
